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This chapter introduces Oracle Clusterware and Oracle real application Clusters (Oracle RAC) via describing these products in addition to a way to install, administer, and install them. This chapter describes Oracle Clusterware and Oracle RAC architectures as neatly because the application and hardware add-ons for each of those products. This chapter also in brief describes workload administration, features, and high availability for both single-illustration Oracle databases and Oracle RAC environments. This chapter includes here issues:Oracle Clusterware and Oracle real software Clusters
A cluster comprises assorted interconnected computers or servers that appear as if they are one server to end users and purposes. Oracle Database 10g precise software Clusters (Oracle RAC) permits the clustering of the Oracle Database. Oracle RAC uses Oracle Clusterware for the infrastructure to bind varied servers so that they function as a single equipment.
Oracle Clusterware is a transportable cluster administration answer it is integrated with the Oracle database. The Oracle Clusterware is also a required element for the usage of Oracle RAC. furthermore, Oracle Clusterware allows both single-example Oracle databases and Oracle RAC databases to use the Oracle high availability infrastructure. The Oracle Clusterware permits you to create a clustered pool of storage for use by way of any mixture of single-instance and Oracle RAC databases.
Oracle Clusterware is the handiest clusterware that you need for most platforms on which Oracle RAC operates. which you can also use clusterware from different providers if the clusterware is certified for Oracle RAC.
Single-instance Oracle databases have a one-to-one relationship between the Oracle database and the example. Oracle RAC environments, although, have a one-to-many relationship between the database and cases. In Oracle RAC environments, the cluster database instances access one database. The mixed processing energy of the distinct servers can supply enhanced throughput and scalability than is available from a single server. Oracle RAC is the Oracle Database alternative that offers a single system graphic for assorted servers to entry one Oracle database. In Oracle RAC, every Oracle instance continually runs on a separate server.
Oracle RAC is a special technology that gives excessive availability and scalability for all utility types. The Oracle RAC infrastructure is also a key component for imposing the Oracle enterprise grid computing architecture. Having diverse cases access a single database prevents the server from being a single point of failure. Oracle RAC allows you to mix smaller commodity servers right into a cluster to create scalable environments that assist mission critical company applications. functions that you just set up on Oracle RAC databases can function with out code adjustments.The Oracle Clusterware structure and Oracle Clusterware Processing
The Oracle Clusterware is application that when put in on servers running the equal working device, allows for the servers to be bound together to operate as if they had been one server. The Oracle Clusterware requires two clusterware add-ons: a vote casting disk to list node membership tips and the Oracle Cluster Registry (OCR) to list cluster configuration assistance. The balloting disk and the OCR need to live on shared storage. The Oracle Clusterware requires that each node be linked to a non-public community by the use of a private interconnect.
The private interconnect that Oracle Clusterware requires is a separate network that you just configure between the cluster nodes. This interconnect, which is required by means of Oracle RAC, will also be the same network that the clusterware makes use of, but the interconnect should still no longer be available by nodes that don't seem to be a part of the cluster.
Oracle recommends that you configure a redundant interconnect to prevent the interconnect from being a single aspect of failure. Oracle additionally recommends that you simply use user Datagram Protocol (UDP) on a Gigabit Ethernet in your cluster interconnect. Crossover cables don't seem to be supported for use with Oracle Clusterware or Oracle RAC databases.
The Oracle Clusterware manages node membership and prevents break up brain syndrome during which two or more circumstances try to manage the database. this may happen in circumstances the place there's a damage in verbal exchange between nodes throughout the interconnect.
The Oracle Clusterware architecture helps excessive availability by way of automatically restarting stopped add-ons. The Oracle Clusterware can automatically re-beginning a node to stay away from problems with that node from affecting the provision of the rest of the Oracle RAC ambiance. In an Oracle RAC ambiance, all Oracle tactics are below the control of the Oracle clusterware. The Oracle Clusterware additionally offers an software programming interface (API) that allows you to manage different Oracle tactics with Oracle Clusterware.Oracle Clusterware software part Processing particulars
The Oracle Clusterware comprises a couple of historical past tactics that facilitate cluster operations. The Cluster Synchronization provider (CSS), adventure management (EVM), and Oracle Cluster accessories communicate with different cluster part layers within the different situations within the identical cluster database ambiance. These accessories are additionally the leading communication links between the Oracle Clusterware excessive availability add-ons and the Oracle Database. furthermore, these add-ons video display and manage database operations.
here list describes the services of one of the crucial essential Oracle Clusterware accessories. This listing comprises these components which can be methods on Unix and Linux working techniques or functions on windows.
notice:On windows-primarily based working methods, many of the components are threads of the Oracle manner as an alternative of separate methods.
