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1Z0-058 exam Dumps Source : Oracle real Application Clusters 11g(R) Release 2 and Grid Infrastructure Administration

Test Code : 1Z0-058
Test cognomen : Oracle real Application Clusters 11g(R) Release 2 and Grid Infrastructure Administration
Vendor cognomen : Oracle
: 139 real Questions

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Oracle Oracle real Application Clusters

Oracle Database 12c unencumber 2 actual utility Clusters handbook: ideas, Administration, Tuning & Troubleshooting | killexams.com real Questions and Pass4sure dumps

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Oracle Clusterware and Oracle suitable software Clusters | killexams.com real Questions and Pass4sure dumps

This chapter introduces Oracle Clusterware and Oracle precise application Clusters (Oracle RAC) by describing these items as well as a artery to installation, administer, and installation them. This chapter describes Oracle Clusterware and Oracle RAC architectures as neatly as the software and hardware accessories for each of those products. This chapter likewise in brief describes workload management, services, and high availability for each single-instance Oracle databases and Oracle RAC environments. This chapter comprises here themes:

Oracle Clusterware and Oracle real application Clusters

A cluster includes multiple interconnected computer systems or servers that issue as if they're one server to conclusion clients and applications. Oracle Database 10g suitable application Clusters (Oracle RAC) enables the clustering of the Oracle Database. Oracle RAC makes consume of Oracle Clusterware for the infrastructure to bind distinctive servers so that they operate as a solitary system.

Oracle Clusterware is a conveyable cluster administration retort it really is integrated with the Oracle database. The Oracle Clusterware is additionally a required Part for the usage of Oracle RAC. additionally, Oracle Clusterware enables both single-instance Oracle databases and Oracle RAC databases to consume the Oracle high availability infrastructure. The Oracle Clusterware enables you to create a clustered pool of storage for consume by means of any combination of single-example and Oracle RAC databases.

Oracle Clusterware is the simplest clusterware that you simply requisite for most systems on which Oracle RAC operates. that you can additionally consume clusterware from different vendors if the clusterware is certified for Oracle RAC.

Single-example Oracle databases acquire a one-to-one relationship between the Oracle database and the illustration. Oracle RAC environments, although, acquire a one-to-many relationship between the database and cases. In Oracle RAC environments, the cluster database cases access one database. The combined processing vim of the dissimilar servers can supply enhanced throughput and scalability than is accessible from a solitary server. Oracle RAC is the Oracle Database option that offers a solitary apparatus photograph for multiple servers to entry one Oracle database. In Oracle RAC, each and every Oracle illustration usually runs on a divorce server.

Oracle RAC is a special technology that provides unreasonable availability and scalability for indelicate software varieties. The Oracle RAC infrastructure is likewise a key element for enforcing the Oracle commercial enterprise grid computing architecture. Having dissimilar cases entry a solitary database prevents the server from being a solitary point of failure. Oracle RAC enables you to mix smaller commodity servers privilege into a cluster to create scalable environments that aid mission crucial company applications. applications that you installation on Oracle RAC databases can function with out code alterations.

The Oracle Clusterware structure and Oracle Clusterware Processing

The Oracle Clusterware is application that when installed on servers operating the equal working device, allows for the servers to subsist confident collectively to function as if they were one server. The Oracle Clusterware requires two clusterware accessories: a vote casting disk to listing node membership counsel and the Oracle Cluster Registry (OCR) to listing cluster configuration suggestions. The vote casting disk and the OCR acquire to dwell on shared storage. The Oracle Clusterware requires that every node subsist linked to a personal network by the consume of a personal interconnect.

The inner most interconnect that Oracle Clusterware requires is a divorce community that you just configure between the cluster nodes. This interconnect, which is required by means of Oracle RAC, can likewise subsist the identical community that the clusterware makes consume of, however the interconnect should no longer subsist purchasable through nodes that don't seem to subsist a Part of the cluster.

Oracle recommends that you simply configure a redundant interconnect to wait away from the interconnect from being a solitary factor of failure. Oracle additionally recommends that you just consume user Datagram Protocol (UDP) on a Gigabit Ethernet in your cluster interconnect. Crossover cables are not supported to subsist used with Oracle Clusterware or Oracle RAC databases.

The Oracle Clusterware manages node membership and prevents split intuition syndrome wherein two or extra cases try and ply the database. this can ensue in cases where there's a spoil in conversation between nodes throughout the interconnect.

The Oracle Clusterware architecture helps unreasonable availability via instantly restarting stopped add-ons. The Oracle Clusterware can automatically re-start a node to evade issues with that node from affecting the supply of the leisure of the Oracle RAC environment. In an Oracle RAC atmosphere, indelicate Oracle techniques are under the ply of the Oracle clusterware. The Oracle Clusterware likewise provides an utility programming interface (API) that allows you to control different Oracle processes with Oracle Clusterware.

Oracle Clusterware application element Processing particulars

The Oracle Clusterware contains a couple of inheritance tactics that facilitate cluster operations. The Cluster Synchronization service (CSS), experience administration (EVM), and Oracle Cluster components communicate with other cluster Part layers within the different cases in the equal cluster database ambiance. These components are likewise the main verbal exchange hyperlinks between the Oracle Clusterware unreasonable availability accessories and the Oracle Database. additionally, these components computer screen and manage database operations.

the following list describes the services of one of the most essential Oracle Clusterware accessories. This listing includes these components which are procedures on Unix and Linux working techniques or functions on home windows.

notice:

On home windows-based mostly working techniques, most of the add-ons are threads of the Oracle process in its station of divorce strategies.
  • Cluster Synchronization capabilities (CSS)—Manages the cluster configuration by artery of controlling which nodes are members of the cluster and with the aid of notifying participants when a node joins or leaves the cluster. when you are using third-celebration clusterware, then the css manner interfaces with your clusterware to manage node membership suggestions.

  • Cluster ready functions (CRS)—The simple program for managing unreasonable availability operations within a cluster. anything else that the crs technique manages is referred to as a cluster useful resource which generally is a database, an illustration, a service, a Listener, a virtual IP (VIP) tackle, an application procedure, and so forth. The crs procedure manages cluster components in line with the resource's configuration guidance that is saved in the OCR. This includes delivery, cease, parade screen and failover operations. The crs process generates activities when a useful resource fame changes. when you've got installed Oracle RAC, crs displays the Oracle instance, Listener, and so on, and instantly restarts these accessories when a failure occurs. by using default, the crs technique makes five attempts to restart a useful resource after which does not manufacture further restart makes an attempt if the aid does not restart.

  • adventure administration (EVM)—A historical past manner that publishes pursuits that crs creates.

  • Oracle Notification provider (ONS)—A post and subscribe service for communicating quick software Notification (FAN) hobbies.

  • RACG—Extends clusterware to assist Oracle-selected requirements and complicated materials. Runs server callout scripts when FAN hobbies happen.

  • system monitor Daemon (OPROCD)—This manner is locked in reminiscence to monitor the cluster and provide I/O fencing. OPROCD performs its assess, stops working, and if the wake up is past the expected time, then OPROCD resets the processor and reboots the node. An OPROCD failure results in Oracle Clusterware restarting the node. OPROCD makes consume of the hangcheck timer on Linux systems.

  • In here table, if a process has a (r) beside it, then the procedure runs as the root consumer. in any other case the process runs as the oracle person.

    table 1-1 checklist of strategies and home windows functions linked to Oracle Clusterware

    Oracle Clusterware part Linux/Unix system windows servicesWindows processes

    process monitor Daemon

    oprocd (r)

    OraFenceService

    RACG

    racgmain, racgimon

    racgmain.exe racgimon.exe

    Oracle Notification service (ONS)

    ons

    ons.exe

    experience manager

    evmd (r), evmd.bin, evmlogger

    OracleEVMService

    evmlogger.exe, evmd.exe

    Cluster in a position

    crsd.bin (r)

    OracleCRSService

    crsd.exe

    Cluster Synchronization capabilities

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

    OracleCSService

    ocssd.exe

    The Oracle Clusterware software add-ons

    When Oracle Clusterware operates, a couple of platform-certain methods or features will likewise subsist running on each node within the cluster to aid Oracle Clusterware. The Oracle Clusterware platform-particular UNIX-based mostly procedures and home windows-based services are described below here headings:

    Oracle Clusterware approaches on UNIX-primarily based techniques

    The Oracle Clusterware techniques on UNIX-based programs are:

  • crsd—Performs unreasonable availability healing and management operations corresponding to preserving the OCR and managing utility substances. This technique runs as the root user, or through a consumer within the admin neighborhood on Mac OS X-based programs. This system restarts automatically upon failure.

