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This chapter introduces Oracle Clusterware and Oracle true utility Clusters (Oracle RAC) through describing these products in addition to how to installation, administer, and installation them. This chapter describes Oracle Clusterware and Oracle RAC architectures as well because the application and hardware add-ons for both of those products. This chapter additionally in brief describes workload management, services, and towering availability for each single-illustration Oracle databases and Oracle RAC environments. This chapter includes here themes:Oracle Clusterware and Oracle actual application Clusters
A cluster comprises numerous interconnected computer systems or servers that look dote they are one server to finish users and purposes. Oracle Database 10g steady utility Clusters (Oracle RAC) allows the clustering of the Oracle Database. Oracle RAC uses Oracle Clusterware for the infrastructure to bind dissimilar servers in order that they operate as a single gadget.
Oracle Clusterware is a transportable cluster administration solution it truly is built-in with the Oracle database. The Oracle Clusterware is additionally a required element for the usage of Oracle RAC. additionally, Oracle Clusterware allows both single-example Oracle databases and Oracle RAC databases to design employ of the Oracle towering availability infrastructure. The Oracle Clusterware enables you to create a clustered pool of storage to be used by means of any aggregate of single-instance and Oracle RAC databases.
Oracle Clusterware is the most efficient clusterware that you exigency for most systems on which Oracle RAC operates. you can additionally employ clusterware from other providers if the clusterware is certified for Oracle RAC.
Single-example Oracle databases tolerate a one-to-one relationship between the Oracle database and the example. Oracle RAC environments, besides the fact that children, tolerate a one-to-many relationship between the database and instances. In Oracle RAC environments, the cluster database situations access one database. The mixed processing power of the multiple servers can supply more suitable throughput and scalability than is attainable from a single server. Oracle RAC is the Oracle Database alternative that gives a single apparatus photograph for varied servers to access one Oracle database. In Oracle RAC, every Oracle instance constantly runs on a separate server.
Oracle RAC is a special know-how that gives towering availability and scalability for bar no one at all utility forms. The Oracle RAC infrastructure is additionally a key element for imposing the Oracle enterprise grid computing structure. Having diverse situations access a single database prevents the server from being a single factor of failure. Oracle RAC permits you to coalesce smaller commodity servers into a cluster to create scalable environments that usher mission essential enterprise functions. applications that you just install on Oracle RAC databases can function with out code changes.The Oracle Clusterware architecture and Oracle Clusterware Processing
The Oracle Clusterware is application that once installed on servers running the equal operating device, allows the servers to be bound collectively to function as if they tolerate been one server. The Oracle Clusterware requires two clusterware accessories: a balloting disk to record node membership tips and the Oracle Cluster Registry (OCR) to checklist cluster configuration information. The voting disk and the OCR should dwell on shared storage. The Oracle Clusterware requires that each and every node be connected to a personal network by means of a non-public interconnect.
The inner most interconnect that Oracle Clusterware requires is a separate network that you simply configure between the cluster nodes. This interconnect, which is required via Oracle RAC, can moreover be the same network that the clusterware uses, but the interconnect should not be available via nodes that aren't fragment of the cluster.
Oracle recommends that you simply configure a redundant interconnect to evade the interconnect from being a single aspect of failure. Oracle additionally recommends that you simply employ consumer Datagram Protocol (UDP) on a Gigabit Ethernet in your cluster interconnect. Crossover cables don't look to be supported for employ with Oracle Clusterware or Oracle RAC databases.
The Oracle Clusterware manages node membership and prevents split intelligence syndrome during which two or more situations attempt to control the database. this may turn up in situations where there is a damage in verbal exchange between nodes during the interconnect.
The Oracle Clusterware architecture supports unreasonable availability via instantly restarting stopped accessories. The Oracle Clusterware can immediately re-start a node to obviate complications with that node from affecting the supply of the repose of the Oracle RAC environment. In an Oracle RAC ambiance, bar no one at all Oracle techniques are under the manage of the Oracle clusterware. The Oracle Clusterware additionally offers an software programming interface (API) that permits you to manage different Oracle approaches with Oracle Clusterware.Oracle Clusterware application fragment Processing particulars
The Oracle Clusterware comprises several inheritance methods that facilitate cluster operations. The Cluster Synchronization service (CSS), event management (EVM), and Oracle Cluster components speak with different cluster element layers in the different situations inside the identical cluster database atmosphere. These add-ons are additionally the leading communication links between the Oracle Clusterware towering availability accessories and the Oracle Database. furthermore, these add-ons computer screen and control database operations.
here record describes the services of probably the most main Oracle Clusterware add-ons. This checklist includes these accessories which might be strategies on Unix and Linux operating methods or services on windows.
notice:On home windows-based operating techniques, most of the add-ons are threads of the Oracle process instead of separate techniques.
Cluster Synchronization functions (CSS)—Manages the cluster configuration through controlling which nodes are individuals of the cluster and via notifying contributors when a node joins or leaves the cluster. if you're the employ of third-birthday celebration clusterware, then the css fashion interfaces with your clusterware to control node membership information.
Cluster equipped functions (CRS)—The basic software for managing towering availability operations inside a cluster. anything that the crs technique manages is known as a cluster resource which generally is a database, an example, a provider, a Listener, a digital IP (VIP) handle, an utility system, and so forth. The crs process manages cluster resources in response to the resource's configuration tips that's saved in the OCR. This includes start, stop, computer screen and failover operations. The crs procedure generates events when a useful resource fame adjustments. if in case you tolerate installed Oracle RAC, crs screens the Oracle example, Listener, and so forth, and immediately restarts these add-ons when a failure occurs. by default, the crs process makes five makes an attempt to restart a useful resource and then does not design additional restart attempts if the resource doesn't restart.
event management (EVM)—A historical past manner that publishes activities that crs creates.
Oracle Notification provider (ONS)—A post and subscribe provider for communicating quickly software Notification (FAN) activities.
RACG—Extends clusterware to usher Oracle-specific requirements and complex resources. Runs server callout scripts when FAN routine turn up.
technique video panoply Daemon (OPROCD)—This manner is locked in reminiscence to computer screen the cluster and provide I/O fencing. OPROCD performs its examine, stops working, and if the awaken is past the anticipated time, then OPROCD resets the processor and reboots the node. An OPROCD failure effects in Oracle Clusterware restarting the node. OPROCD uses the hangcheck timer on Linux systems.
