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1Z0-432 - Oracle Real Application Clusters 12c Essentials - Dump Information

Vendor : Oracle
Exam Code : 1Z0-432
Exam Name : Oracle Real Application Clusters 12c Essentials
Questions and Answers : 85 Q & A
Updated On : December 7, 2018
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1Z0-432 Oracle Real Application Clusters 12c Essentials

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1Z0-432 exam Dumps Source : Oracle Real Application Clusters 12c Essentials

Test Code : 1Z0-432
Test Name : Oracle Real Application Clusters 12c Essentials
Vendor Name : Oracle
Q&A : 85 Real Questions

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Oracle Oracle Real Application Clusters

Oracle Database 12c liberate 2 precise utility Clusters handbook: ideas, Administration, Tuning & Troubleshooting | killexams.com Real Questions and Pass4sure dumps

Synopsis

grasp Oracle Database 12c liberate 2 real application Clusters with this complete, totally up to date guideNow that you would be able to maintain a dynamic commercial enterprise computing infrastructure with skilled instruction from an Oracle ACE. Oracle Database 12c unlock 2 real utility Clusters handbook: concepts, Administration, Tuning, and Troubleshooting has been wholly revised and up-to-date to cover the newest equipment and contours. learn how to put together your hardware, set up Oracle true application Clusters, and combine seamless failover insurance policy. Troubleshooting, efficiency tuning, and software building are also discussed in this complete Oracle Press ebook.*set up and configure Oracle Database 12c free up 2 precise software Clusters*Configure and control disk companies using Oracle automatic Storage administration*Work with functions, balloting disks, and Oracle Clusterware repository*Diagnose performance complications with Oracle Wait Interface*seem to be under the hood of Cache Fusion and world useful resource listing operations*explore the inner workings of backup and restoration in Oracle actual utility Clusters*make use of workload balancing and clear utility Failover*Troubleshoot Oracle Clusterware using superior diagnostics*strengthen customized Oracle actual utility Clusters applications

k. Gopalakrishnan (Gopal) is an award-winning coauthor ("Oracle author of the 12 months 2005"-Oracle journal) of Oracle Wait Interface (Oracle Press). He also authored Oracle Database 10g actual utility Clusters also from Oracle Press (Nov 2006). He has published articles in a lot of foreign Magazines and is identified as one of the leading database efficiency tuning specialists in the world. Oracle expertise network additionally acknowledges him as an Oracle ACE. Gopal has labored with a few of the biggest and busiest databases on the earth and has deep experience within the performance management and tuning of very large online transactional databases. Sam R. Alapati is an skilled Oracle DBA who holds the Oracle OCP DBA (11g) certification and the Hewlett-Packard UNIX gadget Administrator certification. He at the moment manages Oracle databases at the Boy Scouts of Americas national office in Irving, Texas. up to now, Sam labored for AMR Holdings (Sabre) and the Blanch company in Dallas. Sam turned into a Senior main consultant for Oracle organisation in big apple, wherein skill he worked at NBC and Lehman Brothers. in addition to being a professional Oracle database administrator, Sam has additionally taught Oracle DBA classes for a lot of students. Sam taught faculty stage lessons at Kansas State school, university of Texas at Austin, and Rutgers college.

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Oracle Clusterware and Oracle precise software Clusters | killexams.com Real Questions and Pass4sure dumps

This chapter introduces Oracle Clusterware and Oracle precise application Clusters (Oracle RAC) by way of describing these items as well as how to installation, administer, and installation them. This chapter describes Oracle Clusterware and Oracle RAC architectures as neatly because the software and hardware components for each of those items. This chapter also in brief describes workload management, functions, and excessive availability for each single-example Oracle databases and Oracle RAC environments. This chapter includes the following topics:

Oracle Clusterware and Oracle real utility Clusters

A cluster comprises distinct interconnected computer systems or servers that seem like they are one server to conclusion clients and purposes. Oracle Database 10g real software Clusters (Oracle RAC) makes it possible for the clustering of the Oracle Database. Oracle RAC uses Oracle Clusterware for the infrastructure to bind distinctive servers in order that they function as a single system.

Oracle Clusterware is a transportable cluster administration answer it truly is integrated with the Oracle database. The Oracle Clusterware is additionally a required element for the use of Oracle RAC. moreover, Oracle Clusterware enables each single-example Oracle databases and Oracle RAC databases to make use of the Oracle excessive availability infrastructure. The Oracle Clusterware makes it possible for you to create a clustered pool of storage to be used by way of any combination of single-illustration and Oracle RAC databases.

Oracle Clusterware is the best clusterware that you simply want for most systems on which Oracle RAC operates. you can also use clusterware from other companies if the clusterware is certified for Oracle RAC.

Single-illustration Oracle databases have a one-to-one relationship between the Oracle database and the instance. Oracle RAC environments, youngsters, have a one-to-many relationship between the database and instances. In Oracle RAC environments, the cluster database circumstances entry one database. The combined processing vigor of the multiple servers can provide stronger throughput and scalability than is purchasable from a single server. Oracle RAC is the Oracle Database option that provides a single device photograph for numerous servers to access one Oracle database. In Oracle RAC, each and every Oracle illustration constantly runs on a separate server.

Oracle RAC is a special know-how that offers excessive availability and scalability for all utility forms. The Oracle RAC infrastructure is additionally a key part for implementing the Oracle enterprise grid computing structure. Having varied instances entry a single database prevents the server from being a single element of failure. Oracle RAC allows you to combine smaller commodity servers into a cluster to create scalable environments that aid mission critical company applications. functions that you simply deploy on Oracle RAC databases can function with out code adjustments.

The Oracle Clusterware structure and Oracle Clusterware Processing

The Oracle Clusterware is application that after put in on servers working the identical operating equipment, enables the servers to be certain collectively to function as if they had been one server. The Oracle Clusterware requires two clusterware add-ons: a vote casting disk to checklist node membership assistance and the Oracle Cluster Registry (OCR) to listing cluster configuration guidance. The balloting disk and the OCR need to reside on shared storage. The Oracle Clusterware requires that each node be related to a personal community by means of a non-public interconnect.

The inner most interconnect that Oracle Clusterware requires is a separate community that you simply configure between the cluster nodes. This interconnect, which is required by means of Oracle RAC, can be the equal network that the clusterware uses, however the interconnect should still not be available by using nodes that don't seem to be a part of the cluster.

Oracle recommends that you simply configure a redundant interconnect to stay away from the interconnect from being a single factor of failure. Oracle also recommends that you simply use user Datagram Protocol (UDP) on a Gigabit Ethernet for your cluster interconnect. Crossover cables aren't supported for use with Oracle Clusterware or Oracle RAC databases.

The Oracle Clusterware manages node membership and prevents cut up mind syndrome through which two or greater cases try and handle the database. this can ensue in instances where there's a wreck in verbal exchange between nodes during the interconnect.

The Oracle Clusterware architecture helps high availability by means of immediately restarting stopped add-ons. The Oracle Clusterware can immediately re-start a node to keep away from complications with that node from affecting the availability of the relaxation of the Oracle RAC ambiance. In an Oracle RAC atmosphere, all Oracle processes are beneath the handle of the Oracle clusterware. The Oracle Clusterware additionally gives an software programming interface (API) that makes it possible for you to control different Oracle methods with Oracle Clusterware.

Oracle Clusterware utility part Processing details

The Oracle Clusterware comprises a few historical past processes that facilitate cluster operations. The Cluster Synchronization carrier (CSS), adventure administration (EVM), and Oracle Cluster components communicate with different cluster part layers within the different instances within the equal cluster database ambiance. These accessories are additionally the main communication links between the Oracle Clusterware high availability components and the Oracle Database. in addition, these add-ons monitor and manage database operations.

the following listing describes the features of one of the primary Oracle Clusterware add-ons. This record includes these add-ons which are processes on Unix and Linux working techniques or functions on home windows.

note:

On windows-based working methods, lots of the accessories are threads of the Oracle process as a substitute of separate tactics.
  • Cluster Synchronization features (CSS)—Manages the cluster configuration by using controlling which nodes are members of the cluster and via notifying contributors when a node joins or leaves the cluster. if you are the use of third-party clusterware, then the css procedure interfaces with your clusterware to manipulate node membership assistance.

  • Cluster able capabilities (CRS)—The primary software for managing excessive availability operations within a cluster. the rest that the crs method manages is known as a cluster resource which is usually a database, an instance, a carrier, a Listener, a virtual IP (VIP) tackle, an software procedure, and so forth. The crs method manages cluster components in response to the aid's configuration information it really is saved in the OCR. This contains birth, stop, computer screen and failover operations. The crs method generates routine when a resource reputation alterations. you probably have put in Oracle RAC, crs displays the Oracle illustration, Listener, and the like, and instantly restarts these add-ons when a failure occurs. by default, the crs technique makes 5 attempts to restart a useful resource and then doesn't make additional restart attempts if the resource doesn't restart.

  • experience administration (EVM)—A background method that publishes movements that crs creates.

