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This chapter introduces Oracle Clusterware and Oracle precise utility Clusters (Oracle RAC) via describing these items as well as a way to install, administer, and set up them. This chapter describes Oracle Clusterware and Oracle RAC architectures as well as the utility and hardware add-ons for both of these items. This chapter additionally in brief describes workload administration, features, and excessive availability for both single-example Oracle databases and Oracle RAC environments. This chapter includes the following topics:Oracle Clusterware and Oracle true application Clusters
A cluster includes multiple interconnected computer systems or servers that appear like they're one server to conclusion users and purposes. Oracle Database 10g true utility Clusters (Oracle RAC) allows the clustering of the Oracle Database. Oracle RAC makes use of Oracle Clusterware for the infrastructure to bind multiple servers so that they operate as a single system.
Oracle Clusterware is a portable cluster administration solution it really is built-in with the Oracle database. The Oracle Clusterware is also a required component for using Oracle RAC. additionally, Oracle Clusterware enables both single-illustration Oracle databases and Oracle RAC databases to use the Oracle high availability infrastructure. The Oracle Clusterware makes it possible for you to create a clustered pool of storage for use by way of any mixture of single-illustration and Oracle RAC databases.
Oracle Clusterware is the most effective clusterware that you simply need for many systems on which Oracle RAC operates. which you can also use clusterware from different vendors if the clusterware is certified for Oracle RAC.
Single-example Oracle databases have a one-to-one relationship between the Oracle database and the example. Oracle RAC environments, although, have a one-to-many relationship between the database and circumstances. In Oracle RAC environments, the cluster database cases entry one database. The mixed processing vigor of the distinct servers can supply enhanced throughput and scalability than is accessible from a single server. Oracle RAC is the Oracle Database choice that gives a single device picture for dissimilar servers to access one Oracle database. In Oracle RAC, each Oracle example constantly runs on a separate server.
Oracle RAC is a different know-how that provides excessive availability and scalability for all application forms. The Oracle RAC infrastructure is also a key component for enforcing the Oracle business grid computing architecture. Having distinctive situations access a single database prevents the server from being a single element of failure. Oracle RAC allows for you to mix smaller commodity servers right into a cluster to create scalable environments that support mission important enterprise functions. applications that you just installation on Oracle RAC databases can operate without code alterations.The Oracle Clusterware architecture and Oracle Clusterware Processing
The Oracle Clusterware is software that after installed on servers running the equal working device, enables the servers to be sure together to operate as if they have been one server. The Oracle Clusterware requires two clusterware accessories: a voting disk to list node membership assistance and the Oracle Cluster Registry (OCR) to record cluster configuration assistance. The balloting disk and the OCR must dwell on shared storage. The Oracle Clusterware requires that every node be connected to a non-public network by way of a non-public interconnect.
The private interconnect that Oracle Clusterware requires is a separate community that you just configure between the cluster nodes. This interconnect, which is required by means of Oracle RAC, can also be the same community that the clusterware makes use of, but the interconnect should still no longer be obtainable by way of nodes that aren't a part of the cluster.
Oracle recommends that you configure a redundant interconnect to keep away from the interconnect from being a single element of failure. Oracle also recommends that you simply use user Datagram Protocol (UDP) on a Gigabit Ethernet in your cluster interconnect. Crossover cables aren't supported for use with Oracle Clusterware or Oracle RAC databases.
The Oracle Clusterware manages node membership and prevents cut up mind syndrome during which two or greater instances try to manage the database. this may happen in instances where there's a damage in verbal exchange between nodes throughout the interconnect.
The Oracle Clusterware structure supports excessive availability by way of immediately restarting stopped add-ons. The Oracle Clusterware can immediately re-start a node to steer clear of complications with that node from affecting the supply of the relaxation of the Oracle RAC ambiance. In an Oracle RAC atmosphere, all Oracle methods are below the manage of the Oracle clusterware. The Oracle Clusterware also provides an software programming interface (API) that permits you to control other Oracle approaches with Oracle Clusterware.Oracle Clusterware application element Processing particulars
The Oracle Clusterware includes several heritage techniques that facilitate cluster operations. The Cluster Synchronization carrier (CSS), adventure management (EVM), and Oracle Cluster components speak with other cluster component layers in the other situations in the same cluster database environment. These add-ons are also the main conversation hyperlinks between the Oracle Clusterware high availability components and the Oracle Database. additionally, these add-ons display screen and control database operations.
the following record describes the functions of some of the main Oracle Clusterware components. This record comprises these add-ons that are approaches on Unix and Linux working techniques or services on windows.
word:On home windows-primarily based working techniques, many of the components are threads of the Oracle technique instead of separate strategies.
Cluster Synchronization features (CSS)—Manages the cluster configuration with the aid of controlling which nodes are members of the cluster and by notifying individuals when a node joins or leaves the cluster. if you are the usage of third-celebration clusterware, then the css method interfaces together with your clusterware to control node membership assistance.
Cluster competent services (CRS)—The basic software for managing excessive availability operations within a cluster. anything else that the crs method manages is called a cluster useful resource which could be a database, an instance, a provider, a Listener, a virtual IP (VIP) address, an utility procedure, etc. The crs manner manages cluster substances in keeping with the aid's configuration assistance that's saved in the OCR. This comprises beginning, cease, video display and failover operations. The crs technique generates movements when a resource reputation adjustments. in case you have put in Oracle RAC, crs screens the Oracle instance, Listener, and so forth, and immediately restarts these accessories when a failure happens. via default, the crs method makes five makes an attempt to restart a useful resource after which doesn't make extra restart attempts if the resource doesn't restart.
event administration (EVM)—A history method that publishes routine that crs creates.