In the following table, if a process has a (r) beside it, then the procedure runs as the root person. in any other case the process runs as the oracle person.
table 1-1 listing of strategies and home windows functions associated with Oracle ClusterwareOracle Clusterware part Linux/Unix system home windows facilitiesWindows processes
process video panoply Daemon
Oracle Notification provider (ONS)
evmd (r), evmd.bin, evmlogger
Cluster Synchronization features
init.cssd (r), ocssd (r), ocssd.bin
ocssd.exeThe Oracle Clusterware utility add-ons
When Oracle Clusterware operates, a few platform-selected processes or capabilities will even be running on every node within the cluster to assist Oracle Clusterware. The Oracle Clusterware platform-certain UNIX-primarily based approaches and windows-primarily based services are described below the following headings:Oracle Clusterware methods on UNIX-primarily based programs
The Oracle Clusterware techniques on UNIX-based techniques are:
crsd—Performs unreasonable availability recovery and administration operations akin to conserving the OCR and managing utility resources. This fashion runs as the root consumer, or by using a user within the admin group on Mac OS X-based mostly systems. This manner restarts automatically upon failure.
evmd—experience manager daemon. This system moreover begins the racgevt system to manage FAN server callouts.
ocssd—Manages cluster node membership and runs as the oracle consumer; failure of this procedure effects in cluster restart.
oprocd—process monitor for the cluster. notice that this process most efficient seems on systems that Do not employ seller clusterware with Oracle Clusterware.
observe:Oracle RAC on Linux structures can tolerate assorted threads that look as separate tactics with separate system identifiers. Oracle Clusterware services on home windows-based programs
The Oracle Clusterware features on windows-based mostly programs are:
OracleCRService—Performs unreasonable availability restoration and management operations equivalent to conserving the OCR and managing application components. This technique runs as the root consumer, or by a user within the admin group on Mac OS X-primarily based techniques. This fashion restarts instantly upon failure.
OracleCSService—Manages cluster node membership and runs as oracle consumer; failure of this technique results in cluster restart.
OracleEVMService—adventure manager daemon. This process additionally starts the racgevt process to manage FAN server callouts.
OraFenceService—method computer screen for the cluster. note that this technique most efficient looks on platforms that Do not employ vendor clusterware with Oracle Clusterware.
An Oracle RAC database is a logically or physically shared every Little thing database. bar no one at all datafiles, manage info, PFILEs, and redo log information in Oracle RAC environments tolerate to reside on cluster-mindful shared disks in order that bar no one at all the cluster database circumstances can access them. bar no one at all of the instances must moreover share the equal interconnect. furthermore, Oracle RAC databases can share the identical interconnect that Oracle Clusterware makes employ of.
because an Oracle RAC database makes employ of a shared everything architecture, Oracle RAC requires cluster-mindful storage for bar no one at all database information. it's your option as to how to configure your disk, however you tolerate to employ a supported cluster-aware storage answer. Oracle Database 10g provides automatic Storage management (ASM), which is the informed solution to control your disk. besides the fact that children you may additionally additionally employ a cluster-aware extent manager or a cluster file system (now not required). In Oracle RAC, the Oracle Database utility manages disk access and the Oracle application is certified to be used on lots of storage architectures. An Oracle RAC database can tolerate up to 100 cases. reckoning on your platform, you can employ right here file storage alternate options for Oracle RAC:
ASM, which Oracle recommends
Oracle Cluster File device (OCFS), which is available for Linux and windows platforms, or a third-celebration cluster file system it's certified for Oracle RAC
A network file device
Oracle RAC databases vary architecturally from Oracle RACsingle-example Oracle databases in that every Oracle RAC database instance additionally has:
All nodes in an Oracle RAC ambiance ought to hook up with a local belt network (LAN) to permit users and purposes to access the database. applications should still employ the Oracle Database capabilities function to connect with an Oracle database. features allow you to profile guidelines and features to handle how users and applications hook up with database circumstances. These qualities comprise a different name, workload balancing and failover alternate options, and unreasonable availability characteristics. Oracle net capabilities permits the weight balancing of software connections across bar no one at all the instances in an Oracle RAC database.
clients can entry an Oracle RAC database using a shopper-server configuration or via one or greater focus tiers, with or without connection pooling. users will moreover be DBAs, builders, application clients, vigour users, such as statistics miners who create their personal searches, and the like.
Most public networks customarily employ TCP/IP, but which you could employ any supported hardware and utility aggregate. Oracle RAC database situations may moreover be accessed via a database's defined, default IP tackle and through VIP addresses.
note:don't to design employ of the interconnect or the deepest community for consumer communique because Cache Fusion uses the inner most interconnect for inter-instance communications.
in addition to the node's host name and IP tackle, you exigency to additionally allot a virtual host identify and an IP address to every node. The digital host identify or VIP should be used to connect to the database example. for instance, you may enter the digital host name CRM in the handle checklist of the tnsnames.ora file.
A digital IP address is an alternative public address that client connections employ as an alternative of the usual public IP tackle. To configure VIP addresses, you exigency to reserve a spare IP tackle for every node that makes employ of the same subnet because the public community.
If a node fails, then the node's VIP fails over to an additional node on which the VIP can't settle for connections. frequently, VIPs fail over when the node on which a VIP runs fails or if bar no one at all interfaces for the VIP fail or are disconnected from the network. shoppers that try to connect with the VIP obtain a hastily connection refused error as an alternative of anticipating TCP connect timeout messages. You configure VIP addresses within the tackle record for your database connection definition to permit connectivity. the following belt describes the Oracle RAC software components in more element.The Oracle actual software Clusters utility add-ons
Oracle RAC databases tolerate two or more database circumstances that each and every comprise memory buildings and history approaches. An Oracle RAC database has the identical procedures and memory buildings as a single-instance Oracle database in addition to extra process and reminiscence buildings which are particular to Oracle RAC. any one illustration's database view is well-nigh just dote any other example's view within the equal Oracle RAC database; the view is a single apparatus photo of the atmosphere.
each instance has a buffer cache in its gadget world belt (SGA). using Cache Fusion, Oracle RAC environments logically coalesce every example's buffer cache to permit the cases to process information as if the records resided on a logically combined, single cache.
note:The SGA size requirements for Oracle RAC are improved than the SGA requirements for single-example Oracle databases due to Cache Fusion.