  • Oracle Notification service (ONS)—A publish and subscribe service for speaking fast application Notification (FAN) movements.

  • RACG—Extends clusterware to guide Oracle-specific requirements and complicated components. Runs server callout scripts when FAN movements take place.

  • technique monitor Daemon (OPROCD)—This technique is locked in memory to video display the cluster and provide I/O fencing. OPROCD performs its assess, stops running, and if the awaken is past the anticipated time, then OPROCD resets the processor and reboots the node. An OPROCD failure results in Oracle Clusterware restarting the node. OPROCD uses the hangcheck timer on Linux structures.

  • In the following table, if a procedure has a (r) beside it, then the technique runs as the root user. otherwise the process runs as the oracle consumer.

    desk 1-1 record of procedures and windows functions linked to Oracle Clusterware

    Oracle Clusterware component Linux/Unix system home windows servicesWindows processes

    technique monitor Daemon

    oprocd (r)

    OraFenceService

    RACG

    racgmain, racgimon

    racgmain.exe racgimon.exe

    Oracle Notification carrier (ONS)

    ons

    ons.exe

    adventure supervisor

    evmd (r), evmd.bin, evmlogger

    OracleEVMService

    evmlogger.exe, evmd.exe

    Cluster equipped

    crsd.bin (r)

    OracleCRSService

    crsd.exe

    Cluster Synchronization services

    init.cssd (r), ocssd (r), ocssd.bin

    OracleCSService

    ocssd.exe

    The Oracle Clusterware utility components

    When Oracle Clusterware operates, a few platform-selected approaches or capabilities will also be working on each node in the cluster to aid Oracle Clusterware. The Oracle Clusterware platform-selected UNIX-based mostly strategies and home windows-based mostly services are described under the following headings:

    Oracle Clusterware techniques on UNIX-based techniques

    The Oracle Clusterware processes on UNIX-based methods are:

  • crsd—Performs excessive availability restoration and management operations such as protecting the OCR and managing utility resources. This technique runs as the root person, or by means of a user in the admin community on Mac OS X-based techniques. This technique restarts instantly upon failure.

  • evmd—experience supervisor daemon. This manner additionally starts the racgevt method to manipulate FAN server callouts.

  • ocssd—Manages cluster node membership and runs as the oracle person; failure of this technique results in cluster restart.

  • oprocd—procedure video display for the cluster. notice that this method only seems on systems that do not use vendor clusterware with Oracle Clusterware.

  • notice:

    Oracle RAC on Linux platforms can have dissimilar threads that appear as separate tactics with separate technique identifiers. Oracle Clusterware features on windows-based mostly techniques

    The Oracle Clusterware capabilities on home windows-based programs are:

  • OracleCRService—Performs high availability healing and administration operations comparable to keeping the OCR and managing application substances. This method runs because the root user, or through a user in the admin neighborhood on Mac OS X-based mostly programs. This manner restarts instantly upon failure.

  • OracleCSService—Manages cluster node membership and runs as oracle user; failure of this process results in cluster restart.

  • OracleEVMService—adventure manager daemon. This manner additionally starts the racgevt method to manage FAN server callouts.

  • OraFenceService—system display screen for the cluster. observe that this system most effective appears on systems that do not use vendor clusterware with Oracle Clusterware.

  • The Oracle precise application Clusters architecture and Oracle real application Clusters Processing

    An Oracle RAC database is a logically or physically shared everything database. All datafiles, manage files, PFILEs, and redo log files in Oracle RAC environments have to reside on cluster-mindful shared disks in order that all the cluster database circumstances can entry them. the entire situations must also share the same interconnect. furthermore, Oracle RAC databases can share the identical interconnect that Oracle Clusterware uses.

    as a result of an Oracle RAC database makes use of a shared every little thing structure, Oracle RAC requires cluster-aware storage for all database information. it's your option as to a way to configure your disk, however you must use a supported cluster-mindful storage solution. Oracle Database 10g offers automated Storage management (ASM), which is the advised solution to manipulate your disk. although you might also additionally use a cluster-conscious volume manager or a cluster file equipment (now not required). In Oracle RAC, the Oracle Database software manages disk entry and the Oracle software is certified to be used on quite a lot of storage architectures. An Oracle RAC database can have as much as one hundred situations. counting on your platform, that you could use here file storage options for Oracle RAC:

  • ASM, which Oracle recommends

  • Oracle Cluster File device (OCFS), which is obtainable for Linux and windows platforms, or a third-celebration cluster file equipment this is certified for Oracle RAC

  • A network file equipment

  • uncooked devices

  • Oracle RAC databases vary architecturally from Oracle RACsingle-example Oracle databases in that each and every Oracle RAC database illustration also has:

    All nodes in an Oracle RAC ambiance ought to connect with a local area network (LAN) to permit users and applications to access the database. functions should use the Oracle Database functions feature to hook up with an Oracle database. features permit you to outline guidelines and traits to control how users and applications hook up with database situations. These features encompass a different identify, workload balancing and failover alternatives, and high availability characteristics. Oracle internet functions permits the load balancing of application connections across all of the situations in an Oracle RAC database.

    users can entry an Oracle RAC database using a client-server configuration or through one or more center tiers, with or devoid of connection pooling. clients can be DBAs, developers, utility clients, energy users, akin to records miners who create their own searches, and the like.

    Most public networks typically use TCP/IP, however that you could use any supported hardware and utility mixture. Oracle RAC database cases may also be accessed through a database's described, default IP address and thru VIP addresses.

    notice:

    don't to use the interconnect or the deepest network for user verbal exchange as a result of Cache Fusion makes use of the deepest interconnect for inter-example communications.

    besides the node's host identify and IP handle, you must additionally assign a digital host name and an IP tackle to each node. The digital host name or VIP should still be used to connect with the database instance. as an instance, you may enter the virtual host name CRM in the tackle list of the tnsnames.ora file.

    A virtual IP handle is an alternative public tackle that customer connections use in its place of the ordinary public IP handle. To configure VIP addresses, you deserve to reserve a spare IP handle for every node that makes use of the same subnet as the public network.

    If a node fails, then the node's VIP fails over to one more node on which the VIP cannot settle for connections. commonly, VIPs fail over when the node on which a VIP runs fails or if all interfaces for the VIP fail or are disconnected from the network. purchasers that try to hook up with the VIP acquire a fast connection refused error as an alternative of looking ahead to TCP connect timeout messages. You configure VIP addresses within the address checklist to your database connection definition to permit connectivity. here area describes the Oracle RAC application components in additional detail.

    The Oracle true software Clusters software add-ons

    Oracle RAC databases have two or greater database cases that every contain memory buildings and history approaches. An Oracle RAC database has the identical techniques and memory structures as a single-instance Oracle database in addition to additional method and memory buildings which are particular to Oracle RAC. any one illustration's database view is virtually similar to some other illustration's view inside the equal Oracle RAC database; the view is a single gadget photograph of the ambiance.

    every illustration has a buffer cache in its device global area (SGA). the usage of Cache Fusion, Oracle RAC environments logically mix every example's buffer cache to allow the instances to process data as if the information resided on a logically combined, single cache.

    word:

    The SGA size necessities for Oracle RAC are more advantageous than the SGA requirements for single-illustration Oracle databases as a result of Cache Fusion.

    To ensure that each and every Oracle RAC database illustration obtains the block that it should fulfill a question or transaction, Oracle RAC circumstances use two methods, the international Cache service (GCS) and the world Enqueue carrier (GES). The GCS and GES hold facts of the statuses of each statistics file and each cached block the usage of a world resource directory (GRD). The GRD contents are allotted throughout all of the active situations, which with ease increases the measurement of the device global enviornment for an Oracle RAC illustration.

    After one illustration caches records, another instance in the same cluster database can purchase a block picture from one other example in the equal database sooner than by means of studying the block from disk. therefore, Cache Fusion moves present blocks between circumstances in preference to re-studying the blocks from disk. When a constant block is needed or a modified block is required on another illustration, Cache Fusion transfers the block photograph without delay between the affected cases. Oracle RAC uses the deepest interconnect for inter-example conversation and block transfers. The global Enqueue provider monitor and the instance Enqueue procedure manages entry to Cache Fusion components in addition to enqueue restoration processing.

    These Oracle RAC processes and the GRD collaborate to enable Cache Fusion. The Oracle RAC tactics and their identifiers are as follows:

  • LMS—global Cache carrier method

  • LMD—world Enqueue provider Daemon

  • LMON—world Enqueue carrier computer screen

  • LCK0—instance Enqueue procedure

  • in case you use network connected Storage (NAS), you then are required to configure a 2d deepest community. entry to this community is customarily managed with the aid of the dealer's software. The inner most community uses static IP addresses.

    note:

    most of the Oracle components that this section describes are apart from the accessories that are described for single-example Oracle databases in Oracle Database ideas. Oracle Clusterware accessories and high Availability

    in the event you mix Oracle Clusterware and Oracle RAC, you can achieve mind-blowing scalability and excessive availability. The Oracle Clusterware achieves this the use of the add-ons that this part describes under right here issues:

    The Oracle Clusterware balloting Disk and Oracle Cluster Registry

    The Oracle Clusterware requires the following two essential information:

  • vote casting Disk—Manages cluster membership by the use of a fitness verify and arbitrates cluster ownership among the many instances in case of network disasters. Oracle RAC uses the vote casting disk to verify which circumstances are contributors of a cluster. The balloting disk must stay on shared disk. for top availability, Oracle recommends that you have diverse voting disks. The Oracle Clusterware permits varied balloting disks however you should have an unusual number of vote casting disks, reminiscent of three, 5, etc. in case you outline a single vote casting disk, then remember to use external mirroring to supply redundancy.

