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1Z0-058 Oracle actual Application Clusters 11g(R) Release 2 and Grid Infrastructure Administration

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

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Test name : Oracle actual Application Clusters 11g(R) Release 2 and Grid Infrastructure Administration
Vendor name : Oracle
: 139 actual Questions

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Oracle Oracle actual Application Clusters

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Oracle Clusterware and Oracle legal software Clusters | killexams.com actual Questions and Pass4sure dumps

This chapter introduces Oracle Clusterware and Oracle precise application Clusters (Oracle RAC) by describing these items as well as a route 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 besides in brief describes workload management, services, and tall availability for each single-instance Oracle databases and Oracle RAC environments. This chapter comprises here themes:

Oracle Clusterware and Oracle actual application Clusters

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

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

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

Single-example Oracle databases Have a one-to-one relationship between the Oracle database and the illustration. Oracle RAC environments, although, Have 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 single server. Oracle RAC is the Oracle Database option that offers a single tackle photograph for multiple servers to entry one Oracle database. In Oracle RAC, each and every Oracle illustration usually runs on a sever server.

Oracle RAC is a special technology that provides extreme availability and scalability for vulgar software varieties. The Oracle RAC infrastructure is besides a key component for enforcing the Oracle commercial enterprise grid computing architecture. Having dissimilar cases entry a single database prevents the server from being a single point of failure. Oracle RAC enables you to amalgamate smaller commodity servers right into a cluster to create scalable environments that aid mission crucial company applications. applications that you installation on Oracle RAC databases can role 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 breathe certain collectively to role 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 Have to dwell on shared storage. The Oracle Clusterware requires that every node breathe linked to a personal network by the expend of a personal interconnect.

The inner most interconnect that Oracle Clusterware requires is a sever community that you just configure between the cluster nodes. This interconnect, which is required by means of Oracle RAC, can besides breathe the identical community that the clusterware makes expend of, however the interconnect should no longer breathe purchasable through nodes that don't look to breathe a fraction of the cluster.

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

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

The Oracle Clusterware architecture helps extreme 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, vulgar Oracle techniques are under the wield of the Oracle clusterware. The Oracle Clusterware besides provides an utility programming interface (API) that allows you to control different Oracle processes with Oracle Clusterware.

Oracle Clusterware application component Processing particulars

The Oracle Clusterware contains a brace of inheritance tactics that facilitate cluster operations. The Cluster Synchronization service (CSS), suffer administration (EVM), and Oracle Cluster components communicate with other cluster fraction layers within the different cases in the equal cluster database ambiance. These components are besides the main verbal exchange hyperlinks between the Oracle Clusterware extreme 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 valuable Oracle Clusterware accessories. This listing includes these components which are procedures on Unix and Linux working techniques or functions on home windows.


On home windows-based mostly working techniques, most of the add-ons are threads of the Oracle process in its Place of sever strategies.
  • Cluster Synchronization capabilities (CSS)—Manages the cluster configuration by route 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 extreme 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 create 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 expend 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)



    racgmain, racgimon

    racgmain.exe racgimon.exe

    Oracle Notification service (ONS)



    experience manager

    evmd (r), evmd.bin, evmlogger


    evmlogger.exe, evmd.exe

    Cluster in a position

    crsd.bin (r)



    Cluster Synchronization capabilities

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



    The Oracle Clusterware software add-ons

    When Oracle Clusterware operates, a brace of platform-certain methods or features will besides breathe 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 extreme 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. commemorate that this technique best looks on structures that don't expend dealer clusterware with Oracle Clusterware.

  • notice:

    Oracle RAC on Linux platforms can Have multiple threads that look as sever methods with sever procedure identifiers. Oracle Clusterware capabilities on windows-based mostly techniques

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

  • OracleCRService—Performs tall 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 besides 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 expend dealer clusterware with Oracle Clusterware.