  • evmd—adventure supervisor daemon. This system additionally begins the racgevt manner to exploit FAN server callouts.

  • ocssd—Manages cluster node membership and runs because the oracle user; failure of this process results in cluster restart.

  • oprocd—method parade screen for the cluster. solemnize that this technique best looks on structures that don't consume dealer clusterware with Oracle Clusterware.

  • notice:

    Oracle RAC on Linux platforms can acquire multiple threads that seem as divorce methods with divorce procedure identifiers. Oracle Clusterware capabilities on windows-based mostly techniques

    The Oracle Clusterware features on windows-primarily based methods are:

  • OracleCRService—Performs high availability restoration and administration operations similar to retaining the OCR and managing application resources. This manner runs because the root user, or with the aid of a user within the admin community on Mac OS X-primarily based systems. This manner restarts immediately upon failure.

  • OracleCSService—Manages cluster node membership and runs as oracle person; failure of this manner consequences in cluster restart.

  • OracleEVMService—adventure supervisor daemon. This technique likewise starts the racgevt manner to control FAN server callouts.

  • OraFenceService—process monitor for the cluster. notice that this manner handiest appears on systems that don't consume dealer clusterware with Oracle Clusterware.

  • The Oracle precise utility Clusters structure and Oracle real utility Clusters Processing

    An Oracle RAC database is a logically or physically shared every slight thing database. indelicate datafiles, control info, PFILEs, and redo log files in Oracle RAC environments requisite to live on cluster-conscious shared disks so that indelicate of the cluster database situations can entry them. indelicate the situations must likewise partake the identical interconnect. additionally, Oracle RAC databases can partake the identical interconnect that Oracle Clusterware makes consume of.

    as a result of an Oracle RAC database makes consume of a shared every slight thing architecture, Oracle RAC requires cluster-aware storage for indelicate database data. it's your option as to the artery to configure your disk, but you requisite to consume a supported cluster-conscious storage solution. Oracle Database 10g offers automated Storage administration (ASM), which is the advised solution to control your disk. despite the fact you may likewise additionally consume a cluster-conscious quantity supervisor or a cluster file device (no longer required). In Oracle RAC, the Oracle Database utility manages disk entry and the Oracle utility is licensed to subsist used on a variety of storage architectures. An Oracle RAC database can acquire as much as 100 instances. reckoning on your platform, which you could consume the following file storage alternatives for Oracle RAC:

  • ASM, which Oracle recommends

  • Oracle Cluster File device (OCFS), which is purchasable for Linux and windows structures, or a 3rd-birthday celebration cluster file device this is licensed for Oracle RAC

  • A network file device

  • raw contraptions

  • Oracle RAC databases fluctuate architecturally from Oracle RACsingle-instance Oracle databases in that every Oracle RAC database instance likewise has:

    All nodes in an Oracle RAC environment should hook up with a autochthonous region network (LAN) to allow users and functions to access the database. purposes may still consume the Oracle Database capabilities characteristic to hook up with an Oracle database. functions allow you to define suggestions and features to manage how clients and functions hook up with database instances. These traits consist of a special name, workload balancing and failover options, and unreasonable availability traits. Oracle web functions allows the weight balancing of utility connections across indelicate of the circumstances in an Oracle RAC database.

    users can entry an Oracle RAC database using a consumer-server configuration or through one or more middle tiers, with or with out connection pooling. clients can subsist DBAs, builders, software users, energy users, akin to data miners who create their personal searches, and so on.

    Most public networks customarily consume TCP/IP, however you can consume any supported hardware and application aggregate. Oracle RAC database circumstances may likewise subsist accessed through a database's described, default IP tackle and thru VIP addresses.

    observe:

    do not to manufacture consume of the interconnect or the deepest community for person conversation as a result of Cache Fusion uses the inner most interconnect for inter-illustration communications.

    apart from the node's host cognomen and IP address, you acquire to likewise apportion a digital host cognomen and an IP ply to each and every node. The digital host cognomen or VIP may still subsist used to connect with the database example. for example, you might enter the digital host cognomen CRM in the ply listing of the tnsnames.ora file.

    A virtual IP ply is an alternate public tackle that client connections consume as an alternative of the benchmark public IP handle. To configure VIP addresses, you deserve to reserve a spare IP ply for every node that makes consume of the equal subnet because the public network.

    If a node fails, then the node's VIP fails over to a further node on which the VIP can't settle for connections. often, VIPs fail over when the node on which a VIP runs fails or if indelicate interfaces for the VIP fail or are disconnected from the network. valued clientele that try to hook up with the VIP receive a speedy connection refused oversight as a substitute of awaiting TCP connect timeout messages. You configure VIP addresses in the tackle checklist to your database connection definition to allow connectivity. here section describes the Oracle RAC software accessories in additional detail.

    The Oracle precise software Clusters software add-ons

    Oracle RAC databases acquire two or greater database cases that every hold memory buildings and history procedures. An Oracle RAC database has the identical tactics and reminiscence buildings as a single-example Oracle database in addition to extra system and reminiscence structures that are selected to Oracle RAC. anyone example's database view is practically just like another instance's view in the identical Oracle RAC database; the view is a solitary system vivid of the atmosphere.

    each and every instance has a buffer cache in its apparatus international region (SGA). the usage of Cache Fusion, Oracle RAC environments logically mix each and every illustration's buffer cache to allow the situations to technique facts as if the statistics resided on a logically combined, solitary cache.

    word:

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

    To manufacture confident that each Oracle RAC database instance obtains the screen that it should fulfill a question or transaction, Oracle RAC situations consume two approaches, the world Cache service (GCS) and the global Enqueue service (GES). The GCS and GES preserve information of the statuses of every facts file and each cached screen using a worldwide aid listing (GRD). The GRD contents are allotted throughout indelicate the lively cases, which comfortably increases the measurement of the device global region for an Oracle RAC instance.

    After one illustration caches records, every other instance in the identical cluster database can purchase a screen vivid from one other instance in the equal database faster than by means of analyzing the screen from disk. for this reason, Cache Fusion moves existing blocks between situations rather than re-reading the blocks from disk. When a consistent screen is required or a modified screen is required on another illustration, Cache Fusion transfers the screen photograph without delay between the affected cases. Oracle RAC uses the deepest interconnect for inter-instance communication and screen transfers. The international Enqueue service parade screen and the instance Enqueue manner manages entry to Cache Fusion materials in addition to enqueue recuperation processing.

    These Oracle RAC methods and the GRD collaborate to allow Cache Fusion. The Oracle RAC strategies and their identifiers are as follows:

  • LMS—international Cache provider technique

  • LMD—global Enqueue carrier Daemon

  • LMON—global Enqueue carrier parade screen

  • LCK0—instance Enqueue technique

  • in case you consume community connected Storage (NAS), then you are required to configure a 2nd deepest community. entry to this network is usually controlled by artery of the supplier's utility. The deepest community makes consume of static IP addresses.

    be aware:

    most of the Oracle accessories that this section describes are moreover the add-ons which are described for single-illustration Oracle databases in Oracle Database ideas. Oracle Clusterware accessories and unreasonable Availability

    should you mix Oracle Clusterware and Oracle RAC, which you can obtain dazzling scalability and high availability. The Oracle Clusterware achieves this the consume of the components that this Part describes under privilege here subject matters:

    The Oracle Clusterware balloting Disk and Oracle Cluster Registry

    The Oracle Clusterware requires privilege here two captious info:

  • vote casting Disk—Manages cluster membership by the consume of a health examine and arbitrates cluster ownership among the many cases in case of network disasters. Oracle RAC makes consume of the vote casting disk to investigate which cases are contributors of a cluster. The vote casting disk should wait on shared disk. for prime availability, Oracle recommends that you've varied balloting disks. The Oracle Clusterware allows several vote casting disks but you should acquire an odd variety of vote casting disks, akin to three, 5, etc. if you define a solitary vote casting disk, then you should definitely consume exterior mirroring to deliver redundancy.