To ensure that each and every Oracle RAC database instance obtains the bury that it must fulfill a query or transaction, Oracle RAC cases employ two strategies, the world Cache carrier (GCS) and the global Enqueue provider (GES). The GCS and GES withhold statistics of the statuses of each and every records file and every cached bury using a world aid directory (GRD). The GRD contents are disbursed across bar no one at all of the energetic instances, which quite simply raises the measurement of the system world enviornment for an Oracle RAC example.
After one instance caches information, another instance in the equal cluster database can purchase a bury photo from yet another illustration in the identical database faster than by means of studying the bury from disk. hence, Cache Fusion strikes existing blocks between instances rather than re-studying the blocks from disk. When a consistent bury is needed or a changed bury is required on a further example, Cache Fusion transfers the bury lifelike at once between the affected situations. Oracle RAC makes employ of the private interconnect for inter-illustration verbal exchange and bury transfers. The global Enqueue provider panoply screen and the instance Enqueue process manages access to Cache Fusion resources as well as enqueue restoration processing.
These Oracle RAC procedures and the GRD collaborate to enable Cache Fusion. The Oracle RAC methods and their identifiers are as follows:
LMS—global Cache provider process
LMD—world Enqueue provider Daemon
LMON—world Enqueue service video display
LCK0—illustration Enqueue technique
in case you employ network connected Storage (NAS), then you are required to configure a second private network. access to this network is typically managed by the seller's utility. The inner most community makes employ of static IP addresses.
word:many of the Oracle accessories that this fragment describes are in addition to the add-ons that are described for single-illustration Oracle databases in Oracle Database ideas. Oracle Clusterware accessories and towering Availability
when you combine Oracle Clusterware and Oracle RAC, you can obtain spectacular scalability and towering availability. The Oracle Clusterware achieves this the employ of the accessories that this fragment describes beneath here topics:The Oracle Clusterware voting Disk and Oracle Cluster Registry
The Oracle Clusterware requires the following two vital info:
vote casting Disk—Manages cluster membership by the employ of a fitness examine and arbitrates cluster possession among the many situations in case of community disasters. Oracle RAC uses the balloting disk to verify which situations are contributors of a cluster. The vote casting disk should reside on shared disk. for top availability, Oracle recommends that you've got varied balloting disks. The Oracle Clusterware enables dissimilar vote casting disks but you exigency to tolerate an atypical variety of voting disks, comparable to three, five, and so forth. if you define a single voting disk, then design sure you employ exterior mirroring to deliver redundancy.
Oracle Cluster Registry (OCR)—maintains cluster configuration guidance in addition to configuration counsel about any cluster database within the cluster. The OCR moreover manages counsel about methods that Oracle Clusterware controls. The OCR shops configuration suggestions in a collection of key-cost pairs inside a listing tree constitution. The OCR must live on shared disk it truly is attainable via bar no one at all of the nodes in your cluster. The Oracle Clusterware can multiplex the OCR and Oracle recommends that you just employ this feature to design sure cluster towering availability. that you may change a failed OCR on-line, and you may update the OCR via supported APIs equivalent to trade manager, the Server control Utility (SRVCTL), or the Database Configuration second (DBCA).
note:each the vote casting disks and the OCRs should dwell on both cluster file gadget files or on shared raw gadgets that you simply configure before you install Oracle Clusterware and Oracle RAC. Oracle Clusterware towering Availability and the application Programming Interface
Oracle Clusterware offers a towering availability application programming interface (API) so you might employ to allow Oracle Clusterware to control functions or approaches that race a cluster. This enables you to deliver towering availability for your whole functions. The Oracle Clusterware with ASM allows you to create a consolidated pool of storage to support each the only-instance Oracle databases and the Oracle RAC databases that are operating for your cluster.
To preserve unreasonable availability, Oracle Clusterware components can reply to repute adjustments to restart applications and tactics according to described towering availability rules. in addition, that you could employ the Oracle Clusterware towering availability framework by using registering your functions with Oracle Clusterware and configuring the clusterware to beginning, stop, or relocate your utility methods. it is, you could design customized functions particularly attainable through the employ of Oracle Clusterware to create profiles that panoply screen, relocate, and restart your purposes. The Oracle Clusterware responds to FAN activities that are created through an Oracle RAC database. Oracle publicizes FAN events when cluster servers may additionally develop into unreachable and community interfaces are gradual or non-functional.Workload administration with Oracle steady utility Clusters
Workload management allows for you to control the distribution of workloads to deliver superior performance for users and functions. This contains proposing the maximum availability for database connections, hastily failure recuperation, and balancing workloads optimally across the lively configuration. Oracle Database 10g with Oracle RAC comprises many aspects that may enhance workload management equivalent to connection load balancing, speedy connection failover (FCF), the weight balancing advisory, and Runtime Connection Load Balancing. Workload administration provides the finest benefits to Oracle RAC environments. which you could, youngsters, recall information of workload administration through the employ of Oracle capabilities in single-illustration Oracle Databases, exceptionally those that employ information guard or Streams. Workload administration comprises the following components:
high Availability Framework—The Oracle RAC towering availability framework allows for the Oracle Database to withhold add-ons in a operating state constantly. Oracle towering availability implies that Oracle Clusterware displays and restarts censorious add-ons if they cease, except you override the restart processing. The Oracle Clusterware and Oracle RAC additionally give signals to valued clientele when configurations exchange. This enables valued clientele to immediately react to the adjustments, enabling software developers to cover outages and reconfigurations from finish users. The scope of Oracle unreasonable availability spans from the restarting of stopped Oracle methods in an Oracle database instance to failing over the processing of a complete instance to other attainable situations.
Load Balancing Advisory—here is the capability of the database to supply guidance to functions in regards to the existing carrier levels being offered by the database and its cases. functions can recall talents of this suggestions to direct connection requests to the illustration as a way to deliver the application request with the greatest provider exceptional to complete the application's processing. Oracle has built-in its Java Database Connectivity (JDBC) and Oracle information issuer for .web (ODP.net) connection swimming pools to work with the load balancing assistance. applications can employ the built-in connection swimming pools devoid of programmatic changes.
services—Oracle Database 10g introduces an impressive automated workload management facility, called functions, to enable the enterprise grid imaginative and prescient. features are entities so that you can define in Oracle RAC databases. functions enable you to neighborhood database workloads and route the work to the most suitable situations that are assigned to manner the service. moreover, that you could employ capabilities to define the resources that Oracle assigns to technique workloads and to video panoply workload supplies. applications that you simply allot to features transparently purchase the described workload management qualities, including towering availability and cargo balancing guidelines. Many Oracle database facets are built-in with features, reminiscent of useful resource supervisor, which enables you to hamper the substances that a service can employ within an illustration. Some database aspects are additionally built-in with Oracle Streams, superior Queuing, to obtain queue status transparency, and the Oracle Scheduler, to map capabilities to sure job courses.