Cluster Synchronization services (CSS)—Manages the cluster configuration via controlling which nodes are contributors of the cluster and by way of notifying members when a node joins or leaves the cluster. when you are using third-party clusterware, then the css method interfaces with your clusterware to control node membership suggestions.
Cluster ready capabilities (CRS)—The simple application for managing excessive availability operations within a cluster. anything that the crs process manages is referred to as a cluster useful resource which generally is a database, an example, a service, a Listener, a digital IP (VIP) address, an software procedure, and so forth. The crs method manages cluster components in line with the aid's configuration guidance that is stored in the OCR. This contains delivery, cease, video display and failover operations. The crs process generates movements when a resource status changes. when you have put in Oracle RAC, crs displays the Oracle example, Listener, and so forth, and automatically restarts these components when a failure occurs. by using default, the crs process makes 5 makes an attempt to restart a aid after which doesn't make further restart attempts if the useful resource doesn't restart.
experience management (EVM)—A heritage manner that publishes hobbies that crs creates.
Oracle Notification service (ONS)—A post and subscribe service for communicating quickly utility Notification (FAN) hobbies.
RACG—Extends clusterware to aid Oracle-particular requirements and sophisticated substances. Runs server callout scripts when FAN pursuits ensue.
system display screen Daemon (OPROCD)—This method is locked in memory to monitor the cluster and provide I/O fencing. OPROCD performs its verify, stops working, and if the awaken is beyond the anticipated time, then OPROCD resets the processor and reboots the node. An OPROCD failure effects in Oracle Clusterware restarting the node. OPROCD makes use of the hangcheck timer on Linux systems.
In here desk, if a system has a (r) beside it, then the technique runs as the root person. otherwise the process runs as the oracle consumer.
table 1-1 list of tactics and home windows functions associated with Oracle ClusterwareOracle Clusterware component Linux/Unix process windows amenitiesWindows processes
process display screen Daemon
Oracle Notification provider (ONS)
evmd (r), evmd.bin, evmlogger
Cluster Synchronization services
init.cssd (r), ocssd (r), ocssd.bin
ocssd.exeThe Oracle Clusterware software components
When Oracle Clusterware operates, several platform-selected processes or services will also be operating on every node within the cluster to aid Oracle Clusterware. The Oracle Clusterware platform-particular UNIX-primarily based tactics and home windows-primarily based functions are described below here headings:Oracle Clusterware techniques on UNIX-based mostly programs
The Oracle Clusterware strategies on UNIX-based mostly systems are:
crsd—Performs high availability recovery and management operations corresponding to protecting the OCR and managing application resources. This system runs because the root user, or by way of a person within the admin community on Mac OS X-based programs. This technique restarts instantly upon failure.
evmd—event supervisor daemon. This manner also starts the racgevt technique to manipulate FAN server callouts.
ocssd—Manages cluster node membership and runs as the oracle person; failure of this manner results in cluster restart.
oprocd—system video display for the cluster. word that this manner handiest appears on platforms that don't use supplier clusterware with Oracle Clusterware.
notice:Oracle RAC on Linux platforms can have multiple threads that appear as separate methods with separate procedure identifiers. Oracle Clusterware functions on home windows-based techniques
The Oracle Clusterware services on home windows-based mostly programs are:
OracleCRService—Performs excessive availability recuperation and administration operations reminiscent of retaining the OCR and managing software supplies. This method runs because the root consumer, or by means of a consumer in the admin community on Mac OS X-based methods. This method restarts instantly upon failure.
OracleCSService—Manages cluster node membership and runs as oracle consumer; failure of this method results in cluster restart.
OracleEVMService—experience manager daemon. This manner also starts the racgevt process to control FAN server callouts.
OraFenceService—procedure display screen for the cluster. word that this method only appears on platforms that don't use supplier clusterware with Oracle Clusterware.