  • Oracle Cluster Registry (OCR)—keeps cluster configuration information as well as configuration suggestions about any cluster database inside the cluster. The OCR likewise manages counsel about strategies that Oracle Clusterware controls. The OCR stores configuration suggestions in a sequence of key-value pairs inside a listing tree structure. The OCR ought to reside on shared disk it truly is purchasable by using indelicate of the nodes on your cluster. The Oracle Clusterware can multiplex the OCR and Oracle recommends that you consume this function to manufacture unavoidable cluster unreasonable availability. that you could change a failed OCR online, and you can replace the OCR via supported APIs comparable to commercial enterprise supervisor, the Server ply Utility (SRVCTL), or the Database Configuration assistant (DBCA).

  • be aware:

    both the vote casting disks and the OCRs acquire to live on either cluster file gadget data or on shared raw devices that you configure prior to installing Oracle Clusterware and Oracle RAC. Oracle Clusterware high Availability and the application Programming Interface

    Oracle Clusterware offers a high availability application programming interface (API) so you might consume to enable Oracle Clusterware to control functions or approaches that race a cluster. This makes it feasible for you to give unreasonable availability for indelicate your functions. The Oracle Clusterware with ASM makes it feasible for you to create a consolidated pool of storage to lead both the single-instance Oracle databases and the Oracle RAC databases which are operating on your cluster.

    To maintain unreasonable availability, Oracle Clusterware add-ons can respond to status changes to restart functions and tactics based on described unreasonable availability suggestions. in addition, that you can consume the Oracle Clusterware high availability framework by artery of registering your applications with Oracle Clusterware and configuring the clusterware to start, stop, or relocate your utility methods. this is, you can manufacture custom functions tremendously obtainable through the consume of Oracle Clusterware to create profiles that computer screen, relocate, and restart your applications. The Oracle Clusterware responds to FAN activities which are created by an Oracle RAC database. Oracle broadcasts FAN pursuits when cluster servers can likewise eddy into unreachable and community interfaces are sluggish or non-practical.

    Workload management with Oracle real application Clusters

    Workload administration allows you to exploit the distribution of workloads to deliver optimal efficiency for users and purposes. This includes proposing the highest availability for database connections, speedy failure healing, and balancing workloads optimally throughout the active configuration. Oracle Database 10g with Oracle RAC contains many features that may enlarge workload management equivalent to connection load balancing, quick connection failover (FCF), the load balancing advisory, and Runtime Connection Load Balancing. Workload administration offers the most excellent advantages to Oracle RAC environments. which you can, youngsters, select competencies of workload administration by using Oracle services in single-example Oracle Databases, especially those who consume information safeguard or Streams. Workload management contains here components:

  • excessive Availability Framework—The Oracle RAC unreasonable availability framework enables the Oracle Database to retain accessories in a running situation consistently. Oracle unreasonable availability implies that Oracle Clusterware screens and restarts crucial accessories in the event that they cease, unless you override the restart processing. The Oracle Clusterware and Oracle RAC likewise provide alerts to clients when configurations exchange. This allows for consumers to instantly react to the alterations, enabling software developers to conceal outages and reconfigurations from finish users. The scope of Oracle unreasonable availability spans from the restarting of stopped Oracle approaches in an Oracle database instance to failing over the processing of an entire instance to other available circumstances.

  • Load Balancing Advisory—here's the skill of the database to give tips to purposes about the current service levels being offered by artery of the database and its circumstances. applications can select competencies of this suggestions to direct connection requests to the illustration that will provide the application request with the optimum service first-class to comprehensive the utility's processing. Oracle has integrated its Java Database Connectivity (JDBC) and Oracle facts company for .web (ODP.web) connection pools to work with the weight balancing counsel. purposes can consume the built-in connection swimming pools devoid of programmatic changes.

  • capabilities—Oracle Database 10g introduces a powerful computerized workload management facility, referred to as capabilities, to enable the trade grid vision. capabilities are entities for you to silhouette in Oracle RAC databases. features enable you to community database workloads and route the work to the optimal situations that are assigned to system the carrier. in addition, that you could consume functions to silhouette the elements that Oracle assigns to process workloads and to computer screen workload substances. applications that you apportion to functions transparently acquire the defined workload administration features, together with high availability and cargo balancing guidelines. Many Oracle database points are integrated with services, akin to useful resource supervisor, which allows you to preclude the elements that a carrier can consume within an illustration. Some database features are additionally integrated with Oracle Streams, advanced Queuing, to achieve queue station transparency, and the Oracle Scheduler, to map capabilities to unavoidable job courses.

    In Oracle RAC databases, the service performance rules that you just configure ply the quantity of labor that Oracle allocates to every attainable instance for that provider. As you extend your database by artery of including nodes, purposes, accessories of applications, and so forth, you can add extra capabilities.

  • Connection Load Balancing— Oracle internet functions provides connection load balancing for database connections. Connection load balancing occurs when the connection is created. Connections for a given carrier are balanced across indelicate of the running cases that present the carrier. you should definitely silhouette the artery you want connections to subsist balanced within the service definition. despite the fact, you acquire to nonetheless configure Oracle web functions. when you enable the load balancing advisory, the Listener uses the load balancing advisory for connection load balancing.

  • Introduction to installing Oracle Clusterware and Oracle precise software Clusters

    This region introduces the storage alternate options for Oracle RAC and the setting up techniques for both Oracle Clusterware and Oracle RAC under here themes:

    Oracle Clusterware setting up manner Description

    The Oracle Clusterware is allotted on the Oracle Database 10g installing media. The Oracle conventional Installer (OUI) installs Oracle Clusterware privilege into a directory constitution, which may likewise subsist called CRS_home, that is become independent from other Oracle software working on the laptop. as a result of Oracle Clusterware works carefully with the working equipment, gadget administrator entry is required for some of the installing initiatives. additionally, one of the Oracle Clusterware techniques requisite to race because the device administrator, which is often the root person on Unix and Linux systems and the system Administrator user on home windows methods.

    prior to installing Oracle Clusterware, Oracle recommends that you race the Cluster Verification Utility (CVU) to ensure that your atmosphere meets the Oracle Clusterware installation requirements. The OUI additionally instantly runs CVU at the conclusion of the clusterware setting up to examine quite a few clusterware add-ons. The CVU simplifies the setting up, configuration, and benchmark management of the Oracle Clusterware installing system through settling on complications in cluster environments.

    throughout the Oracle Clusterware installing, you should determine three IP addresses for every node that is going to subsist Part of your installation. One IP ply is for the deepest interconnect and the other is for the universal public interconnect. The third IP address is the virtual IP tackle that purchasers will consume to connect with every example.

    The Oracle Clusterware installation process creates the vote casting disk and OCR on cluster-conscious storage. in case you elect the option for benchmark redundant copies throughout the setting up manner, then Oracle Clusterware instantly continues redundant copies of these data to avoid the info from becoming solitary elements of failure. The ordinary redundancy feature likewise eliminates the requisite for third birthday celebration storage redundancy options. if you consume customary redundancy, Oracle Clusterware instantly keeps two copies of the Oracle Cluster Registry (OCR) file and three copies of the balloting Disk file.

    word:

    in case you opt for exterior redundancy for the OCR and voting disk, then to permit redundancy, your disk subsystem ought to subsist configurable for RAID mirroring. otherwise, your gadget could subsist susceptible because the OCR and vote casting disk are solitary elements of failure. Oracle suitable utility Clusters installation and Database introduction process Description

    The Oracle RAC application is disbursed as a Part of the Oracle Database 10g installation media. via default, the commonplace Oracle Database 10g software installation manner installs the Oracle RAC choice when it recognizes that you're performing the installing on a cluster. The OUI installs Oracle RAC into a directory constitution, which can likewise subsist referred to as Oracle_home, this is wreck away different Oracle software running on the laptop. as a result of OUI is cluster-mindful, it installs the Oracle RAC utility on the entire nodes that you just defined to subsist a Part of the cluster. if you're the usage of a certified cluster file gadget for the Oracle home, then only opt for the node that you're connected to for the installing.