In Oracle RAC databases, the service performance rules that you simply configure control the amount of work that Oracle allocates to each accessible illustration for that provider. As you extend your database with the aid of including nodes, applications, accessories of purposes, and the like, which you can add more functions.
Connection Load Balancing— Oracle internet features gives connection load balancing for database connections. Connection load balancing happens when the connection is created. Connections for a given carrier are balanced across bar no one at all of the operating instances that present the carrier. design sure to define the way you exigency connections to be balanced within the carrier definition. besides the fact that children, you should nevertheless configure Oracle net services. if you occur to allow the load balancing advisory, the Listener makes employ of the load balancing advisory for connection load balancing.
This section introduces the storage alternatives for Oracle RAC and the setting up approaches for each Oracle Clusterware and Oracle RAC beneath here themes:Oracle Clusterware installing technique Description
The Oracle Clusterware is allotted on the Oracle Database 10g setting up media. The Oracle commonplace Installer (OUI) installs Oracle Clusterware right into a directory structure, which will moreover be known as CRS_home, it truly is crash away different Oracle utility running on the desktop. as a result of Oracle Clusterware works carefully with the working gadget, gadget administrator entry is required for one of the vital installing tasks. additionally, some of the Oracle Clusterware techniques ought to race as the gadget administrator, which is generally the basis consumer on Unix and Linux methods and the system Administrator consumer on home windows methods.
prior to installing Oracle Clusterware, Oracle recommends that you simply race the Cluster Verification Utility (CVU) to be sure that your ambiance meets the Oracle Clusterware installing requirements. The OUI additionally automatically runs CVU on the finish of the clusterware setting up to verify various clusterware add-ons. The CVU simplifies the installation, configuration, and usual administration of the Oracle Clusterware installing fashion by using deciding on complications in cluster environments.
all the way through the Oracle Clusterware installation, you should establish three IP addresses for each node that is going to be fragment of your setting up. One IP address is for the inner most interconnect and the other is for the general public interconnect. The third IP tackle is the digital IP tackle that shoppers will employ to connect to every illustration.
The Oracle Clusterware setting up system creates the vote casting disk and OCR on cluster-aware storage. if you select the choice for common redundant copies bar no one at all the way through the setting up process, then Oracle Clusterware instantly keeps redundant copies of these files to stay away from the data from becoming single points of failure. The general redundancy characteristic moreover eliminates the exigency for third party storage redundancy options. should you employ common redundancy, Oracle Clusterware automatically maintains two copies of the Oracle Cluster Registry (OCR) file and three copies of the voting Disk file.
notice:if you select exterior redundancy for the OCR and voting disk, then to enable redundancy, your disk subsystem should be configurable for RAID mirroring. otherwise, your apparatus may well be inclined because the OCR and voting disk are single aspects of failure. Oracle precise application Clusters setting up and Database advent manner Description
The Oracle RAC software is allotted as fragment of the Oracle Database 10g setting up media. by means of default, the ordinary Oracle Database 10g application installation manner installs the Oracle RAC alternative when it acknowledges that you're performing the installing on a cluster. The OUI installs Oracle RAC into a listing structure, which can be referred to as Oracle_home, that is crash free different Oracle utility running on the laptop. as a result of OUI is cluster-conscious, it installs the Oracle RAC utility on bar no one at all the nodes that you simply described to be a fragment of the cluster. if you're the usage of an authorized cluster file gadget for the Oracle domestic, then best select the node that you're connected to for the installation.
You exigency to first deploy Oracle Clusterware before installing Oracle RAC. After Oracle Clusterware is operational, which you could employ OUI to deploy the Oracle database utility with the Oracle RAC accessories. bar no one at all over the setting up, OUI runs DBCA to create your Oracle RAC database in line with the alternatives that you just opt for. The DBCA moreover runs the net Configuration second (NETCA) to configure the network on your Oracle RAC atmosphere.
Oracle recommends that you just select ASM during the setting up to simplify storage management; ASM immediately manages the storage of bar no one at all database information inside disk agencies. that you could additionally configure services bar no one at all the way through installing, depending on your processing requirements. if you're the usage of the Oracle Database 10g usual edition, then you definately must employ ASM for storing bar no one at all the database files.
by using default, DBCA creates one provider to your atmosphere and this provider is for the database. The default carrier is available on bar no one at all situations in an Oracle RAC atmosphere, unless the database is in limited mode.Cloning Oracle Clusterware and Oracle RAC software in Grid Environments
This belt in short summarizes the methods for deploying Oracle RAC in grid environments which tolerate giant numbers of nodes the employ of cloned photographs for Oracle Clusterware and Oracle RAC. Oracle cloning is the favorite fashion of extending your Oracle RAC atmosphere by using adding nodes and cases. To execute the cloning methods which are summarized during this area, quest counsel from the Oracle accepted Installer and OPatch user's e-book.that you could moreover employ commercial enterprise manager Grid handle to operate cloning.
The cloning technique assumes that you simply correctly installed an Oracle Clusterware domestic and an Oracle domestic with Oracle RAC on as a minimum one node. furthermore, bar no one at all root scripts should tolerate race efficaciously on the node from which you are extending your cluster database. to employ Oracle cloning, first clone the Oracle Clusterware home and then clone the Oracle home with the Oracle RAC application.
To clone the Oracle Clusterware domestic, on UNIX-primarily based systems create a tar file of the Oracle Clusterware home and replica the file to the fresh node's Oracle Clusterware home. On windows-primarily based methods you ought to create zip data. Then on UNIX-based mostly programs create the necessary users and companies on the brand fresh nodes. On home windows-based techniques, you Do not should create users and organizations, however the user that performs the cloning should still be the identical person that performed the setting up.