An Oracle RAC database is a logically or bodily shared everything database. All datafiles, control data, PFILEs, and redo log information in Oracle RAC environments must reside on cluster-mindful shared disks so that all the cluster database circumstances can access them. all of the circumstances need to also share the equal interconnect. in addition, Oracle RAC databases can share the identical interconnect that Oracle Clusterware uses.
as a result of an Oracle RAC database makes use of a shared every thing structure, Oracle RAC requires cluster-conscious storage for all database files. it's your option as to a way to configure your disk, however you must use a supported cluster-aware storage answer. Oracle Database 10g gives computerized Storage management (ASM), which is the counseled answer to manage your disk. although you may also use a cluster-aware volume manager or a cluster file system (not required). In Oracle RAC, the Oracle Database utility manages disk access and the Oracle software is licensed to be used on plenty of storage architectures. An Oracle RAC database can have as much as 100 circumstances. depending on your platform, you can use here file storage options for Oracle RAC:
ASM, which Oracle recommends
Oracle Cluster File system (OCFS), which is purchasable for Linux and home windows structures, or a third-celebration cluster file device it truly is licensed for Oracle RAC
A community file device
Oracle RAC databases fluctuate architecturally from Oracle RACsingle-illustration Oracle databases in that each and every Oracle RAC database illustration also has:
All nodes in an Oracle RAC environment ought to hook up with a native area network (LAN) to enable users and purposes to entry the database. functions should still use the Oracle Database functions feature to connect to an Oracle database. functions permit you to outline suggestions and qualities to handle how users and applications hook up with database cases. These features consist of a special identify, workload balancing and failover alternatives, and excessive availability characteristics. Oracle internet features allows for the burden balancing of utility connections throughout all the cases in an Oracle RAC database.
clients can access an Oracle RAC database the use of a shopper-server configuration or through one or extra center tiers, with or with out connection pooling. users can also be DBAs, builders, software users, vigour users, corresponding to data miners who create their own searches, and so forth.
Most public networks usually use TCP/IP, however that you can use any supported hardware and software aggregate. Oracle RAC database cases can be accessed through a database's defined, default IP address and through VIP addresses.
be aware:do not to use the interconnect or the private network for consumer verbal exchange as a result of Cache Fusion makes use of the deepest interconnect for inter-example communications.
in addition to the node's host name and IP handle, you need to also assign a virtual host name and an IP address to each and every node. The virtual host name or VIP should be used to hook up with the database illustration. as an example, you could enter the digital host identify CRM in the address list of the tnsnames.ora file.
A virtual IP handle is an alternative public address that customer connections use in its place of the common public IP handle. To configure VIP addresses, you need to reserve a spare IP address for each and every node that makes use of the identical subnet as the public network.
If a node fails, then the node's VIP fails over to yet another node on which the VIP can not settle for connections. frequently, VIPs fail over when the node on which a VIP runs fails or if all interfaces for the VIP fail or are disconnected from the community. customers that try to connect to the VIP obtain a quick connection refused error as a substitute of waiting for TCP connect timeout messages. You configure VIP addresses within the tackle record to your database connection definition to permit connectivity. right here area describes the Oracle RAC utility add-ons in additional aspect.The Oracle real software Clusters utility add-ons
Oracle RAC databases have two or extra database instances that every contain reminiscence constructions and history approaches. An Oracle RAC database has the identical techniques and reminiscence buildings as a single-example Oracle database as well as further procedure and reminiscence buildings that are particular to Oracle RAC. anybody instance's database view is well-nigh identical to some other example's view in the same Oracle RAC database; the view is a single device image of the environment.
each example has a buffer cache in its device world area (SGA). the use of Cache Fusion, Oracle RAC environments logically combine each and every illustration's buffer cache to enable the situations to manner facts as if the information resided on a logically mixed, single cache.
notice:The SGA dimension necessities for Oracle RAC are superior than the SGA necessities for single-instance Oracle databases due to Cache Fusion.
To make certain that each Oracle RAC database illustration obtains the block that it needs to fulfill a question or transaction, Oracle RAC circumstances use two techniques, the global Cache provider (GCS) and the world Enqueue provider (GES). The GCS and GES maintain data of the statuses of each information file and each cached block using a worldwide resource listing (GRD). The GRD contents are disbursed across all of the lively instances, which without difficulty increases the dimension of the device world area for an Oracle RAC example.
After one example caches statistics, some other instance in the equal cluster database can acquire a block photo from an additional example in the identical database quicker than by way of studying the block from disk. for this reason, Cache Fusion moves present blocks between circumstances in preference to re-analyzing the blocks from disk. When a consistent block is required or a changed block is required on another illustration, Cache Fusion transfers the block photograph at once between the affected situations. Oracle RAC uses the deepest interconnect for inter-illustration communication and block transfers. The world Enqueue service monitor and the example Enqueue process manages entry to Cache Fusion elements in addition to enqueue recuperation processing.