    You acquire to first installation Oracle Clusterware earlier than setting up Oracle RAC. After Oracle Clusterware is operational, that you would subsist able to consume OUI to install the Oracle database utility with the Oracle RAC add-ons. indelicate through the setting up, OUI runs DBCA to create your Oracle RAC database in response to the alternatives that you simply choose. The DBCA additionally runs the web Configuration assistant (NETCA) to configure the community for your Oracle RAC environment.

    Oracle recommends that you simply elect ASM during the setting up to simplify storage management; ASM instantly manages the storage of indelicate database files within disk businesses. which you can likewise configure capabilities privilege through setting up, counting on your processing necessities. if you are the usage of the Oracle Database 10g universal version, then you definately ought to consume ASM for storing indelicate the database information.

    via default, DBCA creates one carrier on your environment and this service is for the database. The default carrier is attainable on indelicate circumstances in an Oracle RAC environment, except the database is in restricted mode.

    Cloning Oracle Clusterware and Oracle RAC application in Grid Environments

    This region in short summarizes the tactics for deploying Oracle RAC in grid environments that acquire tremendous numbers of nodes using cloned photographs for Oracle Clusterware and Oracle RAC. Oracle cloning is the preferred components of extending your Oracle RAC atmosphere with the aid of adding nodes and situations. To function the cloning tactics which are summarized in this section, mention to the Oracle commonplace Installer and OPatch consumer's ebook.which you could additionally consume trade manager Grid ply to execute cloning.

    The cloning system assumes that you simply correctly installed an Oracle Clusterware home and an Oracle home with Oracle RAC on at least one node. furthermore, indelicate root scripts should acquire race efficiently on the node from which you're extending your cluster database. to manufacture consume of Oracle cloning, first clone the Oracle Clusterware home and then clone the Oracle home with the Oracle RAC application.

    To clone the Oracle Clusterware home, on UNIX-primarily based methods create a tar file of the Oracle Clusterware home and duplicate the file to the modern node's Oracle Clusterware domestic. On home windows-based mostly programs you requisite to create zip info. Then on UNIX-based mostly systems create the necessary users and companies on the brand modern nodes. On home windows-based techniques, you achieve not requisite to create users and corporations, however the user that performs the cloning should subsist the equal consumer that performed the setting up.

    Extract the tar file, or unzip the zip file, and race the Oracle regular Installer (OUI) in clone mode as described within the Oracle frequent Installer and OPatch person's guide. Then race the setting up scripts and reiterate these steps on every node that you are including. The system for cloning the Oracle home onto modern nodes is comparable to the technique for cloning the Oracle Clusterware home. in addition, you requisite to race the Oracle net Configuration assistant (NETCA) on each and every modern node to create a Listener.

    if you acquire not already created a database, then which you can race the Database Configuration assistant (DBCA) to create one. at last, solemnize the submit-cloning procedures to comprehensive the extension of your Oracle RAC ambiance onto the brand modern nodes.

    further considerations and contours for Oracle precise application Clusters

    in addition to configuring services to exploit your workloads, additionally accept as suitable with the consume of the following aspects in the event you installation Oracle RAC:

  • Scaling Your Oracle RAC Database—As mentioned, that you could add nodes and cases to your Oracle RAC environment the consume of Oracle cloning. if you resolve to not consume cloning, then that you can extend your database through the consume of the manual processes that are described in Chapter 10, "including and Deleting Nodes and situations on UNIX-based mostly systems" or Chapter 11, " adding and Deleting Nodes and cases on home windows-primarily based systems".

  • business manager—Use trade supervisor to administer your total Oracle RAC ambiance, no longer simply the Oracle RAC database. consume enterprise manager to create and modify services, and to delivery and quit the cluster database cases and the cluster database. enterprise manager has extra aspects as exact within the Part "Overview of using enterprise manager with Oracle actual utility Clusters".

  • healing manager (RMAN)—RMAN backs up, restores, and recovers datafiles, control information, server parameter data (SPFILEs) and archived redo logs. that you may consume RMAN with a media supervisor to returned up data to external storage. that you can additionally configure parallelism when backing up or recuperating Oracle RAC databases. In Oracle RAC, RMAN channels can subsist dynamically allocated across the entire Oracle RAC circumstances. Channel failover makes it feasible for failed operations on one node to continue on a different node. that you can consume RMAN in Oracle RAC from the Oracle enterprise manager Backup supervisor or from a command line.

  • automated undo management—automatically manages undo processing.

  • computerized segment space management (ASSM)—immediately manages aspect freelists and freelist companies.

  • locally managed tablespaces—Enhances space management efficiency.

  • Cluster Verification Utility (CVU)—Use CVU to examine the repute of your clusterware in case you journey problems or consume it each time you reconfigure your cluster.

  • Sequences—if you consume sequence numbers, then indelicate the time consume CACHE with the NOORDER option for top of the line sequence number generation performance. With the CACHE choice, despite the fact, you can likewise acquire gaps within the sequence numbers. in case your atmosphere cannot tolerate sequence quantity gaps, then consume the NOCACHE alternative or conform with pre-generating the sequence numbers. if your utility requires sequence number ordering but can tolerate gaps, then consume CACHE and ORDER to cache and order sequence numbers in Oracle RAC. if your application requires ordered sequence numbers with out gaps, then consume NOCACHE and ORDER. This combination has essentially the most evil sequel on efficiency in comparison to other caching and ordering combinations.

  • Indexes—if you consume indexes, trust options, such as reverse key indexes, to optimize index performance. reverse key indexes are particularly valuable you probably acquire conventional inserts to one side of an index, similar to indexes which are according to insert date.

  • Managing Oracle actual utility Clusters Environments

    This region describes here Oracle RAC ambiance management subject matters:

    Designing Oracle suitable application Clusters Environments

    believe performing here steps indelicate through the design and construction of functions that you're deploying on an Oracle RAC database. deem tuning:

  • The design and the application

  • The memory and that i/O

  • contention

  • The operating equipment

  • word:

    If an utility doesn't scale on an SMP computer, then poignant the utility to an Oracle RAC database can't enrich performance.

    agree with the usage of hash partitioning for insert-intensive online transaction processing (OLTP) purposes. Hash partitioning:

  • Reduces contention on concurrent inserts into a solitary database structure

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

  • Is transparent to the software

  • if you hash partitioned tables and indexes for OLTP environments, then that you may significantly enhance performance to your Oracle RAC database. word that you just can not consume index latitude scans on an index with hash partitioning.

    if you're the consume of sequence numbers, then always consume the CACHE choice. if you consume sequence numbers with the CACHE choice, then:

    Administrative apparatus for Oracle actual utility Clusters Environments

    Oracle permits you to administer a cluster database as a solitary device picture through commercial enterprise supervisor, SQL*Plus, or via Oracle RAC command-line interfaces reminiscent of Server ply (SRVCTL). that you would subsist able to likewise consume a few apparatus and utilities to exploit your Oracle RAC atmosphere and its add-ons as follows:

  • enterprise manager—enterprise supervisor has each the Database manage and Grid ply GUI interfaces for managing each solitary instance and Oracle RAC environments.

  • Cluster Verification Utility (CVU)—CVU is a command-line instrument for you to consume to examine a number cluster and Oracle RAC-certain components akin to shared storage instruments, networking configurations, apparatus requirements, and Oracle Clusterware, in addition to working system corporations and users. you can consume CVU for pre-installing exams as well as for post-setting up assessments of your cluster atmosphere. CVU is notably helpful indelicate through pre-setting up and throughout setting up of Oracle Clusterware and Oracle RAC components. The OUI runs CVU after Oracle Clusterware and the Oracle installing to check your environment.