  • Oracle Cluster Registry (OCR)—continues cluster configuration suggestions in addition to configuration suggestions about any cluster database inside the cluster. The OCR also manages suggestions about tactics that Oracle Clusterware controls. The OCR shops configuration counsel in a sequence of key-cost pairs inside a directory tree structure. The OCR should reside on shared disk that's obtainable by way of all the nodes to your cluster. The Oracle Clusterware can multiplex the OCR and Oracle recommends that you simply use this function to be certain cluster high availability. you could exchange a failed OCR online, and you may update the OCR through supported APIs such as commercial enterprise manager, the Server control Utility (SRVCTL), or the Database Configuration Assistant (DBCA).

  • notice:

    both the vote casting disks and the OCRs ought to dwell on both cluster file equipment files or on shared raw contraptions that you simply configure before you install Oracle Clusterware and Oracle RAC. Oracle Clusterware excessive Availability and the application Programming Interface

    Oracle Clusterware offers a excessive availability software programming interface (API) that you should use to allow Oracle Clusterware to manage functions or processes that run a cluster. This enables you to deliver high availability for all of your applications. The Oracle Clusterware with ASM allows for you to create a consolidated pool of storage to help each the one-illustration Oracle databases and the Oracle RAC databases which are running in your cluster.

    To maintain excessive availability, Oracle Clusterware add-ons can respond to fame alterations to restart applications and processes in response to described excessive availability guidelines. in addition, you can use the Oracle Clusterware high availability framework through registering your applications with Oracle Clusterware and configuring the clusterware to beginning, cease, or relocate your software techniques. that's, you could make custom functions incredibly accessible through the use of Oracle Clusterware to create profiles that monitor, relocate, and restart your applications. The Oracle Clusterware responds to FAN movements that are created by means of an Oracle RAC database. Oracle proclaims FAN events when cluster servers may also become unreachable and community interfaces are sluggish or non-purposeful.

    Workload administration with Oracle true application Clusters

    Workload administration allows you to manage the distribution of workloads to give most effective efficiency for clients and purposes. This includes presenting the highest availability for database connections, swift failure restoration, and balancing workloads optimally across the active configuration. Oracle Database 10g with Oracle RAC contains many aspects that may raise workload management akin to connection load balancing, quickly connection failover (FCF), the weight balancing advisory, and Runtime Connection Load Balancing. Workload management offers the gold standard merits to Oracle RAC environments. which you could, youngsters, take knowledge of workload administration by using Oracle functions in single-example Oracle Databases, peculiarly those that use data protect or Streams. Workload management includes here add-ons:

  • excessive Availability Framework—The Oracle RAC excessive availability framework enables the Oracle Database to keep accessories in a working state normally. Oracle high availability implies that Oracle Clusterware monitors and restarts crucial components if they cease, until you override the restart processing. The Oracle Clusterware and Oracle RAC also provide indicators to consumers when configurations change. This makes it possible for valued clientele to immediately react to the alterations, enabling utility builders to cover outages and reconfigurations from end clients. The scope of Oracle excessive availability spans from the restarting of stopped Oracle tactics in an Oracle database instance to failing over the processing of a complete instance to other purchasable instances.

  • Load Balancing Advisory—this is the capability of the database to supply information to applications in regards to the current carrier stages being offered by using the database and its situations. functions can take advantage of this counsel to direct connection requests to the instance so as to deliver the software request with the highest quality carrier pleasant to comprehensive the application's processing. Oracle has built-in its Java Database Connectivity (JDBC) and Oracle information company for .net (ODP.web) connection swimming pools to work with the burden balancing counsel. functions can use the integrated connection pools without programmatic alterations.

  • services—Oracle Database 10g introduces an impressive automatic workload management facility, referred to as services, to enable the enterprise grid vision. features are entities for you to outline in Oracle RAC databases. features allow you to community database workloads and route the work to the most effective cases which are assigned to process the service. moreover, you can use features to define the materials that Oracle assigns to technique workloads and to display screen workload materials. purposes that you simply assign to features transparently acquire the described workload administration qualities, including excessive availability and cargo balancing suggestions. Many Oracle database facets are built-in with services, similar to useful resource manager, which allows you to prevent the materials that a service can use within an example. Some database facets are also built-in with Oracle Streams, advanced Queuing, to achieve queue place transparency, and the Oracle Scheduler, to map services to particular job classes.

    In Oracle RAC databases, the provider efficiency suggestions that you simply configure control the amount of labor that Oracle allocates to each and every attainable illustration for that service. As you lengthen your database through adding nodes, applications, accessories of functions, and the like, that you can add greater features.

  • Connection Load Balancing— Oracle net services gives connection load balancing for database connections. Connection load balancing occurs when the connection is created. Connections for a given service are balanced throughout all the working instances that present the provider. be sure you define how you want connections to be balanced in the provider definition. although, you ought to still configure Oracle web capabilities. when you permit the weight balancing advisory, the Listener makes use of the weight balancing advisory for connection load balancing.

  • Introduction to installation Oracle Clusterware and Oracle actual application Clusters

    This part introduces the storage options for Oracle RAC and the installing methods for both Oracle Clusterware and Oracle RAC below here themes:

    Oracle Clusterware installation system Description

    The Oracle Clusterware is distributed on the Oracle Database 10g installation media. The Oracle widespread Installer (OUI) installs Oracle Clusterware right into a directory constitution, which may also be called CRS_home, it really is break free different Oracle application running on the desktop. because Oracle Clusterware works intently with the working system, device administrator entry is required for some of the installation tasks. furthermore, one of the crucial Oracle Clusterware procedures must run as the system administrator, which is commonly the foundation consumer on Unix and Linux programs and the device Administrator person on windows systems.

    prior to installing Oracle Clusterware, Oracle recommends that you just run the Cluster Verification Utility (CVU) to be sure that your atmosphere meets the Oracle Clusterware installing requirements. The OUI additionally automatically runs CVU at the end of the clusterware installation to check numerous clusterware components. The CVU simplifies the setting up, configuration, and standard administration of the Oracle Clusterware installing process by way of selecting complications in cluster environments.

    right through the Oracle Clusterware setting up, you have to identify three IP addresses for every node that is going to be part of your installing. One IP handle is for the private interconnect and the other is for the general public interconnect. The third IP handle is the digital IP address that customers will use to hook up with each and every illustration.

    The Oracle Clusterware installing process creates the voting disk and OCR on cluster-mindful storage. in case you select the option for usual redundant copies all through the installing system, then Oracle Clusterware instantly continues redundant copies of those info to keep away from the information from fitting single aspects of failure. The standard redundancy characteristic also eliminates the need for third party storage redundancy solutions. in case you use average redundancy, Oracle Clusterware immediately continues two copies of the Oracle Cluster Registry (OCR) file and three copies of the voting Disk file.

    word:

    in case you select external redundancy for the OCR and vote casting disk, then to allow redundancy, your disk subsystem need to be configurable for RAID mirroring. otherwise, your gadget may well be vulnerable since the OCR and balloting disk are single features of failure. Oracle precise software Clusters installing and Database introduction technique Description

    The Oracle RAC software is distributed as a part of the Oracle Database 10g setting up media. by default, the usual Oracle Database 10g software setting up procedure installs the Oracle RAC choice when it recognizes that you are performing the installing on a cluster. The OUI installs Oracle RAC right into a directory structure, which can be known as Oracle_home, this is break free other Oracle utility running on the computer. because OUI is cluster-aware, it installs the Oracle RAC software on the entire nodes that you defined to be part of the cluster. if you are the use of an authorized cluster file equipment for the Oracle home, then most effective select the node that you're linked to for the installation.

    You should first installation Oracle Clusterware before installation Oracle RAC. After Oracle Clusterware is operational, that you could use OUI to install the Oracle database software with the Oracle RAC accessories. all over the setting up, OUI runs DBCA to create your Oracle RAC database in accordance with the options that you simply opt for. The DBCA additionally runs the internet Configuration Assistant (NETCA) to configure the network in your Oracle RAC environment.

    Oracle recommends that you simply select ASM during the installing to simplify storage administration; ASM automatically manages the storage of all database information inside disk corporations. that you can also configure capabilities all the way through installation, reckoning on your processing requirements. when you are the use of the Oracle Database 10g commonplace version, then you definately need to use ASM for storing all of the database data.

    by way of default, DBCA creates one service for your ambiance and this carrier is for the database. The default provider is available on all circumstances in an Oracle RAC ambiance, except the database is in restricted mode.