These Oracle RAC strategies and the GRD collaborate to permit Cache Fusion. The Oracle RAC tactics and their identifiers are as follows:
LMS—global Cache carrier process
LMD—world Enqueue provider Daemon
LMON—global Enqueue provider video display
LCK0—instance Enqueue system
in case you use community connected Storage (NAS), then you are required to configure a second inner most community. entry to this community is usually managed with the aid of the supplier's utility. The private community uses static IP addresses.
note:lots of the Oracle components that this section describes are besides the accessories that are described for single-illustration Oracle databases in Oracle Database ideas. Oracle Clusterware components and high Availability
in case you combine Oracle Clusterware and Oracle RAC, you can obtain superb scalability and excessive availability. The Oracle Clusterware achieves this the use of the add-ons that this area describes beneath the following subject matters:The Oracle Clusterware balloting Disk and Oracle Cluster Registry
The Oracle Clusterware requires here two essential files:
balloting Disk—Manages cluster membership by way of a health investigate and arbitrates cluster ownership among the instances in case of community screw ups. Oracle RAC uses the voting disk to verify which instances are members of a cluster. The vote casting disk need to stay on shared disk. for high availability, Oracle recommends that you've diverse balloting disks. The Oracle Clusterware allows for dissimilar balloting disks but you ought to have an ordinary number of vote casting disks, reminiscent of three, 5, and so on. in case you outline a single voting disk, then you'll want to use external mirroring to supply redundancy.
Oracle Cluster Registry (OCR)—maintains cluster configuration tips as well as configuration assistance about any cluster database inside the cluster. The OCR additionally manages suggestions about approaches that Oracle Clusterware controls. The OCR stores configuration information in a sequence of key-price pairs within a listing tree constitution. The OCR ought to reside on shared disk it really is accessible via all of the nodes on your cluster. The Oracle Clusterware can multiplex the OCR and Oracle recommends that you simply use this characteristic to be certain cluster high availability. that you would be able to change a failed OCR online, and you can replace the OCR via supported APIs akin to business supervisor, the Server control Utility (SRVCTL), or the Database Configuration Assistant (DBCA).
be aware:both the balloting disks and the OCRs must dwell on either cluster file device info or on shared uncooked devices that you configure prior to installing Oracle Clusterware and Oracle RAC. Oracle Clusterware excessive Availability and the application Programming Interface
Oracle Clusterware gives a high availability software programming interface (API) so that you can use to allow Oracle Clusterware to manipulate functions or tactics that run a cluster. This makes it possible for you to provide high availability for all of your purposes. The Oracle Clusterware with ASM permits you to create a consolidated pool of storage to help each the only-instance Oracle databases and the Oracle RAC databases that are working for your cluster.
To hold excessive availability, Oracle Clusterware accessories can respond to popularity changes to restart applications and techniques based on described excessive availability guidelines. in addition, that you would be able to use the Oracle Clusterware high availability framework by way of registering your purposes with Oracle Clusterware and configuring the clusterware to delivery, cease, or relocate your application tactics. it's, you could make custom functions incredibly available through the use of Oracle Clusterware to create profiles that display screen, relocate, and restart your functions. The Oracle Clusterware responds to FAN pursuits that are created with the aid of an Oracle RAC database. Oracle proclaims FAN activities when cluster servers may additionally develop into unreachable and community interfaces are gradual or non-purposeful.Workload management with Oracle actual software Clusters
Workload administration permits you to manage the distribution of workloads to provide premiere efficiency for users and purposes. This comprises providing the optimum availability for database connections, quick failure healing, and balancing workloads optimally throughout the energetic configuration. Oracle Database 10g with Oracle RAC comprises many facets that may boost workload management corresponding to connection load balancing, speedy connection failover (FCF), the weight balancing advisory, and Runtime Connection Load Balancing. Workload administration gives the most suitable benefits to Oracle RAC environments. that you would be able to, however, take talents of workload administration through the use of Oracle services in single-instance Oracle Databases, exceptionally folks that use data protect or Streams. Workload management comprises right here add-ons:
excessive Availability Framework—The Oracle RAC high availability framework allows the Oracle Database to retain add-ons in a working state at all times. Oracle excessive availability implies that Oracle Clusterware monitors and restarts crucial add-ons if they cease, unless you override the restart processing. The Oracle Clusterware and Oracle RAC additionally supply indicators to customers when configurations trade. This enables valued clientele to automatically react to the adjustments, enabling application developers to disguise outages and reconfigurations from conclusion users. The scope of Oracle excessive availability spans from the restarting of stopped Oracle tactics in an Oracle database illustration to failing over the processing of a whole illustration to different available circumstances.