Extract the tar file, or unzip the zip file, and race the Oracle regularly occurring Installer (OUI) in clone mode as described within the Oracle common Installer and OPatch consumer's ebook. Then race the installing scripts and iterate these steps on every node that you're including. The manner for cloning the Oracle home onto fresh nodes is corresponding to the process for cloning the Oracle Clusterware domestic. moreover, you ought to race the Oracle internet Configuration second (NETCA) on each and every fresh node to create a Listener.
in case you tolerate not already created a database, then you could race the Database Configuration second (DBCA) to create one. finally, celebrate the consequence up-cloning tactics to complete the extension of your Oracle RAC atmosphere onto the brand fresh nodes.further issues and lines for Oracle actual application Clusters
apart from configuring functions to manipulate your workloads, additionally trust the employ of right here points should you set up Oracle RAC:
Scaling Your Oracle RAC Database—As outlined, you can add nodes and cases to your Oracle RAC environment using Oracle cloning. in case you resolve to no longer employ cloning, then which you can lengthen your database through the employ of the manual techniques that are described in Chapter 10, "adding and Deleting Nodes and circumstances on UNIX-based mostly techniques" or Chapter 11, " adding and Deleting Nodes and situations on windows-primarily based methods".
enterprise manager—Use trade manager to manage your complete Oracle RAC atmosphere, no longer simply the Oracle RAC database. employ enterprise manager to create and alter services, and to delivery and forestall the cluster database instances and the cluster database. commercial enterprise manager has extra aspects as detailed in the section "Overview of the usage of commercial enterprise supervisor with Oracle precise utility Clusters".
restoration supervisor (RMAN)—RMAN backs up, restores, and recovers datafiles, control info, server parameter information (SPFILEs) and archived redo logs. you could employ RMAN with a media supervisor to returned up info to external storage. that you would be able to additionally configure parallelism when backing up or convalescing Oracle RAC databases. In Oracle RAC, RMAN channels can moreover be dynamically allocated across bar no one at all the Oracle RAC cases. Channel failover makes it possible for failed operations on one node to continue on a different node. you can employ RMAN in Oracle RAC from the Oracle commercial enterprise manager Backup supervisor or from a command line.
automated undo management—immediately manages undo processing.
computerized aspect house administration (ASSM)—instantly manages aspect freelists and freelist groups.
in the neighborhood managed tablespaces—Enhances house administration efficiency.
Cluster Verification Utility (CVU)—Use CVU to verify the status of your clusterware in case you event issues or employ it on every occasion you reconfigure your cluster.
Sequences—in case you employ sequence numbers, then at bar no one at all times employ CACHE with the NOORDER alternative for most desirable sequence number technology performance. With the CACHE alternative, youngsters, you may tolerate gaps in the sequence numbers. in case your ambiance cannot tolerate sequence quantity gaps, then employ the NOCACHE option or accept as steady with pre-generating the sequence numbers. in case your application requires sequence quantity ordering however can tolerate gaps, then employ CACHE and ORDER to cache and order sequence numbers in Oracle RAC. if your application requires ordered sequence numbers devoid of gaps, then employ NOCACHE and ORDER. This combination has probably the most tainted consequence on efficiency in comparison to different caching and ordering mixtures.
Indexes—if you employ indexes, believe options, reminiscent of transpose key indexes, to optimize index performance. transpose key indexes are primarily helpful when you tolerate conventional inserts to 1 side of an index, equivalent to indexes which are in accordance with insert date.
This fragment describes the following Oracle RAC environment management issues:Designing Oracle actual software Clusters Environments
accept as steady with performing right here steps throughout the design and construction of applications that you're deploying on an Oracle RAC database. trust tuning:
The design and the application
The memory and i/O
The working system
notice:If an utility does not scale on an SMP desktop, then relocating the application to an Oracle RAC database can't enhance performance.
believe using hash partitioning for insert-intensive on-line transaction processing (OLTP) functions. Hash partitioning:
Reduces rivalry on concurrent inserts right into a single database constitution
impacts sequence-based mostly indexes when indexes are in the neighborhood 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 would be able to vastly enhance efficiency on your Oracle RAC database. note that you just cannot employ index latitude scans on an index with hash partitioning.
when you are the employ of sequence numbers, then at bar no one at all times employ the CACHE alternative. if you employ sequence numbers with the CACHE option, then:Administrative apparatus for Oracle steady utility Clusters Environments
Oracle makes it possible for you to administer a cluster database as a single apparatus lifelike through commercial enterprise supervisor, SQL*Plus, or through Oracle RAC command-line interfaces similar to Server control (SRVCTL). which you could moreover employ a few apparatus and utilities to manage your Oracle RAC atmosphere and its accessories as follows:
commercial enterprise manager—business supervisor has each the Database control and Grid control GUI interfaces for managing each single illustration and Oracle RAC environments.
Cluster Verification Utility (CVU)—CVU is a command-line tool that you should employ to verify a number of cluster and Oracle RAC-selected add-ons akin to shared storage gadgets, networking configurations, apparatus requirements, and Oracle Clusterware, as well as working gadget companies and users. which you could employ CVU for pre-installing checks as well as for submit-setting up checks of your cluster atmosphere. CVU is mainly positive during pre-installing and bar no one at all the way through installation of Oracle Clusterware and Oracle RAC components. The OUI runs CVU after Oracle Clusterware and the Oracle installation to check your ambiance.
Server manage (SRVCTL)—SRVCTL is a command-line interface for you to employ to manipulate an Oracle RAC database from a single aspect. that you could employ SRVCTL to dawn and stop the database and circumstances and to delete or stream cases and services. that you would be able to additionally employ SRVCTL to control configuration assistance.
See additionally:Appendix E for greater counsel about SRVCTL
Cluster in a position capabilities handle (CRSCTL)—CRSCTL is a command-line device that you can employ to manage Oracle Clusterware. that you can employ CRSCTL to delivery and stop Oracle Clusterware. CRSCTL has many options similar to enabling on-line debugging,
Oracle Interface Configuration tool (OIFCFG)—OIFCFG is a command-line tool for both single-illustration Oracle databases and Oracle RAC environments that you should employ to designate and de-allocate network interfaces to accessories. that you may additionally employ OIFCFG to direct components to employ selected community interfaces and to retrieve component configuration information.