    Cloning Oracle Clusterware and Oracle RAC software in Grid Environments

    This part briefly summarizes the procedures for deploying Oracle RAC in grid environments that have colossal numbers of nodes the usage of cloned photographs for Oracle Clusterware and Oracle RAC. Oracle cloning is the favored formula of extending your Oracle RAC ambiance with the aid of adding nodes and situations. To perform the cloning strategies that are summarized in this section, refer to the Oracle usual Installer and OPatch person's e-book.that you can also use commercial enterprise manager Grid handle to function cloning.

    The cloning process assumes that you just effectively put in an Oracle Clusterware domestic and an Oracle domestic with Oracle RAC on at the least one node. moreover, all root scripts must have run correctly on the node from which you're extending your cluster database. to make use of Oracle cloning, first clone the Oracle Clusterware home and then clone the Oracle domestic with the Oracle RAC software.

    To clone the Oracle Clusterware home, on UNIX-based methods create a tar file of the Oracle Clusterware domestic and copy the file to the brand new node's Oracle Clusterware home. On home windows-based mostly systems you must create zip files. Then on UNIX-based mostly methods create the mandatory users and corporations on the brand new nodes. On windows-based mostly methods, you don't should create users and groups, but the consumer that performs the cloning should be the same person that carried out the installation.

    Extract the tar file, or unzip the zip file, and run the Oracle established Installer (OUI) in clone mode as described in the Oracle conventional Installer and OPatch person's e book. Then run the setting up scripts and repeat these steps on each node that you are including. The method for cloning the Oracle home onto new nodes is similar to the procedure for cloning the Oracle Clusterware domestic. furthermore, you need to run the Oracle internet Configuration Assistant (NETCA) on each new node to create a Listener.

    in case you have not already created a database, then you could run the Database Configuration Assistant (DBCA) to create one. at last, observe the post-cloning approaches to finished the extension of your Oracle RAC ambiance onto the new nodes.

    further concerns and lines for Oracle precise utility Clusters

    apart from configuring features to control your workloads, also trust the usage of right here points if you deploy Oracle RAC:

  • Scaling Your Oracle RAC Database—As outlined, you can add nodes and cases to your Oracle RAC environment the use of Oracle cloning. if you choose to now not use cloning, then which you could lengthen your database through the use of the guide techniques which are described in Chapter 10, "adding and Deleting Nodes and instances on UNIX-based mostly methods" or Chapter 11, " including and Deleting Nodes and cases on home windows-based techniques".

  • business supervisor—Use business manager to administer your total Oracle RAC atmosphere, not simply the Oracle RAC database. Use commercial enterprise manager to create and regulate functions, and to beginning and prevent the cluster database situations and the cluster database. commercial enterprise manager has further features as distinct within the area "Overview of the use of enterprise manager with Oracle real software Clusters".

  • recovery manager (RMAN)—RMAN backs up, restores, and recovers datafiles, control information, server parameter information (SPFILEs) and archived redo logs. that you can use RMAN with a media supervisor to returned up information to external storage. which you could additionally configure parallelism when backing up or recuperating Oracle RAC databases. In Oracle RAC, RMAN channels can also be dynamically allocated across all of the Oracle RAC circumstances. Channel failover permits failed operations on one node to proceed on another node. that you can use RMAN in Oracle RAC from the Oracle enterprise manager Backup supervisor or from a command line.

  • automatic undo management—automatically manages undo processing.

  • automated phase space administration (ASSM)—instantly manages section freelists and freelist agencies.

  • in the community managed tablespaces—Enhances space administration performance.

  • Cluster Verification Utility (CVU)—Use CVU to examine the fame of your clusterware if you experience issues or use it each time you reconfigure your cluster.

  • Sequences—if you use sequence numbers, then always use CACHE with the NOORDER option for ultimate sequence number generation efficiency. With the CACHE option, although, you may also have gaps in the sequence numbers. if your environment cannot tolerate sequence quantity gaps, then use the NOCACHE choice or trust pre-generating the sequence numbers. if your software requires sequence quantity ordering but can tolerate gaps, then use CACHE and ORDER to cache and order sequence numbers in Oracle RAC. in case your application requires ordered sequence numbers with out gaps, then use NOCACHE and ORDER. This aggregate has probably the most negative effect on efficiency in comparison to other caching and ordering combinations.

  • Indexes—if you use indexes, accept as true with options, corresponding to reverse key indexes, to optimize index performance. Reverse key indexes are specifically helpful when you have generic inserts to at least one side of an index, reminiscent of indexes that are in keeping with insert date.

  • Managing Oracle true utility Clusters Environments

    This section describes the following Oracle RAC environment management issues:

    Designing Oracle real software Clusters Environments

    agree with performing the following steps all through the design and development of applications that you are deploying on an Oracle RAC database. agree with tuning:

  • The design and the utility

  • The memory and that i/O

  • competition

  • The working equipment

  • be aware:

    If an utility does not scale on an SMP computing device, then moving the application to an Oracle RAC database cannot enhance performance.

    accept as true with the usage of hash partitioning for insert-intensive on-line transaction processing (OLTP) functions. Hash partitioning:

  • Reduces rivalry on concurrent inserts into a single database constitution

  • impacts sequence-based indexes when indexes are in the community partitioned with a desk and tables are partitioned on sequence-based keys

  • Is clear to the software

  • if you hash partitioned tables and indexes for OLTP environments, then that you could enormously enrich efficiency on your Oracle RAC database. note that you simply can't use index range scans on an index with hash partitioning.

    if you are the use of sequence numbers, then always use the CACHE option. if you use sequence numbers with the CACHE choice, then:

    Administrative tools for Oracle real software Clusters Environments

    Oracle makes it possible for you to administer a cluster database as a single system photograph via enterprise supervisor, SQL*Plus, or via Oracle RAC command-line interfaces akin to Server handle (SRVCTL). that you may also use a couple of tools and utilities to control your Oracle RAC atmosphere and its add-ons as follows:

  • business supervisor—commercial enterprise manager has both the Database control and Grid handle GUI interfaces for managing each single instance and Oracle RAC environments.

  • Cluster Verification Utility (CVU)—CVU is a command-line device that you can use to verify a range of cluster and Oracle RAC-selected components akin to shared storage gadgets, networking configurations, gadget requirements, and Oracle Clusterware, as well as working gadget agencies and clients. that you would be able to use CVU for pre-setting up assessments in addition to for publish-setting up exams of your cluster atmosphere. CVU is chiefly helpful throughout pre-setting up and during setting up of Oracle Clusterware and Oracle RAC accessories. The OUI runs CVU after Oracle Clusterware and the Oracle installing to determine your ambiance.

  • Server handle (SRVCTL)—SRVCTL is a command-line interface so that you can use to manipulate an Oracle RAC database from a single factor. that you could use SRVCTL to birth and forestall the database and situations and to delete or stream circumstances and services. which you could additionally use SRVCTL to control configuration suggestions.

    See additionally:

    Appendix E for more suggestions about SRVCTL
  • Cluster capable functions manage (CRSCTL)—CRSCTL is a command-line device so you might use to control Oracle Clusterware. which you can use CRSCTL to birth and forestall Oracle Clusterware. CRSCTL has many options similar to enabling online debugging,

  • Oracle Interface Configuration device (OIFCFG)—OIFCFG is a command-line device for both single-instance Oracle databases and Oracle RAC environments so you might use to allocate and de-allocate network interfaces to add-ons. you could also use OIFCFG to direct components to use particular community interfaces and to retrieve part configuration tips.

  • OCR Configuration tool (OCRCONFIG)—OCRCONFIG is a command-line device for OCR administration. which you could also use the OCRCHECK and OCRDUMP utilities to troubleshoot configuration issues that have an effect on the OCR.

  • Monitoring Oracle true software Clusters Environments

    internet-based mostly business supervisor Database control and Grid control enable you to computer screen an Oracle RAC database. The commercial enterprise manager Console is a important aspect of manage for the Oracle ambiance that you simply access by way of a graphical person interface (GUI). Use the commercial enterprise manager Console to initiate cluster database administration initiatives. Use commercial enterprise manager Grid handle to administer numerous Oracle RAC databases. also word here elements about monitoring Oracle RAC environments:

  • The international views, or GV$ views, are in keeping with V$ views. The catclustdb.sql script creates the GV$ views. Run this script if you do not create your database with DBCA. in any other case, DBCA runs this script for you.