  • Server manage (SRVCTL)—SRVCTL is a command-line interface for you to consume to exploit an Oracle RAC database from a solitary factor. you can consume SRVCTL to birth and obviate the database and circumstances and to delete or flux instances and features. that you may likewise consume SRVCTL to control configuration advice.

    See additionally:

    Appendix E for extra assistance about SRVCTL
  • Cluster ready capabilities control (CRSCTL)—CRSCTL is a command-line device so that you can consume to control Oracle Clusterware. that you may consume CRSCTL to delivery and obviate Oracle Clusterware. CRSCTL has many options akin to enabling online debugging,

  • Oracle Interface Configuration instrument (OIFCFG)—OIFCFG is a command-line device for both single-example Oracle databases and Oracle RAC environments so you might consume to earmark and de-allocate network interfaces to add-ons. that you would subsist able to additionally consume OIFCFG to direct accessories to manufacture consume of specific community interfaces and to retrieve component configuration suggestions.

  • OCR Configuration instrument (OCRCONFIG)—OCRCONFIG is a command-line device for OCR administration. that you can likewise consume the OCRCHECK and OCRDUMP utilities to troubleshoot configuration complications that acquire an sequel on the OCR.

  • Monitoring Oracle precise software Clusters Environments

    internet-based commercial enterprise supervisor Database control and Grid ply permit you to computer screen an Oracle RAC database. The enterprise manager Console is a essential point of manage for the Oracle atmosphere that you simply access by the consume of a graphical person interface (GUI). consume the enterprise manager Console to excite cluster database administration projects. consume commercial enterprise manager Grid control to administer dissimilar Oracle RAC databases. likewise word here aspects about monitoring Oracle RAC environments:

  • The international views, or GV$ views, are in accordance with V$ views. The catclustdb.sql script creates the GV$ views. race this script in case you don't create your database with DBCA. otherwise, DBCA runs this script for you.

  • Statspack is Oracle RAC-mindful.

    observe:

    as a substitute of the usage of Statspak, Oracle recommends that you consume the greater refined administration and monitoring elements of the Oracle Database 10g Diagnostic and Tuning packs which consist of the automated Database Diagnostic parade screen (ADDM).
  • Evaluating performance in Oracle suitable application Clusters Environments

    You don't deserve to execute special tuning for Oracle RAC; Oracle RAC scales with out special configuration adjustments. if your utility performed neatly on a single-example Oracle database, then it's going to operate neatly in an Oracle RAC environment. many of the tuning initiatives that you'd execute on a single-example Oracle database can likewise improve Oracle RAC database efficiency. this is very suitable in case your atmosphere required scalability throughout a more suitable variety of CPUs.

    some of the Oracle RAC performance elements are:

  • Dynamic useful resource Allocation

  • Cache Fusion permits A Simplified Tuning Methodology

  • You achieve not requisite to tune any parameters for Cache Fusion

  • No software-level tuning is quintessential

  • that you can consume a bottom-up tuning manner with essentially no impact on your current applications

  • extra unique efficiency facts


  • New Oracle VM Templates for Oracle real application Clusters Now obtainable | killexams.com real Questions and Pass4sure dumps

    New Oracle VM Templates for Oracle real utility Clusters Now available

    supply: Oracle supplier

    Oracle Corporation

    November 15, 2010 08:00 ET

    Simplifies Deployment of a extremely purchasable, Virtualized Database

    REDWOOD SHORES, CA--(Marketwire - November 15, 2010) - Oracle (NASDAQ: ORCL)

    news records

  • Enabling consumers to abruptly install a enormously accessible, virtualized database, Oracle today introduced the supply of latest Oracle VM Templates for Oracle Database 11g release 2 and Oracle precise application Clusters.
  • by artery of featuring pre-put in and pre-configured application photos, Oracle VM Templates supply an inventive approach to deploying a fully configured application stack and permit digital and cloud environments to subsist provisioned directly, with no trouble, always, and with simplified management.
  • the brand modern Oracle VM Templates for Oracle actual utility Clusters supply a speedily and straightforward artery to deploy a database cluster on Oracle VM for building, check and production environments. Clusters of any variety of nodes may likewise subsist constructed, and the entire installation is computerized, requesting minimal guidance from the user when visitors are booted.
  • Combining the merits of Oracle VM for x86 and Oracle precise utility Clusters presents a enormously accessible database cloud answer with indelicate the merits of a completely virtualized atmosphere.
  • the modern Oracle VM Templates are available in 32-bit or sixty four-bit device formats.
  • exciting compund of Virtualization and Clustering Speeds Time to Market and makes it feasible for larger Availability

  • Use of Oracle VM Templates vastly simplifies setting up and configuration, assisting reduce back preparatory and ongoing maintenance costs and allowing corporations to obtain faster time to market and reduce cost of operations.
  • by using deploying Oracle suitable application Clusters in Oracle VM environments with the brand modern templates, valued clientele can improvement from greater database availability. 
  • The combination of Oracle VM and Oracle actual software Clusters allows continual availability in the countenance of hardware and software screw ups, an impecunious lot bigger availability than would historically be acquired via hypervisor-handiest options from providers like VMware, that may handiest flux and restart failed virtual machines. 
  • Oracle VM Templates are likewise purchasable for Oracle purposes, Oracle Fusion Middleware, Oracle Database, Oracle Linux, Oracle Solaris and other Oracle items.
  • assisting Quote

  • "best Oracle presents the pleasing compund of clustering and virtualization," stated Wim Coekaerts, senior vp, Linux and Virtualization Engineering, Oracle. "the consume of an Oracle VM infrastructure mixed with the efficiency, scalability and resiliency of Oracle suitable application Clusters and Oracle VM Templates, they help customers tremendously in the reduction of deployment and operational charges while enabling a tremendously obtainable infrastructure."
  • helping elements

    About Oracle Oracle (NASDAQ: ORCL) is the realm's most finished, open, and integrated company application and hardware methods company. For more information about Oracle, delight talk over with their internet site at http://www.oracle.com.

    trademarks Oracle and Java are registered trademarks of Oracle and/or its affiliates. other names may subsist emblems of their respective homeowners.

    For an improved event using this site, delight improve to a contemporaneous web browser.


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    Understanding Oracle real Application Clusters (RAC) best practices | killexams.com real questions and Pass4sure dumps

    With finish users getting accustomed to instantaneous response times, Oracle, more than ever, is challenged to provide continuous availability to its database products. An essential instrument the folks at Redwood Shores acquire to assist them accomplish that is Oracle real Application Clusters (RAC).

    What is RAC? In a nutshell, it is a software instrument that allows a solitary database to subsist accessed by many Oracle programs. If one server fails, transactions can subsist redirected to another live server with a minimum of downtime.

    Oracle advertises RAC as a heal for many ailments. IT shops can misunderstand such marketing hype, however, and not recognize the cost and benefits of using RAC in a high availability (HA) environment.

    Let’s explore some Oracle RAC best practices and in the process shed some light on common mistakes users manufacture when using this cluster-based technology. In this Oracle RAC guide, we’ll select a gape at:

  • RAC planning best practices
  • RAC implementation best practices
  • RAC infrastructure considerations
  • Hardware architecture and RAC performance 
  • RAC backup and recovery best practices
  • Performance and tuning best practices
  • One of the most common mistakes with Oracle RAC is misunderstanding its functions and limitations. Oracle real Application Clusters is used as Part of a comprehensive capacity planning strategy, but the technology’s strengths and limitations are not always understood. Here is a list of the most common misperceptions about the technology.

    Oracle RAC is pattern for scalability

    Even though Oracle Corporation wants you to buy tiny “blade servers” and consume their grid computing solution for “horizontal scaling,” that’s not how most shops consume RAC. maintain in intuition that RAC is only a legitimate scalability option for very big IT shops that requisite more horsepower than a solitary server can deliver.