Load Balancing Advisory—this is the capacity of the database to provide information to purposes in regards to the current provider levels being supplied via the database and its instances. purposes can take potential of this suggestions to direct connection requests to the instance as a way to provide the utility request with the premiere carrier best to finished the utility's processing. Oracle has built-in its Java Database Connectivity (JDBC) and Oracle facts company for .web (ODP.web) connection swimming pools to work with the load balancing tips. purposes can use the built-in connection swimming pools without programmatic changes.
features—Oracle Database 10g introduces a powerful automatic workload management facility, referred to as services, to permit the enterprise grid vision. capabilities are entities that you should define in Oracle RAC databases. functions permit you to community database workloads and route the work to the most beneficial cases which are assigned to manner the carrier. additionally, that you would be able to use functions to outline the supplies that Oracle assigns to manner workloads and to video display workload materials. functions that you simply assign to functions transparently acquire the defined workload administration characteristics, including excessive availability and load balancing suggestions. Many Oracle database features are integrated with services, reminiscent of aid supervisor, which enables you to preclude the supplies that a service can use inside an example. Some database facets are also integrated with Oracle Streams, superior Queuing, to achieve queue vicinity transparency, and the Oracle Scheduler, to map features to certain job classes.
In Oracle RAC databases, the carrier performance suggestions that you simply configure control the volume of work that Oracle allocates to each accessible example for that carrier. As you extend your database through adding nodes, functions, accessories of purposes, and so forth, you could add extra services.
Connection Load Balancing— Oracle web services gives connection load balancing for database connections. Connection load balancing happens when the connection is created. Connections for a given carrier are balanced throughout the entire working circumstances that present the provider. be sure you outline how you want connections to be balanced within the carrier definition. although, you need to nevertheless configure Oracle web capabilities. in the event you enable the weight balancing advisory, the Listener uses the burden balancing advisory for connection load balancing.
This section introduces the storage alternate options for Oracle RAC and the installing processes for each Oracle Clusterware and Oracle RAC under here themes:Oracle Clusterware installation procedure Description
The Oracle Clusterware is allotted on the Oracle Database 10g installing media. The Oracle widespread Installer (OUI) installs Oracle Clusterware into a listing constitution, which can also be called CRS_home, this is become independent from different Oracle software running on the computer. as a result of Oracle Clusterware works closely with the working device, equipment administrator access is required for probably the most installation initiatives. furthermore, one of the vital Oracle Clusterware processes should run as the equipment administrator, which is often the foundation user on Unix and Linux methods and the gadget Administrator person on home windows methods.
before you install Oracle Clusterware, Oracle recommends that you run the Cluster Verification Utility (CVU) to make sure that your atmosphere meets the Oracle Clusterware installation requirements. The OUI additionally automatically runs CVU at the conclusion of the clusterware installing to determine quite a few clusterware accessories. The CVU simplifies the setting up, configuration, and overall administration of the Oracle Clusterware installing manner by using picking complications in cluster environments.
all over the Oracle Clusterware installation, you ought to identify three IP addresses for each node that goes to be a part of your installation. One IP address is for the private interconnect and the other is for the public interconnect. The third IP tackle is the virtual IP handle that purchasers will use to connect to each example.
The Oracle Clusterware installation procedure creates the vote casting disk and OCR on cluster-mindful storage. in case you select the choice for regular redundant copies right through the installing procedure, then Oracle Clusterware automatically maintains redundant copies of those files to avoid the information from becoming single features of failure. The normal redundancy function additionally eliminates the want for third party storage redundancy options. if you use general redundancy, Oracle Clusterware instantly keeps two copies of the Oracle Cluster Registry (OCR) file and three copies of the vote casting Disk file.
observe:in case you select exterior redundancy for the OCR and vote casting disk, then to permit redundancy, your disk subsystem should be configurable for RAID mirroring. otherwise, your device could be inclined because the OCR and voting disk are single points of failure. Oracle real software Clusters installation and Database creation process Description
The Oracle RAC utility is dispensed as part of the Oracle Database 10g installation media. through default, the common Oracle Database 10g utility setting up procedure installs the Oracle RAC alternative when it acknowledges that you are performing the setting up on a cluster. The OUI installs Oracle RAC right into a listing constitution, which can also be known as Oracle_home, it's break free different Oracle utility working on the laptop. as a result of OUI is cluster-mindful, it installs the Oracle RAC software on the entire nodes that you described to be a part of the cluster. if you are the usage of a certified cluster file system for the Oracle home, then most effective select the node that you're related to for the installing.