OCR Configuration tool (OCRCONFIG)—OCRCONFIG is a command-line tool for OCR administration. which you can moreover employ the OCRCHECK and OCRDUMP utilities to troubleshoot configuration problems that affect the OCR.
net-primarily based trade supervisor Database handle and Grid handle enable you to panoply screen an Oracle RAC database. The commercial enterprise supervisor Console is a principal factor of manage for the Oracle ambiance that you just access by means of a graphical user interface (GUI). employ the enterprise manager Console to rouse cluster database management tasks. employ enterprise manager Grid manage to administer dissimilar Oracle RAC databases. moreover note the following aspects about monitoring Oracle RAC environments:
The global 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.
note:as a substitute of the usage of Statspak, Oracle recommends that you just employ the extra sophisticated management and monitoring points of the Oracle Database 10g Diagnostic and Tuning packs which consist of the automated Database Diagnostic computer screen (ADDM).
You don't exigency to function particular tuning for Oracle RAC; Oracle RAC scales without special configuration adjustments. if your application carried out well on a single-example Oracle database, then it will execute smartly in an Oracle RAC ambiance. most of the tuning tasks that you would function on a single-example Oracle database can additionally enrich Oracle RAC database efficiency. here's very steady if your atmosphere required scalability throughout a greater variety of CPUs.
one of the most Oracle RAC efficiency facets are:
Dynamic aid Allocation
Cache Fusion permits A Simplified Tuning Methodology
You Do not exigency to tune any parameters for Cache Fusion
No utility-stage tuning is essential
which you can employ a bottom-up tuning strategy with basically no impact for your latest purposes
more discrete efficiency facts
source: Oracle company
November 15, 2010 08:00 ET
Simplifies Deployment of a totally obtainable, Virtualized Database
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pleasing aggregate of Virtualization and Clustering Speeds Time to Market and permits bigger Availability
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Data Storage EquipmentImproves Database Performance and Enables Deployment of Larger Oracle Database Clusters; Postbank Deploys Solution for Retail Banking Application
ORACLE OPENWORLD, San Francisco, Calif. - November 12, 2007 - Voltaire Ltd. (NASDAQ: VOLT), a leading provider of grid backbone solutions for the data center, today announced that its InfiniBand-based solutions are available for Oracle® true Application Clusters 11g. The combination of Oracle true Application Clusters running on Voltaire's InfiniBand-based switches and software delivers faster application-level performance than clusters using Ethernet. The solution moreover enables greater scalability so customers can deploy larger Oracle Database clusters than ever before.
Postbank, one of the largest retail banks in Germany and a beta customer of the latest release of Oracle true Applications Clusters, has tested their cash withdrawal processing application running on HP Proliant servers interconnected with a Voltaire Grid Switch(TM) 20 Gigabits/second InfiniBand switch. Postbank's application, which relies heavily on the performance of the cluster interconnect, has experienced a 50 percent boost in performance using the combined Oracle-Voltaire solution.(*)
"We are very pleased with the performance and scalability that Voltaire InfiniBand brings to Oracle true Application Clusters in their big Oracle Database environment," said Jens-Christian Pokolm, Analyst IT Services, Postbank. "To deliver the best and most answerable service to their customers, their applications exact hastily access to data and this solution truly delivers. An censorious capability this solution provides is the ability to purge latency and scale their Oracle Database applications."
"We are pleased to work with Voltaire to bring the industry standard OpenFabrics answerable Datagram Sockets (RDS) over InfiniBand solution to the Oracle database environment," said Juan Loaiza, Senior Vice President, Oracle. "We believe that the OpenFabrics trouble is crucial to the success of towering performance networking protocols and applaud Voltaire's support of this effort."
The OpenFabrics Alliance is a not-for-profit organization dedicated to expanding and accelerating the adoption of RDMA (Remote Direct memory Access) technologies for server and storage connectivity. Voltaire has played a major role in the OpenFabrics Alliance which led to the inclusion of InfiniBand software in several operating systems including Linux, Windows and others.
"Aside from providing significantly faster run-time, the combination of Oracle true Application Clusters and Voltaire InfiniBand enables the deployment of database clusters that can race larger data sets for both data warehousing and transactional applications," said Asaf Somekh, Vice President of Strategic Alliances, Voltaire. "This solution fits in nicely with the consolidation programs many data centers are now implementing."
"HP ProLiant servers deliver leading performance and scalability for enterprise data focus customers, and Oracle solutions on InfiniBand deliver the performance gains and improved scalability customers want with their applications," said John Gromala, director of ProLiant product marketing, Industry Standard Servers, HP.
Voltaire solutions for Oracle true Application Clusters are available today by calling 1-800-865-8247.
Voltaire will showcase its solutions for Oracle true Application Clusters in booth 2821 at Oracle OpenWorld in San Francisco, November 11-15, 2007. Voltaire is a member of the Oracle PartnerNetwork.
About the Oracle PartnerNetwork
Oracle PartnerNetwork is a global trade network of more than 19,500 companies who deliver innovative software solutions based on Oracle software. Through access to Oracle's premier products, education, technical services, marketing and sales support, the Oracle PartnerNetwork program provides partners with the resources they exigency to be successful in today's global economy. Oracle partners are able to tender their customers leading-edge solutions backed by Oracle's position as the world's largest enterprise software company. Partners who are able to demonstrate superior product knowledge, technical expertise and a commitment to doing trade with Oracle qualify for the Certified ally levels. oraclepartnernetwork.oracle.com
Voltaire (NASDAQ: VOLT) designs and develops server and storage switching and software solutions that enable high-performance grid computing within the data center. Voltaire refers to its server and storage switching and software solutions as the Voltaire Grid Backbone(TM). Voltaire's products leverage InfiniBand technology and comprise director-class switches, multi-service switches, fixed-port configuration switches, Ethernet and Fibre Channel routers and standards-based driver and management software. Voltaire's solutions tolerate been sold to a wide orbit of finish customers including governmental, research and educational organizations, as well as enterprises in the manufacturing, oil and gas, entertainment, life sciences and monetary services industries.
Founded in 1997, Voltaire Ltd. is headquartered in Herzeliya, Israel, and has its U.S. headquarters in Billerica, Massachusetts. More information about Voltaire is available at www.voltaire.com or by calling 1-800-865-8247.Related Thomas Industry Update
Oracle on Wednesday introduced a two-node Oracle Database 11g and Oracle true Application Clusters (RAC) appliance that offers a lower cost entry point to Oracle Exadata, but it doesn’t comprise many of software features that give Exadata performance boosts.