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

    An Oracle RAC database is a logically or physically shared every diminutive thing database. vulgar datafiles, control info, PFILEs, and redo log files in Oracle RAC environments need to live on cluster-conscious shared disks so that vulgar of the cluster database situations can entry them. vulgar the situations must besides participate the selfsame interconnect. additionally, Oracle RAC databases can participate the identical interconnect that Oracle Clusterware makes expend of.

    as a result of an Oracle RAC database makes expend of a shared every diminutive thing architecture, Oracle RAC requires cluster-aware storage for vulgar database data. it's your option as to the route to configure your disk, but you need to expend 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 besides additionally expend 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 breathe used on a variety of storage architectures. An Oracle RAC database can Have as much as 100 instances. reckoning on your platform, which you could expend 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 specimen besides has:

    All nodes in an Oracle RAC environment should hook up with a indigenous belt network (LAN) to allow users and functions to access the database. purposes may soundless expend 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 extreme availability traits. Oracle web functions allows the weight balancing of utility connections across vulgar 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 breathe DBAs, builders, software users, energy users, akin to data miners who create their personal searches, and so on.

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


    do not to create expend 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 name and IP address, you Have to besides assign a digital host name and an IP wield to each and every node. The digital host name or VIP may soundless breathe used to connect with the database example. for example, you might enter the digital host name CRM in the wield listing of the tnsnames.ora file.

    A virtual IP wield is an alternate public tackle that client connections expend as an alternative of the run-of-the-mill public IP handle. To configure VIP addresses, you deserve to reserve a spare IP wield for every node that makes expend 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 vulgar 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 Have two or greater database cases that every accommodate remembrance buildings and history procedures. An Oracle RAC database has the selfsame 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 dote another instance's view in the identical Oracle RAC database; the view is a single system graphic of the atmosphere.

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


    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 create certain that each Oracle RAC database instance obtains the shroud that it should fulfill a question or transaction, Oracle RAC situations expend 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 shroud using a worldwide aid listing (GRD). The GRD contents are allotted throughout vulgar the lively cases, which comfortably increases the measurement of the device global belt for an Oracle RAC instance.

    After one illustration caches records, every other specimen in the selfsame cluster database can purchase a shroud graphic from one other specimen in the equal database faster than by means of analyzing the shroud from disk. for this reason, Cache Fusion moves existing blocks between situations rather than re-reading the blocks from disk. When a consistent shroud is required or a modified shroud is required on another illustration, Cache Fusion transfers the shroud photograph without delay between the affected cases. Oracle RAC uses the deepest interconnect for inter-instance communication and shroud 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 expend community connected Storage (NAS), then you are required to configure a 2nd deepest community. entry to this network is usually controlled by route of the supplier's utility. The deepest community makes expend 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 extreme Availability

    should you amalgamate Oracle Clusterware and Oracle RAC, which you can obtain dazzling scalability and tall availability. The Oracle Clusterware achieves this the expend of the components that this fraction describes under right here matter matters:

    The Oracle Clusterware balloting Disk and Oracle Cluster Registry

    The Oracle Clusterware requires right here two faultfinding info:

  • vote casting Disk—Manages cluster membership by the expend of a health examine and arbitrates cluster ownership among the many cases in case of network disasters. Oracle RAC makes expend 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 Have an odd variety of vote casting disks, akin to three, 5, etc. if you define a single vote casting disk, then you should definitely expend 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 besides 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 vulgar of the nodes on your cluster. The Oracle Clusterware can multiplex the OCR and Oracle recommends that you expend this role to create unavoidable cluster extreme 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 wield Utility (SRVCTL), or the Database Configuration aide (DBCA).

  • be aware:

    both the vote casting disks and the OCRs Have 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 tall Availability and the application Programming Interface

    Oracle Clusterware offers a tall availability application programming interface (API) so you might expend to enable Oracle Clusterware to control functions or approaches that quicken a cluster. This makes it practicable for you to give extreme availability for vulgar your functions. The Oracle Clusterware with ASM makes it practicable for you to create a consolidated pool of storage to steer both the single-instance Oracle databases and the Oracle RAC databases which are operating on your cluster.