    Instead, it’s an Oracle best exercise to scale-up first, and then scale out by first structure up within a solitary server through “vertical scaling.” Only after you acquire saturated a big server achieve you requisite to consume RAC to “scale out” the application across multiple servers. Today, a solitary server’s memory and CPU horsepower can subsist significantly expanded compared with just several years ago, making it easier to add resources instead of plunking in a modern server to the RAC environment. In real-world environments, a solitary server can ply thousands of transactions per second. Only the world’s largest Oracle databases requisite to scale-out using RAC nodes.

    Oracle RAC is a standalone high-availability solution

    Remember that RAC only protects you against instance failure, and that’s only one of many components that can occasions an unplanned outage. For suitable continuous availability, they must deploy triple-mirrored disks (with a mean-time-to-failure rate expressed in centuries) and redundant network components.

    For complete availability on each RAC server node, you will want multiple host bus adapters, multiple network cards and multiple power sources. Just as they acquire failover at the instance layer, you requisite to purchase software to allow the multiple host bus adapter cards to automatically failover and issue a notification that one has failed.

    As they acquire noted, RAC systems require a cluster interconnect in order to accommodate RAM-to-RAM transfers of data blocks in the RCA cache fusion layer. This interconnect must subsist very fast, with high bandwidth and low latency. Interconnects include:

  • Dark fiber: Dense Wavelength Division Multiplexing (DWDM) technology
  • Infiniband
  • Myrinet
  • This cache fusion bottleneck is another intuition why RAC scale-out, or horizontal scalability, is problematic. If your cluster interconnect cannot ply the traffic, extra servers will actually humble your performance instead of helping it. The only artery around this problem is to change your entire application to accommodate RAC, or to purchase faster storage such as Solid situation Disk.

    Oracle RAC ensures speedily response time

    Response time for transactions is always important, but it’s especially essential for RAC databases. This is because of the connection wait-time that is used to detect whether a RAC node, or server, has failed. Consequently, you must arrangement to ensure that modern transactions are serviced in less than one second wall-clock time so that you can set a failover time of two seconds.

    Oracle RAC does not requisite a disaster recovery component

    Except in the rare cases where you can deploy Dense Wavelength Division Multiplexing (DWDM) technology, known as dim fiber, you still requisite to create a disaster recovery solution. Because RAC nodes are normally located within a few miles of each other, a natural disaster like a hurricane would still occasions a global outage. So it has become a RAC best exercise to likewise deploy a fast-failover geographical solution like Data Guard -- or better still, n-way Streams.

    Now that they understand the planning aspect of best practices, let’s select a closer gape at RAC best practices issues after they acquire implemented their modern database.

    Oracle RAC implementation best practices

    Operational RAC databases succeed many of the identical best practices as any Oracle database, but there are some that are unique to Oracle RAC systems. First, it’s an essential best exercise to arrangement RAC servers in a artery that minimizes the geographical distance between the RAC nodes while still keeping them separate, in order to avoid a failure of indelicate nodes.

    As a reference, you can select a gape at what I wrote on how to implement RAC implementation guidelines.

    In a busy RAC database, the hasten of the server interconnect is captious for speedily response times. It’s a commonly accepted best exercise to consume the fastest feasible interconnect, typically a fiber optics solution like dim fiber.

    Some shops will station RAC nodes in divorce buildings in the identical neighborhood, but with the advent of the superfast dim fiber interconnect, you can consume “Extended RAC” and station RAC nodes up to 100 miles apart. This allows you to combine high availability with disaster recovery.

    Dark fiber is rather expensive, however. To reduce costs, most shops adopt a best exercise where they combine RAC with disaster recovery solutions like n-way Streams replication.

    The entire point of RAC is to manufacture finish users automatically reconnect to a surviving server when one server fails. This is done either at the Web-server plane or with the Oracle Transparent Application Failover (TAF) option. Whichever instrument you choose, you should wait about three seconds before assuming that the server is dead and re-trying a modern RAC server.

    Next, let’s select a closer gape at specific RAC technical best practices.

    Oracle RAC interconnect best practices

    Since RAC is a manner in which many instances partake the identical database, shared data blocks are transferred between the servers using a high-speed interconnect called “cache fusion.” In order to maintain performance fast, it’s captious that you pay close attention to the interconnect layer and recall these points:

    RAC likes diminutive screen sizes, the interconnect must acquire extremely speedily network hardware, and RAC load balancing is captious to performance.

    Oracle RAC node load balancing best practices

    I disagree with Oracle’s exercise of load balancing using a least-loaded approach because of the overhead it lays on top of the cache fusion layer. In the real world, like-minded finish users are directed to the identical RAC server. If they acquire a RAC system with different types of finish users, they would want to load equilibrium according to their data needs. For example, customer processing might subsist on node one, order processing on node two, and product processing on node three. Grouping RAC finish users by data needs ensures that cache fusion overhead is minimized.

    Oracle RAC disk storage management best practices

    In order to implement a RAC system, you should consume a shared storage device because many servers must acquire concurrent access to the disks. A solitary instance database can, however, consume Direct Attached Storage (DAS), which is an array of inexpensive disks connected to a solitary server. You must now consume what is known as a Storage region Network (SAN). A SAN, which is more expensive and complex, is a disk array capable of connecting to many servers, usually through Fibre Channel. This requires a unique set of hardware, ranging from host bus adapters to the SAN itself. It’s essential that your DBA acquire complete erudition of the internals of the data storage layer.

    Oracle RAC screen size best practices

    It has become a best exercise in RAC to consume a diminutive 2 kilobyte screen size in order to minimize the “baggage” shipped across the cache fusion layer. Because the screen size is the unit of work, the smaller the screen size, the higher the granularity of data being transferred, with less overhead. If you acquire long rows (greater than 2 kilobytes), then you will want to fling to a 4 kilobyte screen size.

    The implementation of a RAC cluster is only the beginning, and it’s captious to constantly monitor the health of your RAC clusters so that you can spot and fix impending problems before you inconvenience your finish users.

    Oracle RAC monitoring best practices

    To ensure that a RAC node never experiences a global problem, a proper monitoring infrastructure is an absolute requirement. RAC databases rarely fail without warning. If the DBA understands the proper metrics to watch, he can create an alert system that notifies him of a looming problem so that he can fix it before the instance crashes.

    The DBA must monitor the cluster, the shared disk setup, ASM (or OCFS), the database instance, listeners, and more in-depth metrics such as cache coherency, interconnect latency, disk times from multiple systems, and a scope of other things.

    While higher-cost performance monitoring tools such as Oracle Grid Control can assist execute rudimentary RAC monitoring for beginners, a RAC DBA should acquire the coding skills to build his own RAC monitoring infrastructure using dictionary queries, dbms_scheduler and email alert mechanisms.

    Wrapping up the discussion of Oracle RAC best practices, let’s focus on the best artery to define job roles for a RAC database.

    Oracle RAC staffing best practices

    One best exercise for RAC databases is to always hire an experienced RAC DBA to manage your cluster, avoiding people who acquire had the RAC training but acquire no job experience.

    It’s essential to recognize that human resource costs are the most expensive Part of an Oracle shop. Over the decades, hardware costs acquire steadily fallen while manpower costs acquire remained the same.

    It’s essential to note that Oracle professionals with RAC skills command a hefty premium over an ordinary DBA. A recent Oracle salary survey notes that an detached DBA earns about $97,000 per year, whereas RAC experts commonly rate $140,000 a year. Those who manage multi-billion-dollar RAC databases typically command upwards of $250,000 per year.

    Sadly, there is no light artery to “grow your own” RAC DBA. The training courses are very expensive, and there is no substitute for real-world experience. And training your own DBA in RAC may manufacture him more marketable. It’s not uncommon to expend tens of thousands of dollars teaching RAC to your DBA only to lose him to a better job offer.

    Oracle RAC job role best practices

    There is a perpetual affray between systems administrators (SAs), who traditionally manage servers and disks, and the RAC DBAs who are accountable for managing the RAC database. There are likewise clearly defined job roles for network administrators, who are especially challenged in a RAC database environment to manage the cluster interconnect and packet shipping between servers.