  • Statspack is Oracle RAC-mindful.

    be aware:

    as a substitute of the use of Statspak, Oracle recommends that you use the more sophisticated management and monitoring features of the Oracle Database 10g Diagnostic and Tuning packs which include the computerized Database Diagnostic display screen (ADDM).
  • Evaluating performance in Oracle actual utility Clusters Environments

    You do not deserve to function special tuning for Oracle RAC; Oracle RAC scales devoid of special configuration changes. if your utility carried out well on a single-instance Oracle database, then it'll perform well in an Oracle RAC ambiance. lots of the tuning tasks that you would function on a single-illustration Oracle database can also enrich Oracle RAC database performance. this is very true in case your environment required scalability across a superior number of CPUs.

    one of the most Oracle RAC efficiency points are:

  • Dynamic resource Allocation

  • Cache Fusion allows A Simplified Tuning Methodology

  • You would not have to tune any parameters for Cache Fusion

  • No application-degree tuning is imperative

  • that you may use a backside-up tuning approach with basically no impact in your existing functions

  • more targeted efficiency statistics


  • New Oracle VM Templates for Oracle true software Clusters Now accessible | killexams.com Real Questions and Pass4sure dumps

    REDWOOD SHORES, CA--(Marketwire - eleven/15/10) - Oracle (NASDAQ:ORCL - information)news records

  • Enabling clients to rapidly install a enormously purchasable, virtualized database, Oracle these days introduced the supply of latest Oracle VM Templates for Oracle Database 11g release 2 and Oracle real utility Clusters.
  • by using proposing pre-put in and pre-configured application images, Oracle VM Templates provide an innovative strategy to deploying a totally configured utility stack and enable digital and cloud environments to be provisioned immediately, with no trouble, continually, and with simplified management.
  • the brand new Oracle VM Templates for Oracle true application Clusters provide a fast and straightforward option to set up a database cluster on Oracle VM for building, check and production environments. Clusters of any number of nodes can also be constructed, and the whole installation is automated, requesting minimal counsel from the user when guests are booted.
  • Combining the merits of Oracle VM for x86 and Oracle true application Clusters offers a tremendously available database cloud solution with all the merits of a completely virtualized atmosphere.
  • the brand new Oracle VM Templates are available in 32-bit or sixty four-bit equipment formats.
  • wonderful combination of Virtualization and Clustering Speeds Time to Market and allows for bigger Availability

  • Use of Oracle VM Templates enormously simplifies installation and configuration, helping cut back preliminary and ongoing upkeep charges and allowing corporations to achieve faster time to market and reduce charge of operations.
  • via deploying Oracle true software Clusters in Oracle VM environments with the brand new templates, customers can benefit from better database availability.
  • The combination of Oracle VM and Oracle true application Clusters permits continuous availability within the face of hardware and software disasters, a good deal bigger availability than would traditionally be bought via hypervisor-only solutions from vendors like VMware, that could simplest move and restart failed digital machines.
  • Oracle VM Templates are additionally accessible for Oracle applications, Oracle Fusion Middleware, Oracle Database, Oracle Linux, Oracle Solaris and other Oracle items.
  • helping Quote

  • "only Oracle offers the unique aggregate of clustering and virtualization," said Wim Coekaerts, senior vp, Linux and Virtualization Engineering, Oracle. "using an Oracle VM infrastructure combined with the performance, scalability and resiliency of Oracle precise application Clusters and Oracle VM Templates, we assist consumers significantly in the reduction of deployment and operational costs while enabling a tremendously accessible infrastructure."
  • helping materials

    About Oracle Oracle (NASDAQ:ORCL - news) is the realm's most comprehensive, open, and integrated company software and hardware systems company. For more guidance about Oracle, please talk over with our internet website at http://www.oracle.com.trademarks Oracle and Java are registered emblems of Oracle and/or its affiliates. other names could be emblems of their respective homeowners.


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    Oracle bids for top toolmaker slot with WebLogic 12c | killexams.com real questions and Pass4sure dumps

    Oracle today released version 12c of WebLogic Server, the webserver which underpins its Cloud Application Framework.

    The company claimed the software was now completely compliant with the Java EE 6 specification and had been considerably re-engineered, both to improve performance and reduce its footprint – just 168MB, according to Mike Lehmann, the company's senior director of product management.

    Lehmann said the new version was crucial because it “enables us to put our Fusion Middleware product family into the cloud.”

    He also said this would make it possible for users to deploy the same applications locally or in public or private clouds.

    “That's an important differentiator, as many cloud environments lock you into that deployment model,” he said.

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    Other improvements in the new release include new plug-ins for dependency management, tighter integration with Oracle RAC (Real Application Clusters) for high availability and disaster recovery, support of TLS 1.2 application security and the new Fusion Middleware component Oracle Traffic Director, which provides for traffic routing and load balancing in highly virtualised environments.

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    The director also claimed it enabled multi-tier applications to be packaged as standard virtualised packages, for example.

    Lehmann noted that as well as running on the public cloud service Oracle announced earlier this year, WebLogic Server is also a key component of the new Oracle Java Cloud Service, an enterprise platform for developing, deploying and managing business-critical Java EE applications. This supports development and deployment from multiple Java-based integrated development environments.


    350 Free Online Programming Courses You Should Start Today | killexams.com real questions and Pass4sure dumps

    Programming is the most demanding skills in today’s world. Learning new programming languages can be life-changing for one’s career. With lots of new opportunities ranging in the tech industry from web development, mobile application development, machine learning, data science, data engineering, chatbot development, artificial intelligence, front-end development, backend development and more, it always necessary to learn new skills.