    To maintain extreme availability, Oracle Clusterware add-ons can respond to status changes to restart functions and tactics based on described extreme availability suggestions. in addition, that you can expend the Oracle Clusterware tall availability framework by route of registering your applications with Oracle Clusterware and configuring the clusterware to start, stop, or relocate your utility methods. this is, you can create custom functions tremendously obtainable through the expend 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 besides whirl into unreachable and community interfaces are sluggish or non-practical.

    Workload management with Oracle actual 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 energetic configuration. Oracle Database 10g with Oracle RAC contains many features that may multiply 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 expend information safeguard or Streams. Workload management contains here components:

  • excessive Availability Framework—The Oracle RAC extreme availability framework enables the Oracle Database to retain accessories in a running status consistently. Oracle extreme 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 besides 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 End users. The scope of Oracle extreme availability spans from the restarting of stopped Oracle approaches in an Oracle database instance to failing over the processing of an entire specimen 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 route 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 labor with the weight balancing counsel. purposes can expend 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 traffic grid vision. capabilities are entities for you to profile in Oracle RAC databases. features enable you to community database workloads and route the labor to the optimal situations that are assigned to system the carrier. in addition, that you could expend functions to profile the elements that Oracle assigns to process workloads and to computer screen workload substances. applications that you assign to functions transparently acquire the defined workload administration features, together with tall 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 expend within an illustration. Some database features are additionally integrated with Oracle Streams, advanced Queuing, to achieve queue Place transparency, and the Oracle Scheduler, to map capabilities to unavoidable job courses.

    In Oracle RAC databases, the service performance rules that you just configure wield the quantity of labor that Oracle allocates to every attainable specimen for that provider. As you extend your database by route 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 vulgar of the running cases that present the carrier. you should definitely profile the route you want connections to breathe balanced within the service definition. despite the fact, you Have 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 belt 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 right into a directory constitution, which may besides breathe 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 need to quicken 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 quicken 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 touchstone 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 breathe fraction of your installation. One IP wield is for the deepest interconnect and the other is for the common public interconnect. The third IP address is the virtual IP tackle that purchasers will expend to connect with every example.

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


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

    The Oracle RAC application is disbursed as a fraction 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 besides breathe referred to as Oracle_home, this is rupture 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 breathe a fraction 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 Have to first installation Oracle Clusterware earlier than setting up Oracle RAC. After Oracle Clusterware is operational, that you would breathe able to expend OUI to install the Oracle database utility with the Oracle RAC add-ons. vulgar 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 aide (NETCA) to configure the community for your Oracle RAC environment.

    Oracle recommends that you simply select ASM during the setting up to simplify storage management; ASM instantly manages the storage of vulgar database files within disk businesses. which you can besides configure capabilities right through setting up, counting on your processing necessities. if you are the usage of the Oracle Database 10g common version, then you definately ought to expend ASM for storing vulgar 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 vulgar circumstances in an Oracle RAC environment, except the database is in restricted mode.

    Cloning Oracle Clusterware and Oracle RAC application in Grid Environments

    This belt in short summarizes the tactics for deploying Oracle RAC in grid environments that Have 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 role the cloning tactics which are summarized in this section, mention to the Oracle commonplace Installer and OPatch consumer's ebook.which you could additionally expend traffic manager Grid wield to discharge 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, vulgar root scripts should Have quicken efficiently on the node from which you're extending your cluster database. to create expend 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 recent node's Oracle Clusterware domestic. On home windows-based mostly programs you need to create zip info. Then on UNIX-based mostly systems create the necessary users and companies on the brand recent nodes. On home windows-based techniques, you accomplish not need to create users and corporations, however the user that performs the cloning should breathe the equal consumer that performed the setting up.

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

    if you Have not already created a database, then which you can quicken the Database Configuration aide (DBCA) to create one. at last, commemorate the submit-cloning procedures to comprehensive the extension of your Oracle RAC ambiance onto the brand recent nodes.

    further considerations and contours for Oracle precise application Clusters

    in addition to configuring services to exploit your workloads, additionally accept as legal with the expend 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 expend of Oracle cloning. if you settle to not expend cloning, then that you can extend your database through the expend 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 traffic supervisor to administer your total Oracle RAC ambiance, no longer simply the Oracle RAC database. expend enterprise manager to create and modify services, and to delivery and discontinue the cluster database cases and the cluster database. enterprise manager has extra aspects as exact within the fraction "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 expend 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 breathe dynamically allocated across the entire Oracle RAC circumstances. Channel failover makes it practicable for failed operations on one node to continue on a different node. that you can expend 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 facet 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 expend it each time you reconfigure your cluster.