The 4U Intel-based machine, called the Oracle Database Appliance, includes two servers with built-in shared storage that allows finish users to build a two-node Oracle RAC infrastructure. List price starts at $50,000 for the hardware only, significantly lower than the six-figure starting point of a quarter-rack Exadata. Oracle suggested it would work with databases up to 4 terabytes large. Specs include:
That said, the Oracle Database Appliance doesn’t comprise the Oracle Exadata Storage Server Software features such as hybrid columnar compression and smart scan that the company claims tolerate given Exadata exponential query improvements.
“Oracle definitely needed something dote this,” said Alex Gorbachev, chief technology officer (CTO) of Pythian, an Oracle consulting company that took fragment in the beta program for the fresh appliance. “A lot of customers couldn’t warrant the cost of Exadata but could employ some of the features that an integrated appliance can provide.”
It took Pythian “a brace hours” to set up the appliance, tolerate it running and accepting data on it. Gorbachev added that normally a fresh system setup requires expertise from various IT departments: systems, storage, networking and database, for example. Configuring this fresh appliance doesn’t require that.
The appliance moreover comes with some management software that simplifies its operations and automates patching for example.
“It still requires some feeding and keeping when it comes to tuning, but other than that it’s removing a lot of overhead.”
That doesn’t imply it will purge the exigency for a DBA.
Kerry Osborne, chief information officer (CIO) at Enkitec, another Oracle consultancy that had an early peer at the appliance, said finish users won’t merit the same performance that they would merit out of Oracle Exadata. And they shouldn’t expect it either: The fresh product is a smaller, less-expensive version of Exadata, and as such it’s not going to tolerate as many features. Osborne said it’s moreover not something you can throw in the corner and expect to race on its own.
“Anyone that thinks you can race any type of Oracle database without a knowledgeable human being is asking for trouble,” he said.
Shyam Varan Nath, one of the founders of the Oracle Exadata Special Interest Group within the Independent Oracle Users Group, said that Oracle originally had a eighth-rack Exadata but discontinued it. He considered Oracle’s response to those smaller IT shops that said the quarter-rack Exadata was still too expensive.
“This could be a way to provide a similar box at lower price point without raising eyebrows on those already sold at higher price point as meant for big enterprises,” he said.
Oracle OpenWorld - SAN FRANCISCO, Calif., November 12, 2007 - Cisco® today announced that it has been collaborating with Oracle in the evolution and validation of answerable Datagram Sockets, an acceleration protocol to further scale Oracle® true Application Clusters (RAC) 11g, using InfiniBand. Cisco has moreover worked closely with Oracle in testing and validating designs for integrating Cisco application delivery and storage networking technologies with the Oracle Fusion Middleware and Oracle Applications 11i product families. These collaborative efforts support Data focus 3.0, Cisco's strategy to aid its customers develop next generation data centers that optimize application performance, service levels, efficiency and collaboration.
Oracle true Application Clusters supports the deployment of a single database across a cluster of servers to provide failing tolerance, towering performance, and scalability. Implemented as an OpenFabrics upper-layer protocol, the answerable Datagram Sockets (RDS) protocol improves the scalability of Oracle true Application Clusters 11g deployments using industry-standard servers, increases performance, and provides for modular growth and flexibility, while helping to reduce both capital and operating costs. Combining Cisco InfiniBand server fabric switches with the RDS interconnect protocol helps successfully accelerate and scale Oracle true Application Clusters 11g to 16 industry-standard servers and beyond. This solution moreover minimizes risk for Oracle customers by providing technologies that are optimized to work together. RDS is packaged with the industry standard OpenFabrics Enterprise Distribution (OFED) Linux drivers for InfiniBand.
"For more than 20 years, Oracle and Cisco tolerate been helping global enterprise customers automate trade processes and deploy Internet-based networks," said Judson Althoff, vice president, Worldwide Platform and Distribution Alliances at Oracle. "As one of their Global Platform Partners, Cisco brings valuable networking expertise to their collaborative efforts in several strategic technology areas and joint solutions to support their customers' current needs and future requirements."Cisco Data focus Solutions for Oracle Deployments
As enterprise application users exact higher performance and productivity, Cisco and Oracle tolerate collaborated to meet these demands in several specific data focus technology areas. Cisco Wide belt Application Services (WAAS) products for WAN optimization, the Cisco Application Control Engine (ACE) for application load-balancing, and the Cisco MDS 9000 series of storage networking products tolerate bar no one at all been recently tested and validated for deployment across multiple Oracle product families. For example, Cisco ACE and WAAS products working together tolerate been documented to multiply performance for Oracle Fusion Middleware and Oracle Applications 11i when accessed by remote users across a wide belt network. Additionally, Cisco ACE products tolerate enabled more scalability and availability for Oracle applications, while reducing server and network resource requirements. Design guides for these joint solutions tolerate been developed to support easier deployment and minimize risk. For more information tickle visit www.cisco.com/go/oracle.Oracle and Cisco WebEx
In addition, Oracle and Cisco WebEx recently announced that they will tender Oracle's Siebel CRM On exact Service, an award-winning customer relationship management (CRM) application service, through the WebEx Connect application ecosystem. Cisco WebEx's on-demand collaboration expertise, combined with Oracle's enterprise-class Siebel CRM On exact Service, creates a collaborative customer experience designed to accelerate sales cycles at businesses of any size. A WebEx Connect user can quickly build a sales mashup with WebEx Sales Center, Siebel CRM On Demand, a social networking site, and an e-mail and calendaring client. These trade mashups ameliorate productivity by integrating with WebEx Connect's unified collaboration and communications capabilities to provide contextual collaboration within a trade process.Cisco at Oracle OpenWorld
Attendees at Oracle OpenWorld are invited to attend two Cisco presentations to learn how Cisco data focus solutions for Oracle Applications optimize network performance to enhance application availability and security, while helping to reduce costs. The presentations are "Oracle true Application Clusters (RAC) 11g with Cisco Server Fabric Switches Using InfiniBand Technology" on Tuesday, Nov. 13, 12:15pm-1:15pm, at Moscone West 3024 L3, and "Data focus Network Architecture for Available, Fast, Secure, and Manageable Oracle Applications Deployments" on Thursday, Nov. 15, 8:30am-9:30am, at Marriott Golden Gate C2. Cisco is moreover participating on panel sessions throughout the conference. Attendees are moreover invited to attend the Cisco TelePresence kiosk at the Inside Innovation Interaction Zone and the WebEx kiosk at the CRM On exact Pavilion.Data focus 3.0
The Cisco vision for Data focus 3.0 entails the real-time, dynamic orchestration of infrastructure services from shared pools of virtualized server, storage and network resources, while optimizing application service levels, efficiency and collaboration. Cisco and its partners are helping organizations to design and build virtualized, self-defending and efficient data focus infrastructure for delivering superior application performance and user experience.