You should first set up Oracle Clusterware before installing Oracle RAC. After Oracle Clusterware is operational, that you can use OUI to install the Oracle database utility with the Oracle RAC components. right through the installation, OUI runs DBCA to create your Oracle RAC database according to the options that you just select. The DBCA additionally runs the net Configuration Assistant (NETCA) to configure the community in your Oracle RAC ambiance.
Oracle recommends that you simply opt for ASM all over the setting up to simplify storage administration; ASM instantly manages the storage of all database files within disk agencies. you can additionally configure functions right through installation, reckoning on your processing necessities. if you are using the Oracle Database 10g general version, then you definitely must use ASM for storing all of the database information.
via default, DBCA creates one service to your environment and this service is for the database. The default carrier is accessible on all situations in an Oracle RAC atmosphere, unless the database is in constrained mode.Cloning Oracle Clusterware and Oracle RAC utility in Grid Environments
This part in short summarizes the procedures for deploying Oracle RAC in grid environments that have significant numbers of nodes the usage of cloned images for Oracle Clusterware and Oracle RAC. Oracle cloning is the favourite system of extending your Oracle RAC atmosphere by means of adding nodes and circumstances. To operate the cloning processes which are summarized in this part, seek advice from the Oracle time-honored Installer and OPatch consumer's e book.that you would be able to additionally use commercial enterprise manager Grid control to perform cloning.
The cloning process assumes that you effectively put in an Oracle Clusterware domestic and an Oracle domestic with Oracle RAC on at least one node. furthermore, all root scripts should have run effectively on the node from which you are extending your cluster database. to use Oracle cloning, first clone the Oracle Clusterware domestic and then clone the Oracle home with the Oracle RAC software.
To clone the Oracle Clusterware domestic, on UNIX-based techniques create a tar file of the Oracle Clusterware domestic and duplicate the file to the new node's Oracle Clusterware domestic. On windows-based mostly methods you must create zip files. Then on UNIX-based techniques create the necessary clients and agencies on the brand new nodes. On windows-primarily based systems, you don't deserve to create clients and groups, but the user that performs the cloning may still be the identical user that performed the installation.
Extract the tar file, or unzip the zip file, and run the Oracle ordinary Installer (OUI) in clone mode as described within the Oracle regular Installer and OPatch consumer's guide. Then run the setting up scripts and repeat these steps on each node that you're including. The procedure for cloning the Oracle home onto new nodes is akin to the process for cloning the Oracle Clusterware home. furthermore, you ought to run the Oracle web Configuration Assistant (NETCA) on each and every new node to create a Listener.
in case you have not already created a database, then which you could run the Database Configuration Assistant (DBCA) to create one. finally, comply with the put up-cloning procedures to complete the extension of your Oracle RAC atmosphere onto the new nodes.extra concerns and contours for Oracle true utility Clusters
moreover configuring services to control your workloads, also believe the usage of the following features should you install Oracle RAC:
Scaling Your Oracle RAC Database—As mentioned, that you could add nodes and situations to your Oracle RAC atmosphere the use of Oracle cloning. in case you decide to now not use cloning, then that you may extend your database by using the manual tactics that are described in Chapter 10, "adding and Deleting Nodes and instances on UNIX-based systems" or Chapter eleven, " including and Deleting Nodes and situations on home windows-based systems".
enterprise manager—Use commercial enterprise manager to administer your total Oracle RAC ambiance, not just the Oracle RAC database. Use business supervisor to create and adjust functions, and to delivery and prevent the cluster database situations and the cluster database. enterprise manager has extra facets as distinct in the section "Overview of the use of enterprise supervisor with Oracle precise software Clusters".
recuperation supervisor (RMAN)—RMAN backs up, restores, and recovers datafiles, manage data, server parameter info (SPFILEs) and archived redo logs. you can use RMAN with a media supervisor to back up files to exterior storage. that you would be able to also configure parallelism when backing up or recovering Oracle RAC databases. In Oracle RAC, RMAN channels can also be dynamically allotted throughout all the Oracle RAC circumstances. Channel failover makes it possible for failed operations on one node to continue on an additional node. which you could use RMAN in Oracle RAC from the Oracle commercial enterprise manager Backup manager or from a command line.
automated undo management—automatically manages undo processing.
automated section house administration (ASSM)—immediately manages segment freelists and freelist companies.
in the community managed tablespaces—Enhances space management performance.