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    Amazon Alexa Introduction to Alexa: How to use Amazon Echo
  • Using Alexa, the Amazon echo smart home assistant, to save time, learn languages, and save time and many more.
  • Introduction to Voice Design with Amazon’s Alexa
  • Learn how to build natural user interfaces.
  • Android Android for Beginners
  • Expand your prior knowledge of Java to build basic apps for Android devices!
  • Advance Android Programming — learning beyond basics
  • Learn to save preferences using Preferences and saving data to Files in Android, Using ActionBar and more advance topics — Free Course
  • Android : Build Voting App using SMS and SQLite with zero ex
  • Build full voting app step by step!
  • ARCore and Sceneform for Android Augmented Reality (Java)
  • Learn ARCore from beginning to end. Includes theory and apps for Sceneform, Augmented Images, and Cloud Anchors.
  • The Complete Android Oreo(8.1) , N ,M and Java Development
  • Learn Android App Development with Android 8 Oreo by building real apps . Migrating existing app to Android Oreo ,Nougat.
  • Angular AngularJS: Advanced Framework Techniques
  • Performing unit and end-to-end testing.
  • Angular 2 Routing: Up And Running
  • Get Up To Speed With Angular 2 Routing In just A Quick 30 Minutes.
  • Testing Angular Apps — The Complete Guide
  • Learn to professionally test Angular apps
  • Angular and Laravel Authentication and password reset.
  • Use angluar to create SPA with Laravel and JWT.
  • Angular and Node.js Integration
  • Learn to Integrate Angular with Node.js
  • Ansible Learn Ansible From Ground Up: The Devops Guide
  • Learn Application Deployment , Configuration Management and Continuous Delivery Using Ansible.
  • Apache Spark Apache Spark Streaming with Python and PySpark
  • Add Big Data Streaming to your Data Science and Machine Learning Python Projects.
  • Apache Spark with Python — Big Data with PySpark and Spark
  • Learn Apache Spark and Python by 12+ hands-on examples of analyzing big data with PySpark and Spark.
  • Arduino Arduino Project: Line Following Robot
  • Having Fun With Arduino? Here is another Project for you to follow!
  • Arduino Bootcamp Projects — Controlling a CPU Fan with Keyboard Input — Part 1
  • Controlling a CPU fan and will allow the user to utilize the Serial Monitor in the Arduino IDE
  • ASP .NET ASP.NET: Create News Website
  • Step by step to create news web site using ASP.NET
  • Sub Domains Authentication with Asp.Net Web API
  • Build a cookie based cross sub domain authentication website with Asp.Net web API from scratch.
  • MVC Application Design using .NET Core 2.0
  • Learn how to design MVC applications for the web using .NET Core 2.0
  • REST WCF Service in ASP.NET
  • Learn how to build a RESTful WCF Service in an ASP.NET web application and call its methods with JQuery.
  • Temel Asp.Net Web Api
  • Temel Düzeyde Asp Net Web Api ve Jquery ile Get ve Post İşlemleri.
  • AWS Intro to AWS CloudFormation with WordPress Sample Lab
  • Learn how to create a highly available, fault tolerant LAMP cluster using CloudFormation
  • Mastering AWS: Featuring IAM
  • Master AWS Users, Roles, Groups, and Policies in this course!
  • Roadmap to get AWS Certified Solutions Architect Associate
  • Here is the proven approach that will show you how to become an AWS Certified Solutions Architect Associate in 30 Days.
  • Cloud Computing With Amazon Web Services
  • A beginner’s guide to learn Cloud Computing with AWS.
  • Amazon EC2 free course — Basic and Advanced topics
  • EC2 instance types , Using EC2 CLI to manage instances , EBS and instance store.
  • Bootstrap Learn to Build Websites using Twitter Bootstrap
  • A complete guide to master Twitter Bootstrap.
  • Learn to build a responsive landing page with Bootstrap 4
  • A practical guide for beginners to build a modern one-product landing page with Bootstrap 4 basics.
  • Website from Scratch in 1 hour using Bootstrap 4
  • Learn how to build a modern fully responsive website from scratch using Bootstrap 4.
  • Learn Bootstrap 4 by Example
  • Skip those boring courses full of slides and learn Bootstrap 4 by doing!
  • Bootstrap 4 中文教程
  • Bootstrap:”The most popular HTML, CSS, and JS library in the world.”
  • C C covered with Pointers and Strings [Deep Study]
  • Pointers and Strings: Learn the core concepts of Pointers and Strings in C language. All concepts are covered in deep.
  • Learn Socket Programming in C from Scratch
  • Master the socket programming concepts and start building networked applications in C programming language.
  • C# Beginners Guide to Dependency Injection for C# Developers
  • Learn the basics of Dependency Injection techniques.
  • C# Language Basics and OOPs — Get your foundation right.
  • Wonderful blending of Theory and Practicals. Each and every feature is demonstrated with real-time examples.
  • C# Basics — Learn to Code the Right Way
  • Learn C# basics and programming mindset . The first step to become a better programmer.
  • Build GIF Optimizer in C#
  • Learn How to Develop a C# application that compresses and optimizes your GIF Files in one click.
  • API in C#: The Best Practices of Design and Implementation
  • Learn how to design and implement types in C#.
  • C++ Introduction to C++
  • Get a brief introduction to the C++ language from the experts at Microsoft.
  • C++ For Absolute Beginners : The Starter Guide
  • Learn professional C++ development from ground up with no prior programming experience.
  • Learn and Understand C++
  • Take this course to learn C++ which you can use for ethical hacking, game development, and most software you use daily!
  • Advanced C++
  • Advanced dive into some of the more complex topics of C++ software development.
  • Learn C++ by Creating
  • Learn Programming Basics in C++ with a project based approach.
  • Chart Js Chart JS, the complete guide. ChartJS missing manual.
  • The Chart JS missing manual. Master how to use ChartJS and become a data visualizer with ChartJS!
  • CSS Introduction to CSS
  • Learn how to design websites in less than an hour.
  • Learn HTML and CSS from scratch
  • Take the first step in becoming a web developer by learning HTML and CSS and creating your first page template.
  • CSS Flexbox — Mastering the Basics
  • Build page layouts with ease.
  • Build a Responsive Tablesless Calendar with HTML CSS Course
  • Learn how to build a responsive tableless calendar, as well as use CSS to design the web page.
  • CSS — MASTERING ANIMATIONS
  • Make your web page alive with css animations & transitions and take your web design skills to the next level.
  • Dart Learn Dart 2.0 in 90 minutes
  • Become familiar with the basics of Dart 2.0 and start using it today.
  • Deep Learning Deep Learning: An Introduction
  • Deep Learning / Artificial Intelligence is the most exciting, highly sought & one of the fastest-growing field nowadays.
  • Blockchain and Deep Learning: Future of AI
  • Jobs Training for the Future.
  • Machine learning and Deep learning from scratch in Arabic
  • To Learn machine learning , Be a learning Machine.
  • Django A Beginners Guide to Django!
  • Learn all the basics of Django through a step-by-step process by creating your very own Polls Application for free!
  • Django Tutorials for Beginners
  • Official tutorials for thenewboston Django Tutorials for Beginners series!
  • Django for WordPress Developers
  • Learn how to code in python and how to use Django while drawing parallels to WordPress.
  • Python 3 na Web com Django (Básico e Intermediário)
  • Como desenvolver incríveis aplicações web de forma rápida.
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  • Docker wraps required software & files into a container than you can move to another system. Learn how to use Docker and its basics in this course.
  • Electron Projects in Electron: Learn Electron Framework Building Apps
  • Learn to develop cross OS desktop apps with hottest JS framework for desktop app creation.
  • Elixir Elixir : Start programming on best concurrent language
  • Learn how to getting started in one of the best scalable , concurrent programming language, elixir based on BEAM VM.
  • Express ExpressJS Fundamentals
  • A Beginner’s Guide to Building RESTful Web Applications with NodeJS and Express.
  • Learn to Build ToDo Application with Mean Stack Course
  • Mean Stack Course is a set of MongoDB, Express, Angular & Nodejs. It allows developers to create ToDo application that helps to add, edit & delete ToDos.
  • Server-side Development with NodeJS, Express and MongoDB
  • Learn Server-side Development.
  • Firebase Firebase in a Weekend: Android
  • Building a Realtime Chat App.
  • Create a CRUD Application with Ionic 3 and Firebase
  • Create a Shopping List with Ionic 3, Angular 4.3 and Firebase.
  • Simple iOS Chat App in Swift 4 & Firebase 4
  • Build a Simple Chat App with Swift 4 and Firebase 4 for iOS 11.
  • TypeScript, Angular, Firebase & Angular Material Masterclass
  • Build Single Page Application(SPA) from Scratch using Angular 5. Learn basics of TypeScript, Firebase & Angular Material.
  • Free No-SQL Visitor Comments for your Site with JavaScript
  • Using #HTML5, #CSS3, #JavaScript and a free Firebase No-SQL database.
  • Flutter Learn Flutter — Beginners Course
  • Build Android and iOS apps with a flutter framework.
  • Build Native Mobile Apps with Flutter
  • Learn from experts at Google how to use Flutter to craft high-quality native interfaces on iOS and Android devices in record time.
  • Android Start — Curso Android Básico — Java Kotlin e Flutter
  • Neste curso vamos aprender o básico sobre programação Android.
  • Git Intro to Git
  • A fast and easy guide to version control.
  • Git Beginner in VS Code
  • Learn all about Git and GitHub with VS Code.
  • Git & GitHub Crash Course: Create a Repository From Scratch!
  • Learn how to create a repo, clone it, make changes, and push to GitHub in less than 30 minutes.
  • Git and GitHub — Step by Step for Beginners
  • Understand the basic concepts of Git and Github.
  • Git Going Fast: One Hour Git Crash Course
  • Learn the key concepts and basic workflow for Git and GitHub with this easy to follow, top rated, bootcamp-style course!
  • Go Golang Tutorials Learn to Code Google’s Go Programming Language
  • Brought to you for free by: Google’s Community Outreach Working Group & GreaterCommons.
  • Database modeling with golang & postgresql
  • Learn how to do all DBMS directly from golang to postgresql.
  • Google Apps Script Google Script — DocumentApp for Beginners
  • Explore how to apply Google Script to extend functionality of documentApp within Apps Script.
  • Google Apps Script Consent Form Exercise — JavaScript Cloud
  • Practice Exercise for Learning how to use Google Apps Scripts — Track within a Spreadsheet, send email, convert to PDF.
  • GraphQL Intro to GraphQL and Apollo
  • Learn the basics of GraphQL.
  • Hadoop Hadoop Starter Kit
  • Hadoop learning made easy and fun. Learn HDFS, MapReduce and introduction to Pig and Hive with FREE cluster access.
  • Learn Hadoop
  • Learning Hadoop Online With Big Data, Map Reduce & Apache Training.
  • Learning Apache Hadoop EcoSystem- Hive
  • Learn Apache Hive and Start working with SQL queries which is on Data which is in Hadoop.
  • Big data and Hadoop framework
  • Big data, data analytics, hadoop, Apache spark, hive, pig, Data Science, Data scientist, MapReduce, Machine learning.
  • Processing Big Data with Hadoop in Azure HDInsight
  • Learn how to use Hadoop technologies in Microsoft Azure HDInsight to process big data in this five week, hands-on course.
  • Hivemall New in Big Data: Apache HiveMall — Machine Learning with SQL
  • HiveMall SQL on Spark, MapReduce and Tez. Leverage your knowledge of SQL to enter Machine Learning and Big Data space.
  • HTML Introduction to HTML
  • Learn the basics in less than an hour.
  • Learn HTML and CSS from scratch
  • Take the first step in becoming a web developer by learning HTML and CSS and creating your first page template.
  • Learn Html and CSS with fun for Beginners
  • Html and CSS from Scratch with a Real World Project.
  • Build a CSS Timeline with HTML 5 and CSS3 Course
  • Build a CSS Timeline design with the help of html5 and CSS3 online course. Learn to modify the positions and alignments using CSS3 to suit your needs.
  • Learn an Animated Car Design Using HTML and CSS3
  • Learn to Design an animated car using HTML5 and CSS3 as it reduces the amount of developing time, allowing more room for creativity when it comes to designs.
  • Ionic Create a CRUD Application with Ionic 3 and Firebase
  • Create a Shopping List with Ionic 3, Angular 4.3 and Firebase.
  • Rapid Prototyping with Ionic: Build a Data-Driven Mobile App
  • Retrieve data from multiple APIs; d3js charting, caching, databasing, RSS feeds, notes, (un)follow functionalities.
  • Curso fundamentos de Ionic!
  • Desarrolla Apps multiplataformas con un Framework que te hará recordar a Bootstrap 4!
  • Ionic 3 para iniciantes
  • Curso de desenvolvimento iniciante para ionic 3
  • Ionic 3 Essencial
  • Crie seu primeiro aplicativo híbrido com Ionic — Curso em andamento
  • Java Online Java
  • Our Online Java Course is aimed to help Beginners learn from scratch.Enrol for our Java online course today, Java Tutorial Online and Java Programming Course.
  • Java Programming-Date & Time-basics for beginners
  • Learn about Date and Time related things in java in a fast and efficient way.
  • Java Programming -Arrays-basics for beginners
  • Let’s learn about arrays and arraylists in java in a fast and efficient way.
  • Java Programming-Strings-basics for beginners
  • Let’s learn about strings in java in a fast and efficient way.
  • Java SE 6 Programming Fundamentals
  • Learn Java SE 6 Programming.
  • JavaScript Introduction to JavaScript
  • Learn the most popular programming language on the web
  • JavaScript Fundamentals 2018 ES6 for beginners
  • Learn JavaScript fundamental coding concepts. Including new ES6 syntax, start using JavaScript within web pages.
  • Data Structures in JavaScript
  • Learn to implement popular Data Structures in JavaScript. Learn real world programming and get Job ready.
  • Building Interactive Prototypes using JavaScript
  • Have a web app prototype that allows basic interaction.
  • Get started with a Simple Javascript Quiz
  • Learn projects in JavaScript and JQuery by building a simple quiz.
  • Jenkins JENKINS Beginner Tutorial — Step by Step
  • Learn Jenkins from scratch
  • Learn DevOps with Jenkins All in One Guide
  • Be a DevOps Guru and master CI and CD with Jenkins.
  • JMeter Learn JMeter
  • Master concepts of JMeter Testing and become a better tester.
  • JQuery Learn to Use jQuery UI Widgets
  • A jQuery UI Tutorial that will show you how to use tabs, accordion, datepicker and more without having to learn jQuery!
  • Build a Single Page Application with jQuery & AJAX
  • Learn one of the coolest techniques on the web and begin building quick, interactive, and attractive websites today!
  • Learn Javascript and Jquery with easy to learn tutorials
  • Learn Online Javascript and Jquery Course which provides interactive Tutorial on quick Web Building Projects using Jquery & Javascript programming.
  • Projects in jQuery Mobile: Learn by building Real World Apps
  • Learn to build mobile apps using jQuery Mobile
  • Kotlin Kotlin Tutorial
  • Learn basics of Kotin for Android
  • Android Development with Kotlin for Absolute Beginners
  • In this course you’ll master the basics of Android applications development with Kotlin.
  • Android Development with Kotlin | Mastering Intents
  • This Android Kotlin course describes the usage of intents to communicate between Android components.
  • Kotlin bootcamp for programmers
  • Learn the fundamentals of the Kotlin programming language from Kotlin experts at Google.
  • Kotlin for Android Development : Develop an App with Kotlin
  • Learn how to use Kotlin for Android Development while creating a practical real world application.
  • Kubernetes Kubernetes for Beginners (Kubernetes + Docker)
  • A Kubernetes hands-on course for absolute beginners from any background.
  • Learn Devops Kubernetes deployment by kops and terraform
  • Comprehensive Nginx deployment to Kubernetes on AWS by using kops and terraform.
  • Learn Kubernetes from a DevOps guru
  • Master Kubernetes to deploy, manage, and scale robust, performant, and reliable containerized applications with ease.
  • Laravel Laravel Deployment — Launch your Laravel Application Online
  • Deploy your laravel application online fast.
  • Laravel E-Commerce Restful API
  • Know what is Rest concept and how to create a RESTFUL API with Laravel Resource.
  • Social Network With Laravel
  • A social network built with Laravel and Bootstrap.
  • Try Laravel
  • Dig into an overview of the Laravel framework and learn how to start building PHP applications with MVC architecture.
  • Learn Laravel 5 CRUD by creating To-Do List application
  • You will create a simple application that handles daily tasks. You will add them to database, read, update and delete.
  • Linux An Introduction to SUSE Linux
  • Learning Linux using OpenSuse.
  • Linux Programming Course for Beginners
  • With this Linux tutorial you will learn about operating systems, open source, software licensing,etc. Learn linux basics in this linux course.
  • Introduction to Linux Shell Scripting
  • Learn introduction to Bash Shell Scripting to work on Linux and Unix system.
  • Linux JumpStart: Learn Linux in 3 Days, Secure a Linux Job
  • JumpStart your career by leveraging high-demand Linux Skills and secure your first Linux Job or Get Promotion.
  • Introduction To GNU make and Makefile on Linux and Unix
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  • Machine Learning Machine Learning
  • Learn about machine learning, the area of artificial intelligence (AI) that is concerned with computational artifacts that modify and improve performance through experience.
  • Neural Networks for Machine Learning
  • Neural Networks for Machine Learning from University of Toronto. Learn about artificial neural networks and how they are being used for machine learning.
  • Principles of Machine Learning
  • Get hands-on experience building and deriving insights from machine learning models using R, Python, and Azure Machine Learning.
  • Developing Big Data Solutions with Azure Machine Learning
  • Learn how to build predictive solutions for big data using Microsoft Azure Machine Learning.
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  • Explore theory and practice, and work with tools like R, Python, and Azure Machine Learning.
  • Matlab Learn MATLAB
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  • Get Started with MATLAB & Simulink: An Intro for Beginners
  • A beginner’s overview to get you started. This course will introduce you to the capabilities of MATLAB and Simulink.
  • Introduction to Programming with MATLAB
  • Introduction to Programming with MATLAB from Vanderbilt University.
  • MATLAB and Octave for Beginners
  • Learn MATLAB and Octave and start experimenting with matrix manipulations, data visualizations, functions and mathematical computations.
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  • Designing Your e-Business Site | killexams.com real questions and Pass4sure dumps