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

  • Indexes—if you expend indexes, confidence options, such as transpose key indexes, to optimize index performance. transpose key indexes are particularly valuable you probably Have conventional inserts to one side of an index, similar to indexes which are according to insert date.

  • Managing Oracle actual utility Clusters Environments

    This belt describes here Oracle RAC ambiance management matter matters:

    Designing Oracle legal application Clusters Environments

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

  • The design and the application

  • The remembrance and that i/O

  • contention

  • The operating equipment

  • word:

    If an utility doesn't scale on an SMP computer, then stirring 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 single 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 expend index latitude scans on an index with hash partitioning.

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

    Administrative tackle for Oracle actual utility Clusters Environments

    Oracle permits you to administer a cluster database as a single device picture through commercial enterprise supervisor, SQL*Plus, or via Oracle RAC command-line interfaces reminiscent of Server wield (SRVCTL). that you would breathe able to besides expend a few tackle 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 wield GUI interfaces for managing each single instance and Oracle RAC environments.

  • Cluster Verification Utility (CVU)—CVU is a command-line appliance for you to expend to examine a number cluster and Oracle RAC-certain components akin to shared storage instruments, networking configurations, tackle requirements, and Oracle Clusterware, in addition to working system corporations and users. you can expend CVU for pre-installing exams as well as for post-setting up assessments of your cluster atmosphere. CVU is notably helpful vulgar 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 expend to exploit an Oracle RAC database from a single factor. you can expend SRVCTL to birth and avert the database and circumstances and to delete or flux instances and features. that you may besides expend 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 expend to control Oracle Clusterware. that you may expend CRSCTL to delivery and avert Oracle Clusterware. CRSCTL has many options akin to enabling online debugging,

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

  • OCR Configuration appliance (OCRCONFIG)—OCRCONFIG is a command-line device for OCR administration. that you can besides expend the OCRCHECK and OCRDUMP utilities to troubleshoot configuration complications that Have an result on the OCR.

  • Monitoring Oracle precise software Clusters Environments

    internet-based commercial enterprise supervisor Database control and Grid wield permit you to computer screen an Oracle RAC database. The enterprise manager Console is a valuable point of manage for the Oracle atmosphere that you simply access by the expend of a graphical person interface (GUI). expend the enterprise manager Console to rouse cluster database administration projects. expend commercial enterprise manager Grid control to administer dissimilar Oracle RAC databases. besides 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. quicken this script in case you don't create your database with DBCA. otherwise, DBCA runs this script for you.

  • Statspack is Oracle RAC-mindful.


    as a substitute of the usage of Statspak, Oracle recommends that you expend 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 legal application Clusters Environments

    You don't deserve to discharge 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 discharge on a single-example Oracle database can besides ameliorate Oracle RAC database efficiency. this is very legal 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 accomplish not need to tune any parameters for Cache Fusion

  • No software-level tuning is quintessential

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

  • extra unique efficiency facts

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

    New Oracle VM Templates for Oracle actual 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 route 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 breathe provisioned directly, with no trouble, always, and with simplified management.
  • the brand recent Oracle VM Templates for Oracle actual utility Clusters supply a swiftly and straightforward route to deploy a database cluster on Oracle VM for building, check and production environments. Clusters of any variety of nodes may besides breathe constructed, and the whole 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 vulgar the merits of a completely virtualized atmosphere.
  • the recent Oracle VM Templates are available in 32-bit or sixty four-bit device formats.
  • exciting blend of Virtualization and Clustering Speeds Time to Market and makes it practicable for larger Availability

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

  • "best Oracle presents the pleasing blend of clustering and virtualization," stated Wim Coekaerts, senior vp, Linux and Virtualization Engineering, Oracle. "the expend of an Oracle VM infrastructure mixed with the efficiency, scalability and resiliency of Oracle legal 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, gladden 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 breathe emblems of their respective homeowners.