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GuidanceSoftware [2 Certification Exam(s) ]
H3C [1 Certification Exam(s) ]
HDI [9 Certification Exam(s) ]
Healthcare [3 Certification Exam(s) ]
HIPAA [2 Certification Exam(s) ]
Hitachi [30 Certification Exam(s) ]
Hortonworks [4 Certification Exam(s) ]
Hospitality [2 Certification Exam(s) ]
HP [750 Certification Exam(s) ]
HR [4 Certification Exam(s) ]
HRCI [1 Certification Exam(s) ]
Huawei [21 Certification Exam(s) ]
Hyperion [10 Certification Exam(s) ]
IAAP [1 Certification Exam(s) ]
IAHCSMM [1 Certification Exam(s) ]
IBM [1532 Certification Exam(s) ]
IBQH [1 Certification Exam(s) ]
ICAI [1 Certification Exam(s) ]
ICDL [6 Certification Exam(s) ]
IEEE [1 Certification Exam(s) ]
IELTS [1 Certification Exam(s) ]
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IIA [3 Certification Exam(s) ]
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IISFA [1 Certification Exam(s) ]
Intel [2 Certification Exam(s) ]
IQN [1 Certification Exam(s) ]
IRS [1 Certification Exam(s) ]
ISA [1 Certification Exam(s) ]
ISACA [4 Certification Exam(s) ]
ISC2 [6 Certification Exam(s) ]
ISEB [24 Certification Exam(s) ]
Isilon [4 Certification Exam(s) ]
ISM [6 Certification Exam(s) ]
iSQI [7 Certification Exam(s) ]
ITEC [1 Certification Exam(s) ]
Juniper [64 Certification Exam(s) ]
LEED [1 Certification Exam(s) ]
Legato [5 Certification Exam(s) ]
Liferay [1 Certification Exam(s) ]
Logical-Operations [1 Certification Exam(s) ]
Lotus [66 Certification Exam(s) ]
LPI [24 Certification Exam(s) ]
LSI [3 Certification Exam(s) ]
Magento [3 Certification Exam(s) ]
Maintenance [2 Certification Exam(s) ]
McAfee [8 Certification Exam(s) ]
McData [3 Certification Exam(s) ]
Medical [69 Certification Exam(s) ]
Microsoft [374 Certification Exam(s) ]
Mile2 [3 Certification Exam(s) ]
Military [1 Certification Exam(s) ]
Misc [1 Certification Exam(s) ]
Motorola [7 Certification Exam(s) ]
mySQL [4 Certification Exam(s) ]
NBSTSA [1 Certification Exam(s) ]
NCEES [2 Certification Exam(s) ]
NCIDQ [1 Certification Exam(s) ]
NCLEX [2 Certification Exam(s) ]
Network-General [12 Certification Exam(s) ]
NetworkAppliance [39 Certification Exam(s) ]
NI [1 Certification Exam(s) ]
NIELIT [1 Certification Exam(s) ]
Nokia [6 Certification Exam(s) ]
Nortel [130 Certification Exam(s) ]
Novell [37 Certification Exam(s) ]
OMG [10 Certification Exam(s) ]
Oracle [279 Certification Exam(s) ]
P&C [2 Certification Exam(s) ]
Palo-Alto [4 Certification Exam(s) ]
PARCC [1 Certification Exam(s) ]
PayPal [1 Certification Exam(s) ]
Pegasystems [12 Certification Exam(s) ]
PEOPLECERT [4 Certification Exam(s) ]
PMI [15 Certification Exam(s) ]
Polycom [2 Certification Exam(s) ]
PostgreSQL-CE [1 Certification Exam(s) ]
Prince2 [6 Certification Exam(s) ]
PRMIA [1 Certification Exam(s) ]
PsychCorp [1 Certification Exam(s) ]
PTCB [2 Certification Exam(s) ]
QAI [1 Certification Exam(s) ]
QlikView [1 Certification Exam(s) ]
Quality-Assurance [7 Certification Exam(s) ]
RACC [1 Certification Exam(s) ]
Real-Estate [1 Certification Exam(s) ]
RedHat [8 Certification Exam(s) ]
RES [5 Certification Exam(s) ]
Riverbed [8 Certification Exam(s) ]
RSA [15 Certification Exam(s) ]
Sair [8 Certification Exam(s) ]
Salesforce [5 Certification Exam(s) ]
SANS [1 Certification Exam(s) ]
SAP [98 Certification Exam(s) ]
SASInstitute [15 Certification Exam(s) ]
SAT [1 Certification Exam(s) ]
SCO [10 Certification Exam(s) ]
SCP [6 Certification Exam(s) ]
SDI [3 Certification Exam(s) ]
See-Beyond [1 Certification Exam(s) ]
Siemens [1 Certification Exam(s) ]
Snia [7 Certification Exam(s) ]
SOA [15 Certification Exam(s) ]
Social-Work-Board [4 Certification Exam(s) ]
SpringSource [1 Certification Exam(s) ]
SUN [63 Certification Exam(s) ]
SUSE [1 Certification Exam(s) ]
Sybase [17 Certification Exam(s) ]
Symantec [134 Certification Exam(s) ]
Teacher-Certification [4 Certification Exam(s) ]
The-Open-Group [8 Certification Exam(s) ]
TIA [3 Certification Exam(s) ]
Tibco [18 Certification Exam(s) ]
Trainers [3 Certification Exam(s) ]
Trend [1 Certification Exam(s) ]
TruSecure [1 Certification Exam(s) ]
USMLE [1 Certification Exam(s) ]
VCE [6 Certification Exam(s) ]
Veeam [2 Certification Exam(s) ]
Veritas [33 Certification Exam(s) ]
Vmware [58 Certification Exam(s) ]
Wonderlic [2 Certification Exam(s) ]
Worldatwork [2 Certification Exam(s) ]
XML-Master [3 Certification Exam(s) ]
Zend [6 Certification Exam(s) ]
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