    This chapter is from the book 

    The success of an e-Business depends to a large extent on its design. While you're designing your e-Business, you should take into account all the data gathered about its requirements (refer to the earlier section "Understanding the e-Business Requirements"). When you have the data gathered as input, the designing process basically consists of two steps:

  • Choosing the design to model the e-Business

  • Customizing the design to take advantage of the peculiarities of the particular business

  • Choosing a Design Model

    Several different design trends are common for e-Businesses (refer to Table 3.2), so you should choose the model that suits your requirements. You may determine that one model doesn't satisfy all the requirements; in that case, you may have to choose a combination of designs.

    Table 3.2 e-Business Design Models Design Model Main Characteristic Main Considerations Example Niche dominator You want to be the undisputed leader in a particular market niche. Ensure that the design meets the needs of specific types of customers. Be the first to market. Work on increasing brand-name awareness. Amazon.com Information aggregator You want to make it easy for customers to search specific things quickly and be their"portal." Ensure a fast search engine. Allow customers to specify different search criteria. Yahoo! Supply chain You want to make it easier for all members of a supply chain to perform transactions. Provide additional services such as e-mail and community sites. Focus on streamlining the business as a B2B environment. Enhance the notification mechanism.Integrate internal business processes. McKeeson.com Sales channel You want to use the Internet as a new sales channel that will be used in addition to existing distribution channels. Make it easier for customers to compare your products to competitors' and see the benefit in doing business with you. Ensure easy payment and order tracking. Enhance notification mechanisms. Dell computers Customizing the Design

    After you choose the design model or models, you can look back at the data gathered by answering the questions posed earlier in the section "Understanding the e-Business Requirements." You then can customize the design to suit your organization and its goals. During the customization of the design, you can do the following:

  • Promote products and services that are superior to the competitors.

  • Provide services and support that satisfy the most important needs of the customer.

  • Focus on identifying and educating the customers with the cost savings that they will get from doing business with you.

  • Focus on making the customer experience pleasant.

  • Designing the Site

    In designing any e-Commerce site, you should have three primary goals: speed, usability, and professional appearance. Achieving all three at the same time is not easy. For example, to speed up the processing, you might use a very simple design for your Web site, but then it might not be intuitive or give a professional image of the company. On the other hand, while you're trying to make the site usable and provide a professional appearance, you might overload the site with information and graphics that make it very slow.

    Design is a balancing act considering all the previously discussed criteria. Your site design should do the following:

  • Make the user comfortable in using the Web site—for example, allowing real-time contact with a sales person or access to a bulletin board

  • Answer any questions the user may have

  • Allow quick order entry

  • Allow a variety of payment options

  • Allow tracking of shipment and orders

  • Be consistent with your existing business by trying to incorporate existing logos, store designs, and so on

  • Have acceptable performance even on slow connections such as 28.8K or 56K modems

  • Web Server Logs

    Analyze your Web server's log files to determine how the users are using the Web site and where they spend the most time.

    Here are some helpful tips for Web site design:

  • Give the users an overview of what the company provides and let them progressively click down to the details. Keep as much information as possible visible without cluttering the screen.

  • Make sure that the navigation items don't take up too much of the screen space.

  • Keep the design simple and straightforward. Don't use unnecessary colors and graphics.

  • Maintain an identity. For example, the page layout, HTML links, text, logo, and colors all give a unique identity to your Web site, so you should plan carefully depending on what the actual business is and what message you want to convey to the users.

  • Build sites that work regardless of the users' configurations, such as resolution and modem speed.