    For an improved event using this site, gladden ameliorate to a synchronous web browser.

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

    With End users getting accustomed to instantaneous response times, Oracle, more than ever, is challenged to provide continuous availability to its database products. An valuable appliance the folks at Redwood Shores Have to back them accomplish that is Oracle actual Application Clusters (RAC).

    What is RAC? In a nutshell, it is a software appliance that allows a single database to breathe accessed by many Oracle programs. If one server fails, transactions can breathe 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 tall availability (HA) environment.

    Let’s explore some Oracle RAC best practices and in the process shed some light on common mistakes users create when using this cluster-based technology. In this Oracle RAC guide, we’ll select a survey 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 actual Application Clusters is used as fraction 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 example for scalability

    Even though Oracle Corporation wants you to buy tiny “blade servers” and expend their grid computing solution for “horizontal scaling,” that’s not how most shops expend RAC. uphold in intellect that RAC is only a legitimate scalability option for very large IT shops that need more horsepower than a single server can deliver.

    Instead, it’s an Oracle best rehearse to scale-up first, and then scale out by first edifice up within a single server through “vertical scaling.” Only after you Have saturated a large server accomplish you need to expend RAC to “scale out” the application across multiple servers. Today, a single server’s remembrance and CPU horsepower can breathe significantly expanded compared with just several years ago, making it easier to add resources instead of plunking in a recent server to the RAC environment. In real-world environments, a single server can wield thousands of transactions per second. Only the world’s largest Oracle databases need 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 legal 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 Have failover at the instance layer, you need to purchase software to allow the multiple host bus adapter cards to automatically failover and issue a notification that one has failed.

    As they Have 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 breathe very fast, with tall bandwidth and low latency. Interconnects include:

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

    Oracle RAC ensures swiftly response time

    Response time for transactions is always important, but it’s especially valuable 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 manner to ensure that recent 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 need a catastrophe recovery component

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

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

    Oracle RAC implementation best practices

    Operational RAC databases supervene many of the selfsame best practices as any Oracle database, but there are some that are unique to Oracle RAC systems. First, it’s an valuable best rehearse to manner RAC servers in a route that minimizes the geographical distance between the RAC nodes while soundless keeping them separate, in order to avoid a failure of vulgar nodes.

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

    In a industrious RAC database, the quicken of the server interconnect is faultfinding for swiftly response times. It’s a commonly accepted best rehearse to expend the fastest practicable interconnect, typically a fiber optics solution dote shadowy fiber.

    Some shops will Place RAC nodes in sever buildings in the selfsame neighborhood, but with the advent of the superfast shadowy fiber interconnect, you can expend “Extended RAC” and Place RAC nodes up to 100 miles apart. This allows you to combine tall availability with catastrophe recovery.

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

    The whole point of RAC is to create End users automatically reconnect to a surviving server when one server fails. This is done either at the Web-server flush or with the Oracle Transparent Application Failover (TAF) option. Whichever appliance you choose, you should wait about three seconds before assuming that the server is deceased and re-trying a recent RAC server.

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

    Oracle RAC interconnect best practices

    Since RAC is a manner in which many instances participate the selfsame database, shared data blocks are transferred between the servers using a high-speed interconnect called “cache fusion.” In order to uphold performance fast, it’s faultfinding that you pay nigh attention to the interconnect layer and remember these points:

    RAC likes small shroud sizes, the interconnect must Have extremely swiftly network hardware, and RAC load balancing is faultfinding to performance.