Cluster Verification Utility (CVU)—Use CVU to verify the reputation of your clusterware in case you event problems or use it on every occasion you reconfigure your cluster.
Sequences—if you use sequence numbers, then at all times use CACHE with the NOORDER option for foremost sequence quantity era performance. With the CACHE alternative, although, you may additionally have gaps within the sequence numbers. in case your atmosphere can not tolerate sequence number gaps, then use the NOCACHE option or accept as true with pre-producing the sequence numbers. in case your utility requires sequence quantity ordering but can tolerate gaps, then use CACHE and ORDER to cache and order sequence numbers in Oracle RAC. if your application requires ordered sequence numbers devoid of gaps, then use NOCACHE and ORDER. This aggregate has the most terrible impact on efficiency compared to different caching and ordering mixtures.
Indexes—if you use indexes, agree with options, comparable to reverse key indexes, to optimize index efficiency. Reverse key indexes are primarily constructive when you've got normal inserts to 1 side of an index, corresponding to indexes that are based on insert date.
This part describes right here Oracle RAC ambiance management themes:Designing Oracle actual application Clusters Environments
accept as true with performing here steps right through the design and building of purposes that you're deploying on an Oracle RAC database. trust tuning:
The design and the utility
The reminiscence and that i/O
The operating gadget
observe:If an application does not scale on an SMP computer, then relocating the utility to an Oracle RAC database can not enrich performance.
agree with the usage of hash partitioning for insert-intensive online transaction processing (OLTP) applications. Hash partitioning:
Reduces competition on concurrent inserts right into a single database structure
impacts sequence-based indexes when indexes are locally partitioned with a table and tables are partitioned on sequence-based keys
Is transparent to the application
if you hash partitioned tables and indexes for OLTP environments, then which you can greatly enrich performance to your Oracle RAC database. notice that you simply can't use index latitude scans on an index with hash partitioning.
if you're the use of sequence numbers, then always use the CACHE alternative. in case you use sequence numbers with the CACHE option, then:Administrative tools for Oracle precise software Clusters Environments
Oracle allows for you to administer a cluster database as a single equipment graphic via business supervisor, SQL*Plus, or through Oracle RAC command-line interfaces corresponding to Server handle (SRVCTL). that you may also use a number of tools and utilities to manage your Oracle RAC atmosphere and its add-ons as follows:
business manager—business supervisor has each the Database handle and Grid manage GUI interfaces for managing each single illustration and Oracle RAC environments.
Cluster Verification Utility (CVU)—CVU is a command-line device that you can use to assess quite a number cluster and Oracle RAC-certain add-ons reminiscent of shared storage contraptions, networking configurations, equipment requirements, and Oracle Clusterware, as well as working gadget organizations and clients. that you may use CVU for pre-installation checks in addition to for put up-installation checks of your cluster ambiance. CVU is specially positive all through pre-setting up and right through installation of Oracle Clusterware and Oracle RAC add-ons. The OUI runs CVU after Oracle Clusterware and the Oracle installation to check your ambiance.
Server manage (SRVCTL)—SRVCTL is a command-line interface that you can use to manipulate an Oracle RAC database from a single point. that you may use SRVCTL to birth and forestall the database and instances and to delete or circulation instances and features. that you could also use SRVCTL to control configuration tips.
See additionally:Appendix E for more information about SRVCTL
Cluster ready functions manage (CRSCTL)—CRSCTL is a command-line tool for you to use to manage Oracle Clusterware. which you can use CRSCTL to birth and prevent Oracle Clusterware. CRSCTL has many alternate options comparable to enabling online debugging,
Oracle Interface Configuration device (OIFCFG)—OIFCFG is a command-line device for each single-instance Oracle databases and Oracle RAC environments that you can use to allocate and de-allocate network interfaces to add-ons. you could also use OIFCFG to direct accessories to use certain community interfaces and to retrieve part configuration counsel.