  • Designing the Web Applications

    Designing Web-based applications and the architecture to support them is different from designing client/server applications. In the following sections, we'll look at some differences that an iDBA has to consider when making the transition from a traditional DBA role.

    Using JavaScript Versus PL/SQL for Validation

    Using client-side JavaScript code makes it efficient to perform client-side validation, especially if the users will be entering a great deal of information (that requires validation) on the HTML forms. For example, if the HTML form has required fields and if the validation is done using PL/SQL procedures, the PL/SQL procedures would need to verify each field and send back a meaningful error message for each field that is empty. This process is not very good because the user has to wait while the information is compiled on the server and the message is sent to the browser. JavaScript, on the other hand, allows you to create functions that can perform validation after the user clicks the Submit button.

    Controlling Access to the Data

    Several alternatives are available for controlling access to the database:

  • Using the application server's security functions—Oracle Internet Application Server (iAS), for example, allows you to restrict access to the entire application or only certain packages within the application. When the user logs in, the application server can determine the privileges assigned to that user and generate a cookie that is sent back to the user's PC. This cookie, which contains the necessary information about privileges, is persistent for the duration of the time the user's browser is open.

  • Using the database's access control mechanism—This method relies on the use of the Oracle database security mechanisms in place for controlling access to the database tables. This technique is best because security is centralized and not dependent on any access control via screens or session tracking. Chapter 8, "Security Issues," discusses some security solutions that you can use.

  • Employing custom-developed user profiles—This method does not use session information for controlling access; instead, you need to implement an alternative means of tracking user logons, such as with the help of cookies or passing login and other user preference information from one screen to another. This method is the most flexible but also requires the most effort because the implementation of security would require the development of your own user profile table, login screens, cookie management, and so on.

  • When you're dealing with users who are not set up to accept cookies and your application uses cookies, you could end up with a problem in which some obscure PL/SQL and Oracle errors are sent back to the users. A better approach is to display an information page that indicates to the users exactly why the application is unusable (that is, the cookie is not accepted by their settings). This page will allow them to determine whether they really want to accept the cookies.

    Organize Your Directories

    Different types of files are used in e-Business applications. It therefore would be useful for maintenance purposes to organize these files by their type, such as HTML files, PL/SQL source code, Java programs, CGI executables, Help files, and application images.

    Considering Load Times of Images

    Users usually have a very short attention span for Web applications; therefore, testing the download times of your Web pages is important. For this task, you could use the service of a company such as NetMechanic (http://www.netmechanic.com) that specializes in determining download times and reporting HTML problems.

    You can employ several techniques to ensure that the load time of an image is minimized:

  • Experiment with different numbers of colors and determine the minimum number needed for the image. Then set the resolution to the lowest possible. Reducing the number of colors could affect the image quality but will improve the download time.

  • Use the LOWSRC attribute of the <IMG> tag. This attribute causes the lowest resolution copy of the image to be loaded when the <IMG> tag is encountered, and the real image is loaded in the background later. tag;LOWSRC attribute>

  • Identify the images with the longest load time and preload them into the client PC's memory.

  • Specify the WIDTH and HEIGHT attributes of the <IMG> tag so that the browser doesn't spend time calculating. tag;WIDTH attribute> tag;HEIGHT attribute>

  • Save images in the proper file format: JPEG, for images containing multiple colors and shades, and GIF, for images with a few basic colors. GIF (Graphics Interchange Format) can be used to compress images by saving large areas of a single color in a different format. As a result, the image is smaller than the corresponding JPEG (Joint Photographic Experts Group format).

  • Considering Which Results to Show

    A query submitted by a user may return a large number of records. The basic question you must answer is "How many records should we display at a time?" You should consider several factors in making this decision:

  • The user probably won't be able to absorb large quantities of information at the same time.

  • Supplying too much information at the same time could significantly affect the download time.

  • Displaying only a few records at a time could be frustrating to a user if she wants to look at records that are not returned in the first few pages—for example, if she can view 20 records at a time and the records of interest are really in the 50th page.

  • Consider queries run by multiple users at the same time. Can the results be cached? Can cursors be reused? Can execution plans be optimized?

  • Is it possible to refine and rewrite the query to be more selective? If so, the Web application should provide the necessary functionality to allow the user to specify the criteria to make the query selective.

  • Always Keep an Eye on the Target

    Numerous times I have come across competing products such that, after working with the products, I find that product A is a far more technically superior product than product B, but in spite of this fact, product B is very popular with the general public. You might think that this is not fair, but in reality, it happens all too often. Why? Because product A didn't really focus on its audience. It often takes a long time for people to figure out this basic fact.

    When designing your e-Business, you should look at the requirements and constraints of the applications to be used and/or implemented. This will help you in designing the system and applications to suit the primary audience and users of the system.

    Archiving Data

    Databases can grow quite rapidly, and frequently a quick analysis will show that a great deal of data is accessed rarely. You can speed up information processing and query performance by archiving this data. You can use several techniques for the purpose of purging and archiving data:

  • Partitioning—Partitioning tables can provide a number of advantages:

  • Increase the performance of data retrieval

  • Allow users to access different partitions with minimal impact on other users

  • Allow users to write partition-aware queries

  • The success of the partitioning technique depends on ensuring that the partitions reside on different disk controllers. For example, you can create a table with partitions that use different tablespaces such that the tablespaces reside on physically different disks (controlled by different disk controllers).

  • Data purging—Periodically, you might want to purge data so that the database size is kept manageable and performance kept high. However, this process is not easy for several reasons:

  • How do you choose what to purge and what not to purge?

  • How do you ensure that the purging process maintains the referential integrity?

  • What type of archival process should you use in conjunction with the data purge mechanism?

  • You can associate a flag with the stored data to indicate whether it is purged or archived. You also could use a time stamp to track the archival process. You should determine the data purge and archival process early in the design phase so that the data model and choice of which business rules to support can factor in this process. By making this decision early, you can easily address the data purge and archive issues when the database starts growing rapidly after it is put in production.

    The purge and archival process can be implemented using third-party tools such as Quest Software's Data Manager or can even be implemented manually by means of triggers that move data from the transactional tables to the historical tables based on some predefined criteria.

    Understanding Application Frameworks

    In an e-Business, application design and business design are closely tied together. Essentially, this means that in an e-Business architecture, the various isolated business applications such as order management, inventory management, customer service, financials, supply chain, and so on should be linked together in well-integrated modular building blocks that are often referred to as enterprise applications.

    We have entered an era of complex, multifunctional integrated applications called application frameworks. These application frameworks, which form the foundation of an e-Business, are modular in nature, allowing the independent design of small subsystems that can function together to provide a complex service. Figure 3.2 shows how business applications have evolved over time. As you can see from this figure, business applications have evolved through three stages:

    Stage 1 In this early stage, the business applications were task oriented, had a narrow focus, and were specialized—for example, order entry. These applications improved productivity of individual application segments, but the overall flow was slow and error prone. Stage 2 This stage was advocated in the 1980s, wherein the applications were transformed to be more function oriented; for example, the order entry application transformed into a sales application. Stage 3 In the early 1990s, businesses underwent significant changes that resulted in process reengineering. As a result, the focus shifted to the management and optimization of processes that are cross functional.

    Figure 3.2 Evolution of business applications.

    Let's look at the major cross-functional application frameworks and how the various functional applications are integrated into them:

  • Customer Relationship Management (CRM)

  • Sales

    Customer service

    Marketing

  • Enterprise Resource Planning (ERP)

  • Planning

    Forecasting

    Purchasing

    Inventory and warehousing

    Distribution

    Accounting

    Finance

  • Supply-Chain Management (SCM)

  • Market demand

    Scheduling

    Resource planning

    Capacity constraints

  • e-Procurement

  • Office supplies

    Business travel

    Service procurement, such as couriers, catering, health and safety, and so on

    Computer equipment and supplies

  • Selling-Chain Management (SeCM)

  • Pricing

    Contracts

    Product customization

    Commissions

    Quotes and proposals

  • Business Intelligence (BI)

  • Business analysis (reporting and filtering)

    Decision support systems

    Delivery systems

    Data capture

    Data warehousing

  • Figure 3.3 shows the various important application frameworks within an e-Business architecture.

    The application frameworks described in the preceding lists are being rapidly adopted by businesses and require improved coordination between the various departments. Each application framework is a cluster of related functions that together provide a complex service.

    Buying or Building the Application Frameworks

    Companies often have to answer the question "To build or not to build?" This question has to be answered, even for application frameworks. Most companies that are trying to go in the application cluster path tend to buy and deploy packaged applications such as those provided by business application vendors—for example, Siebel Systems, SAP, Oracle, PeopleSoft, J.D. Edwards, Baan, Clarify, and others. Following this approach is probably a better idea than building your own applications because you can easily customize most of the vendor-provided applications and your business should be focusing on building brand-name awareness, increasing customer loyalty, and providing solutions to customers instead of developing complex applications and reinventing the wheel. Using modular systems and packaged software has become increasingly acceptable and important in e-Businesses.

    Figure 3.3 e-Business application framework.



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