    Oracle RAC node load balancing best practices

    I disagree with Oracle’s rehearse of load balancing using a least-loaded approach because of the overhead it lays on top of the cache fusion layer. In the actual world, like-minded End users are directed to the selfsame RAC server. If they Have a RAC system with different types of End users, they would want to load equilibrium according to their data needs. For example, customer processing might breathe on node one, order processing on node two, and product processing on node three. Grouping RAC End 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 expend a shared storage device because many servers must Have concurrent access to the disks. A single instance database can, however, expend Direct Attached Storage (DAS), which is an array of inexpensive disks connected to a single server. You must now expend what is known as a Storage belt 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 valuable that your DBA Have complete learning of the internals of the data storage layer.

    Oracle RAC shroud size best practices

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

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

    While higher-cost performance monitoring tools such as Oracle Grid Control can back discharge rudimentary RAC monitoring for beginners, a RAC DBA should Have 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 route to define job roles for a RAC database.

    Oracle RAC staffing best practices

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

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

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

    Sadly, there is no simple route 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 create 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 answerable for managing the RAC database. There are besides 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 breathe held answerable for the performance of the RAC database, then it’s only dispassionate that he breathe given root access to the servers and disk storage subsystem. However, not every DBA will Have the required computer science skills to manage a tangled server and SAN environment, so each shop makes this determination on a case-by-case basis.

    Oracle RAC training best practices

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

    Disk configuration is besides challenging, and RAC will role 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 besides receive training on how to labor with the cluster interconnect, as well as specialized interconnects such as Infiniband and DWDM.

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


    In summary, while RAC offers continuous availability, it’s not magic. There is a lot of labor 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 besides manages a well-liked DBA website, www.dba-oracle.com.

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

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    How Garbage Collection Differs in the Three expansive JVMs | killexams.com actual 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 Have to labor with either IBM WebSphere or Oracle WebLogic you will quicken 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 survey 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 survey for the purpose of reference.

    The  remembrance model of the Sun Hotspot JVM

    The remembrance model of the Sun Hotspot JVM

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

    Tenured Generation GCsThe heed and Sweep algorithms used in the Tenured space are different because they accomplish not copy objects. As they Have 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 need to ensure that objects are only copied from young to feeble when they are permanent and in addition ensure that the tenured does not quicken full. Therefore generation sizing is the single most valuable optimization for the GC in the Hotspot JVM. If they cannot avert objects from being copied to Tenured space once in a while they can expend the Concurrent heed 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 avert them and they will occur more frequently. The Tenured space besides suffers from another problem, fragmentation. Fragmentation leads to slower allocation, longer sweep phases and eventually out of remembrance errors when the holes secure too small for expansive 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 discharge compaction for every GC quicken in the Tenured space. valuable to note is that, while the parallel GC performs compacting every time, it does not compact the whole Tenured heap but just the belt that is worth the effort. Worth the application means when the heap has reached a unavoidable flush of fragmentation. In contrast, the Concurrent heed and Sweep does not compact at all. Once objects cannot breathe allocated anymore a serial major GC is triggered. When choosing the concurrent heed and sweep strategy they Have to breathe aware of that side affect.

    The second expansive tuning option is therefore the choice of the right GC strategy. It has expansive implications for the impact the GC has on the application performance. The terminal 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 route is to tune the code directly and reduce the number of allocations.

    There is another space in the Hotspot JVM that they vulgar came to dote over the years, the Permanent Generation. It holds classes and string constants that are fraction 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 spell a feeble Generation GC. Because a major GC does not befall often and mostly nothing happens in the permanent generation, many people assume that the Hotspot JVM does not accomplish garbage collection there at all.

    Over the years vulgar of us quicken into many different forms of the OutOfMemory situations in PermGen and you will breathe joyful to hear that Oracle intends to accomplish away with it in the future versions of Hotspot.

    Oracle JRockitNow that they had a survey at Hotspot, let us survey at the discrepancy 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 discrepancy is the heap strategy itself. While Oracle JRockit does Have a generational heap it besides 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 young space is called Nursery and it only has two areas. When objects are first allocated they are placed in a so called uphold Area. Objects in the uphold belt are not considered during garbage collection while vulgar other objects soundless 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 young Generation GC.