OCR Configuration tool (OCRCONFIG)—OCRCONFIG is a command-line tool for OCR administration. that you may additionally use the OCRCHECK and OCRDUMP utilities to troubleshoot configuration complications that affect the OCR.
net-based mostly business supervisor Database control and Grid manage permit you to computer screen an Oracle RAC database. The enterprise manager Console is a important factor of manage for the Oracle environment that you just entry by the use of a graphical person interface (GUI). Use the enterprise manager Console to initiate cluster database management projects. Use commercial enterprise supervisor Grid handle to manage assorted Oracle RAC databases. additionally notice the following features about monitoring Oracle RAC environments:
The international views, or GV$ views, are in keeping with V$ views. The catclustdb.sql script creates the GV$ views. Run this script if you don't create your database with DBCA. in any other case, DBCA runs this script for you.
Statspack is Oracle RAC-mindful.
observe:instead of the use of Statspak, Oracle recommends that you just use the extra sophisticated administration and monitoring facets of the Oracle Database 10g Diagnostic and Tuning packs which encompass the automated Database Diagnostic computer screen (ADDM).
You don't deserve to operate particular tuning for Oracle RAC; Oracle RAC scales devoid of particular configuration alterations. in case your utility carried out well on a single-instance Oracle database, then it's going to function neatly in an Oracle RAC atmosphere. lots of the tuning tasks that you'd operate on a single-illustration Oracle database can also increase Oracle RAC database performance. here's very true if your ambiance required scalability across a stronger number of CPUs.
one of the most Oracle RAC efficiency features are:
Dynamic aid Allocation
Cache Fusion permits A Simplified Tuning Methodology
You should not have to tune any parameters for Cache Fusion
No software-degree tuning is crucial
that you could use a bottom-up tuning method with basically no effect on your present purposes
more targeted performance information
supply: Oracle corporation
November 15, 2010 08:00 ET
Simplifies Deployment of a totally purchasable, Virtualized Database
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wonderful combination of Virtualization and Clustering Speeds Time to Market and allows bigger Availability
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If you use Oracle technologies, you may be relying on Oracle Enterprise Manager (OEM) to manage your clouds, applications and databases. But if you’re responsible for multiple environments with hundreds of databases as well as Oracle Real Application Clusters (RACs) and Oracle Exadata, then OEM alone will not enable you to do your job effectively.Download PDF
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The Oracle 12c Database is now generally available, with its most touted aspect being a database virtualization feature called Pluggable Databases.
The Redwood Shores, Calif.-based IT company announced Oracle 12c Database at its OpenWorld show last year, but at the time the product had been in beta mode for months. Now it is available for download on Linux and Solaris, with an official version number of Oracle Database 188.8.131.52. Mike Dietrich, a senior principal technologist who announced the general availability in a blog post, wrote in comments below the post that Oracle 12c Database will be supported on Microsoft Windows Server and IBM AIX operating systems, but he wouldn't say when.
"I'm looking forward to downloading 12c and trying it out," said Bobby Durrett, lead Oracle DBA at US Foods. "Unfortunately, they don't have 32-bit Windows or Linux versions out -- just 64-bit Linux and a couple Solaris 64-bit versions."
Durrett added that his focus for US Foods is to upgrade its key systems to the most stable release of Oracle Database 11.2. Oracle 12c Database is further down the upgrade path.Pluggable Databases, now called Oracle Multitenant
The most-talked about feature of Oracle 12c Database has been Pluggable Databases, and database administrators (DBAs) said this week they were interested in exploring the cost benefits around it. The feature, now called Oracle Multitenant, essentially allows a database administrator to set up a container database with multiple pluggable databases inside. During patches and upgrades, only the container database needs changing. Also, a pluggable database can be moved to another container database, either on the same server or somewhere else in the network.
But it will come at a cost. On the Oracle price list, updated this week, the feature is called "multitenant." It will cost about $21,000 per processor or $430 per user in a named user plus licensing scenario.
"With Pluggable Databases there are things you can consolidate, and possibly you can save on the other side, with database management and maintenance," said Michelle Malcher, a DBA, Oracle ACE Director and president of the Independent Oracle Users Group. "I think it's a great option to start to play with; to see what use cases there are."
Amit Das, database engineering architect at PayPal, said Pluggable Databases was one of the top features he was looking at with Oracle 12c Database. Another feature that interests Das is Flex Automatic Storage Management (ASM), which requires fewer ASM instances when running Oracle Real Application Clusters (RAC).
"We have some plans to use this soon," he said.
Malcher added that new security features in Oracle 12c Database are easy to implement and "closer to the core of the database." One of them is called Oracle Advanced Security Data Redaction, which can hide data from SQL query results prior to display based on factors such as a user's IP address.
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