    If your DBA is going to subsist held accountable for the performance of the RAC database, then it’s only impartial that he subsist given root access to the servers and disk storage subsystem. However, not every DBA will acquire the required computer science skills to manage a involved server and SAN environment, so each shop makes this determination on a case-by-case basis.

    Oracle RAC training best practices

    One of the confident ways to set your company up for an unplanned outage is to fail to train your SA, DBA and network administrator properly. SAN environments like EMC, Tagmastore and NetApp acquire involved architectures, and they frequently require training classes.

    Disk configuration is likewise challenging, and RAC will function only when using specific disk setups such as ASM, OCFS, RAW, or a third-party cluster file system. These tools require training classes.

    Network administrators must likewise receive training on how to work with the cluster interconnect, as well as specialized interconnects such as Infiniband and DWDM.

    Of indelicate those on a RAC staff, DBAs will acquire the greatest learning curve. They will acquire to understand how to set up and administer indelicate of the involved RAC components, including the clusterware and file system storage.

    Conclusion

    In summary, while RAC offers continuous availability, it’s not magic. There is a lot of work required to ensure that a RAC database is always available. Every RAC database has some unique properties, but there are some well-known perils and pitfalls as well. Using Oracle RAC best practices from other shops is a must for ensuring success. The vast majority of the best practices with RAC relate to properly planning the infrastructure and configuring and deploying the RAC database.

    About the author:

    Donald K. Burleson is a leading Oracle expert, with more than 25 years of DBA experience. He has authored more than 30 Oracle books, including five officially authorized O books on Oracle tuning. Burleson likewise manages a celebrated DBA website, www.dba-oracle.com.


    Nigeria: Oracle Database 11G Debuts, Pledges attribute Service | killexams.com real questions and Pass4sure dumps

    This latest generation of database builds on the innovations introduced in Oracle Database 11g to assist organizations deliver better information throughout the enterprise, at a higher attribute of service, and at a much lower cost.

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    How Garbage Collection Differs in the Three immense JVMs | killexams.com real questions and Pass4sure dumps

    (Note: If you’re interested in WebSphere in a production environment, check out Michael's upcoming webinar with The Bon-Ton Stores)

    Most articles about Garbage Collection ignore the fact that the Sun Hotspot JVM is not the only game in town. In fact whenever you acquire to work with either IBM WebSphere or Oracle WebLogic you will race on a different runtime. While the concept of Garbage Collection is the same, the implementation is not and neither are the default settings or how to tune it. This often leads to unexpected problems when running the first load tests or in the worst case when going live. So let’s gape at the different JVMs, what makes them unique and how to ensure that Garbage Collection is running smooth.

    The Garbage Collection ergonomics of the Sun Hotspot JVMEverybody believes to know how Garbage Collection works in the Sun Hotspot JVM, but lets select a closer gape for the purpose of reference.

    The memory model of the Sun Hotspot JVM

    The memory model of the Sun Hotspot JVM

    The Generational HeapThe Hotspot JVM is always using a Generational Heap. Objects are first allocated in the juvenile generation, specifically in the Eden area. Whenever the Eden space is complete a juvenile generation garbage collection is triggered. This will copy the few remaining live objects into the blank survivor space. In addition objects that acquire been copied to Survivor in the previous garbage collection will subsist checked and the live ones will subsist copied as well. The result is that objects only exist in one survivor, while eden and the other survivor is empty. This configuration of Garbage Collection is called copy collection. It is speedily as long as nearly indelicate objects acquire died. In addition allocation is always speedily because no fragmentation occurs. Objects that survive a couple of garbage collections are considered faded and are promoted into the Tenured/Old space.

    Tenured Generation GCsThe note and Sweep algorithms used in the Tenured space are different because they achieve not copy objects. As they acquire seen in one of my previous posts garbage collection takes longer the more objects are alive. Consequently GC runs in tenured are nearly always expensive which is why they want to avoid them. In order to avoid GCs they requisite to ensure that objects are only copied from juvenile to faded when they are permanent and in addition ensure that the tenured does not race full. Therefore generation sizing is the solitary most essential optimization for the GC in the Hotspot JVM. If they cannot obviate objects from being copied to Tenured space once in a while they can consume the Concurrent note and Sweep algorithm which collects objects concurrent to the application.

    Comparision of the different Garbage Collector Strategies

    Comparison of the different Garbage Collector Strategies

    While that shortens the suspensions it does not obviate them and they will occur more frequently. The Tenured space likewise suffers from another problem, fragmentation. Fragmentation leads to slower allocation, longer sweep phases and eventually out of memory errors when the holes procure too diminutive for immense objects.

    Java heap before and after compacting

    Java heap before and after compacting

    This is remedied by a compacting phase. The serial and parallel compacting GC execute compaction for every GC race in the Tenured space. essential to note is that, while the parallel GC performs compacting every time, it does not compact the entire Tenured heap but just the region that is worth the effort. Worth the pains means when the heap has reached a unavoidable plane of fragmentation. In contrast, the Concurrent note and Sweep does not compact at all. Once objects cannot subsist allocated anymore a serial major GC is triggered. When choosing the concurrent note and sweep strategy they acquire to subsist watchful of that side affect.

    The second immense tuning option is therefore the choice of the privilege GC strategy. It has immense implications for the impact the GC has on the application performance. The eventual and least known tuning option is around fragmentation and compacting. The Hotspot JVM does not provide a lot of options to tune it, so the only artery is to tune the code directly and reduce the number of allocations.

    There is another space in the Hotspot JVM that they indelicate came to esteem over the years, the Permanent Generation. It holds classes and string constants that are Part of those classes. While Garbage Collection is executed in the permanent generation, it only happens during a major GC. You might want to read up what a Major GC actually is, as it does not value a faded Generation GC. Because a major GC does not happen often and mostly nothing happens in the permanent generation, many people deem that the Hotspot JVM does not achieve garbage collection there at all.

    Over the years indelicate of us race into many different forms of the OutOfMemory situations in PermGen and you will subsist fortunate to hear that Oracle intends to achieve away with it in the future versions of Hotspot.

    Oracle JRockitNow that they had a gape at Hotspot, let us gape at the disagreement in the Oracle JRockit. JRockit is used by Oracle WebLogic Server and Oracle has announced that it will merge it with the Hotspot JVM in the future.

    Heap Strategy

    The biggest disagreement is the heap strategy itself. While Oracle JRockit does acquire a generational heap it likewise supports a so called continuous heap. In addition the generational heap looks different as well.

    Heap of the Oracle JRockit JVM

    Heap of the Oracle JRockit JVM

    The juvenile space is called Nursery and it only has two areas. When objects are first allocated they are placed in a so called maintain Area. Objects in the maintain region are not considered during garbage collection while indelicate other objects still alive are immediately promoted to tenured. That has major implications for the sizing of the Nursery. While you can configure how often objects are copied between the two survivors in the Hotspot JVM,  JRockit promotes objects in the second juvenile Generation GC.

    In addition to this disagreement JRockit likewise supports a completely continuous heap that does not distinguish between juvenile and faded objects. In unavoidable situations, like throughput orientated batch jobs, this results in better overall performance. The problem is that this is the default setting on a server JVM and often not the privilege choice. A typical Web Application is not throughput but response time orientated and you will requisite to explicitly elect the low pause time garbage collection mode or a generational garbage collection strategy.

    Mostly Concurrent note and SweepIf you elect Concurrent note and Sweep strategy you should subsist watchful about a couple of differences here as well. The mostly concurrent note aspect is divided into four parts:

  • Initial marking, where the root set of live objects is identified. This is done while the Java threads are paused.
  • Concurrent marking, where the references from the root set are followed in order to find and note the leisure of the live objects in the heap. This is done while the Java threads are running.
  • Precleaning, where changes in the heap during the concurrent note aspect are identified and any additional live objects are create and marked. This is done while the Java threads are running.
  • Final marking, where changes during the precleaning aspect are identified and any additional live objects are create and marked. This is done while the Java threads are paused.
  • The sweeping is likewise done concurrent to your application, but in contrast to Hotspot in two divorce steps. It is first sweeping the first half of the heap. During this aspect threads are allowed to earmark objects in the second half. After a short synchronization pause the second half is sweeped. This is followed by another short final synchronization pause. The JRockit algorithm therefore stops more often than the Sun Hotspot JVM, but the remark aspect should subsist shorter. Unlike the Hotspot JVM you can tune the CMS by defining the percentage of free memory that triggers a GC run.