    In addition to this discrepancy JRockit besides supports a completely continuous heap that does not distinguish between young and feeble objects. In unavoidable situations, dote 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 right choice. A typical Web Application is not throughput but response time orientated and you will need to explicitly select the low intermission time garbage collection mode or a generational garbage collection strategy.

    Mostly Concurrent heed and SweepIf you select Concurrent heed and Sweep strategy you should breathe aware about a brace of differences here as well. The mostly concurrent heed facet 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 heed the repose 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 heed facet are identified and any additional live objects are establish and marked. This is done while the Java threads are running.
  • Final marking, where changes during the precleaning facet are identified and any additional live objects are establish and marked. This is done while the Java threads are paused.
  • The sweeping is besides done concurrent to your application, but in contrast to Hotspot in two sever steps. It is first sweeping the first half of the heap. During this facet threads are allowed to arrogate objects in the second half. After a short synchronization intermission 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 facet should breathe shorter. Unlike the Hotspot JVM you can tune the CMS by defining the percentage of free remembrance that triggers a GC run.

    CompactingThe JRockit does compacting for vulgar Tenured Generation GCs, including the Concurrent heed and Sweep. It does so in an incremental mode for portions of the heap. You can tune this with various options dote percentage of heap that should breathe compacted each time or how many objects are compacted at max. In addition you can whirl off compacting completely or constrain 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 breathe carefully tested.

    Thread Local AllocationHotspot does expend thread local allocation, but it is arduous to find anything in the documentation about it or how to tune it. The JRockit uses this on default. This allows threads to arrogate objects without any need for synchronization, which is profitable for allocation speed. The size of a TLA can breathe configured and a large TLA can breathe profitable for applications where multiple threads arrogate a lot of objects. On the other hand a too large 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 breathe edifying or bad depending on your applications architecture.

    Large and small objectsThe JRockit differentiates between large and small objects during allocation. The confine for when an expostulate is considered large 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. large objects are allocated outside thread local belt in in case of a generational heap directly in the feeble generation. This makes a lot of sense when you start thinking about it. The young generation uses a copy ccollection. At some point copying an expostulate becomes more expensive than traversing it in ever garbage collection.

    No permanent GenerationAnd finally it needs to breathe notable that the JRockit does not Have a permanent generation. vulgar classes and string constants are allocated within the run-of-the-mill heap area. While that makes life easier on the configuration front it means that classes can breathe garbage collected immediately if not used anymore. In one of my future posts I will illustrate how this can lead to some arduous 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 bad performance. It differentiates between large and small objects with the selfsame implications and uses thread local allocation on default. It besides does not Have a permanent generation, but while the IBM JVM besides supports a generational heap model it looks more dote Sun’s rather than JRockit.

    The IBM JVM generational heap

    The IBM JVM generational heap

    Allocate and Survivor act dote Eden and Survivor of the Sun JVM. recent objects are allocated in one belt and copied to the other on garbage collection. In contrast to JRockit the two areas are switched upon gc. This means that an expostulate is copied multiple times between the two areas before it gets promoted to Tenured. dote JRockit the IBM JVM has more options to tune the compaction phase. You can whirl it off or constrain it to befall for every GC. In contrast to JRockit the default triggers it due to a progression of triggers but will then lead to a complete compaction. This can breathe changed to an incremental one via a configuration flag.

    ConclusionWe contemplate that while the three JVMs are essentially trying to achieve the selfsame goal, they accomplish 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 debate more about WebSphere in a production environment, then check out their upcoming webinar with The Bon-Ton Stores. I’ll breathe joined by Dan Gerard, VP of Technical & Web Services at Bon-Ton, to debate the challenges they’ve overcome in operating a tangled Websphere production eCommerce site to deliver much web application performance and user experience. Reserve your seat today to hear me depart into more detail about Websphere and production eCommerce environments.

    Related reading:

  • The impact of Garbage Collection on Java performance // In my terminal post I explained what a major...
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  • JDK6 Update 23 changes CMS Collection counters Stefan Frandl, Test Automation Team Lead at dynaTrace, recently tested...
  • The Top Java remembrance Problems – fraction 1 // remembrance and Garbage Collection problems are soundless the most...
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