    CompactingThe JRockit does compacting for indelicate Tenured Generation GCs, including the Concurrent note and Sweep. It does so in an incremental mode for portions of the heap. You can tune this with various options like percentage of heap that should subsist compacted each time or how many objects are compacted at max. In addition you can eddy off compacting completely or oblige a complete one for every GC. This means that compacting is a lot more tunable in the JRockit than in the Hotspot JVM and the optimum depends very much on the application itself and needs to subsist carefully tested.

    Thread Local AllocationHotspot does consume thread local allocation, but it is hard to find anything in the documentation about it or how to tune it. The JRockit uses this on default. This allows threads to earmark objects without any requisite for synchronization, which is beneficial for allocation speed. The size of a TLA can subsist configured and a big TLA can subsist beneficial for applications where multiple threads earmark a lot of objects. On the other hand a too big TLA can lead to more fragmentation. As a TLA is used exclusively by one thread, the size is naturally limited by the number of threads. Thus both decreasing and increasing the default can subsist proper or evil depending on your applications architecture.

    Large and diminutive objectsThe JRockit differentiates between big and diminutive objects during allocation. The limit for when an object is considered big depends on the JVM version, the heap size, the garbage collection strategy and the platform used. It is usually somewhere between 2 and 128 KB. big objects are allocated outside thread local region in in case of a generational heap directly in the faded generation. This makes a lot of sense when you start thinking about it. The juvenile generation uses a copy ccollection. At some point copying an object becomes more expensive than traversing it in ever garbage collection.

    No permanent GenerationAnd finally it needs to subsist renowned that the JRockit does not acquire a permanent generation. indelicate classes and string constants are allocated within the benchmark heap area. While that makes life easier on the configuration front it means that classes can subsist garbage collected immediately if not used anymore. In one of my future posts I will illustrate how this can lead to some hard to find performance problems.

    The IBM JVMThe IBM JVM shares a lot of characteristics with JRockit: The default heap is a continuous one. Especially in WebSphere installation this is often the initial occasions for evil performance. It differentiates between big and diminutive objects with the identical implications and uses thread local allocation on default. It likewise does not acquire a permanent generation, but while the IBM JVM likewise supports a generational heap model it looks more like Sun’s rather than JRockit.

    The IBM JVM generational heap

    The IBM JVM generational heap

    Allocate and Survivor act like Eden and Survivor of the Sun JVM. modern objects are allocated in one region and copied to the other on garbage collection. In contrast to JRockit the two areas are switched upon gc. This means that an object is copied multiple times between the two areas before it gets promoted to Tenured. like JRockit the IBM JVM has more options to tune the compaction phase. You can eddy it off or oblige it to happen for every GC. In contrast to JRockit the default triggers it due to a string of triggers but will then lead to a complete compaction. This can subsist changed to an incremental one via a configuration flag.

    ConclusionWe survey that while the three JVMs are essentially trying to achieve the identical goal, they achieve so via different strategies. This leads to different behaviour that needs tuning. With Java 7 Oracle will finally declare the G1 (Garbage First) production ready and the G1 is a different beast altogether, so wait tuned.

    If you’re interested in hearing me argue more about WebSphere in a production environment, then check out their upcoming webinar with The Bon-Ton Stores. I’ll subsist joined by Dan Gerard, VP of Technical & Web Services at Bon-Ton, to argue the challenges they’ve overcome in operating a involved Websphere production eCommerce site to deliver noteworthy web application performance and user experience. Reserve your seat today to hear me proceed into more detail about Websphere and production eCommerce environments.

    Related reading:

  • The impact of Garbage Collection on Java performance // In my eventual post I explained what a major...
  • Major GCs – Separating Myth from Reality In a recent post they acquire shown how the Java...
  • JDK6 Update 23 changes CMS Collection counters Stefan Frandl, Test Automation Team Lead at dynaTrace, recently tested...
  • The Top Java memory Problems – Part 1 // memory and Garbage Collection problems are still the most...
  • Troubleshooting response time problems – why you cannot trust your system metrics // Production Monitoring is about ensuring the stability and health...


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    Operations & Process Management: Principles & Practice for Strategic ImpactOperations & Process Management: Principles & Practice for Strategic Impact
    By Nigel Slack, Alistair Jones
    Publisher : Pearson (Feb 2018)
    ISBN10 : 129217613X
    ISBN13 : 9781292176130
    Our ISBN10 : 129217613X
    Our ISBN13 : 9781292176130
    Subject : Business & Economics
    Price : $75.00
    Computer Security: Principles and PracticeComputer Security: Principles and Practice
    By William Stallings, Lawrie Brown
    Publisher : Pearson (Aug 2017)
    ISBN10 : 0134794109
    ISBN13 : 9780134794105
    Our ISBN10 : 1292220619
    Our ISBN13 : 9781292220611
    Subject : Computer Science & Technology
    Price : $65.00
    Urban EconomicsUrban Economics
    By Arthur O’Sullivan
    Publisher : McGraw-Hill (Jan 2018)
    ISBN10 : 126046542X
    ISBN13 : 9781260465426
    Our ISBN10 : 1260084493
    Our ISBN13 : 9781260084498
    Subject : Business & Economics
    Price : $39.00
    Urban EconomicsUrban Economics
    By Arthur O’Sullivan
    Publisher : McGraw-Hill (Jan 2018)
    ISBN10 : 0078021782
    ISBN13 : 9780078021787
    Our ISBN10 : 1260084493
    Our ISBN13 : 9781260084498
    Subject : Business & Economics
    Price : $65.00
    Understanding BusinessUnderstanding Business
    By William G Nickels, James McHugh, Susan McHugh
    Publisher : McGraw-Hill (Feb 2018)
    ISBN10 : 126021110X
    ISBN13 : 9781260211108
    Our ISBN10 : 126009233X
    Our ISBN13 : 9781260092332
    Subject : Business & Economics
    Price : $75.00
    Understanding BusinessUnderstanding Business
    By William Nickels, James McHugh, Susan McHugh
    Publisher : McGraw-Hill (May 2018)
    ISBN10 : 1260682137
    ISBN13 : 9781260682137
    Our ISBN10 : 126009233X
    Our ISBN13 : 9781260092332
    Subject : Business & Economics
    Price : $80.00
    Understanding BusinessUnderstanding Business
    By William Nickels, James McHugh, Susan McHugh
    Publisher : McGraw-Hill (Jan 2018)
    ISBN10 : 1260277143
    ISBN13 : 9781260277142
    Our ISBN10 : 126009233X
    Our ISBN13 : 9781260092332
    Subject : Business & Economics
    Price : $77.00
    Understanding BusinessUnderstanding Business
    By William Nickels, James McHugh, Susan McHugh
    Publisher : McGraw-Hill (Jan 2018)
    ISBN10 : 1259929434
    ISBN13 : 9781259929434
    Our ISBN10 : 126009233X
    Our ISBN13 : 9781260092332
    Subject : Business & Economics
    Price : $76.00
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    By Peter W. Cardon
    Publisher : McGraw-Hill (Jan 2017)
    ISBN10 : 1260128474
    ISBN13 : 9781260128475
    Our ISBN10 : 1259921883
    Our ISBN13 : 9781259921889
    Subject : Business & Economics, Communication & Media
    Price : $39.00
    1Z0-0581Z0-058
    By Peter Cardon
    Publisher : McGraw-Hill (Feb 2017)
    ISBN10 : 1260147150
    ISBN13 : 9781260147155
    Our ISBN10 : 1259921883
    Our ISBN13 : 9781259921889
    Subject : Business & Economics, Communication & Media
    Price : $64.00
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