Oracle Notification service (ONS)—A publish and subscribe carrier for speaking quick application Notification (FAN) movements.
RACG—Extends clusterware to guide Oracle-selected requirements and sophisticated supplies. Runs server callout scripts when FAN pursuits turn up.
procedure video display Daemon (OPROCD)—This manner is locked in memory to monitor the cluster and provide I/O fencing. OPROCD performs its determine, stops running, and if the wake up is past the anticipated time, then OPROCD resets the processor and reboots the node. An OPROCD failure consequences in Oracle Clusterware restarting the node. OPROCD makes use of the hangcheck timer on Linux structures.
In the following table, if a technique has a (r) beside it, then the procedure runs as the root person. in any other case the method runs as the oracle user.
table 1-1 record of strategies and home windows features associated with Oracle ClusterwareOracle Clusterware element Linux/Unix method windows amenitiesWindows procedures
process monitor Daemon
Oracle Notification provider (ONS)
evmd (r), evmd.bin, evmlogger
Cluster Synchronization capabilities
init.cssd (r), ocssd (r), ocssd.bin
ocssd.exeThe Oracle Clusterware application accessories
When Oracle Clusterware operates, a number of platform-selected approaches or capabilities will also be working on each and every node within the cluster to help Oracle Clusterware. The Oracle Clusterware platform-certain UNIX-primarily based methods and windows-primarily based capabilities are described under here headings:Oracle Clusterware processes on UNIX-based mostly techniques
The Oracle Clusterware methods on UNIX-based systems are:
crsd—Performs high availability healing and management operations similar to preserving the OCR and managing utility supplies. This manner runs as the root person, or by using a person within the admin group on Mac OS X-primarily based techniques. This manner restarts immediately upon failure.
evmd—event supervisor daemon. This method additionally begins the racgevt procedure to manipulate FAN server callouts.
ocssd—Manages cluster node membership and runs because the oracle consumer; failure of this process consequences in cluster restart.
oprocd—manner display screen for the cluster. notice that this method handiest looks on systems that don't use vendor clusterware with Oracle Clusterware.
be aware:Oracle RAC on Linux platforms can have dissimilar threads that seem as separate techniques with separate system identifiers. Oracle Clusterware services on windows-based systems
The Oracle Clusterware functions on home windows-based methods are:
OracleCRService—Performs excessive availability recovery and administration operations reminiscent of keeping the OCR and managing software supplies. This process runs as the root consumer, or by using a person in the admin group on Mac OS X-based techniques. This process restarts immediately upon failure.
OracleCSService—Manages cluster node membership and runs as oracle consumer; failure of this technique results in cluster restart.
OracleEVMService—experience supervisor daemon. This procedure additionally starts the racgevt system to control FAN server callouts.
OraFenceService—technique monitor for the cluster. observe that this procedure most effective seems on systems that don't use supplier clusterware with Oracle Clusterware.
An Oracle RAC database is a logically or physically shared every thing database. All datafiles, control info, PFILEs, and redo log files in Oracle RAC environments ought to stay on cluster-aware shared disks so that all the cluster database cases can entry them. the entire situations should also share the same interconnect. additionally, 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 everything architecture, Oracle RAC requires cluster-conscious storage for all database information. it's your choice as to the way to configure your disk, but you should use a supported cluster-aware storage solution. Oracle Database 10g gives computerized Storage management (ASM), which is the suggested solution to manipulate your disk. however you might also also use a cluster-mindful extent supervisor or a cluster file equipment (now not required). In Oracle RAC, the Oracle Database application manages disk access and the Oracle software is certified to be used on a whole lot of storage architectures. An Oracle RAC database can have as much as a hundred instances. counting on your platform, that you can use right here file storage alternate options for Oracle RAC:
ASM, which Oracle recommends
Oracle Cluster File equipment (OCFS), which is accessible for Linux and windows structures, or a 3rd-birthday celebration cluster file system that is certified for Oracle RAC
A community file gadget
Oracle RAC databases range architecturally from Oracle RACsingle-instance Oracle databases in that every Oracle RAC database example also has:
All nodes in an Oracle RAC ambiance need to hook up with a native area network (LAN) to allow users and purposes to access the database. functions should use the Oracle Database services feature to connect to an Oracle database. services enable you to define suggestions and traits to manage how clients and purposes connect to database cases. These traits include a unique name, workload balancing and failover options, and excessive availability qualities. Oracle internet capabilities allows the weight balancing of utility connections throughout the entire circumstances in an Oracle RAC database.
users can entry an Oracle RAC database using a shopper-server configuration or through one or more center tiers, with or without connection pooling. users can also be DBAs, developers, utility users, energy users, such as records miners who create their personal searches, and the like.
Most public networks customarily use TCP/IP, however which you could use any supported hardware and utility mixture. Oracle RAC database instances can be accessed via a database's defined, default IP handle and through VIP addresses.
word:do not to make use of the interconnect or the private community for person communication as a result of Cache Fusion uses the private interconnect for inter-instance communications.
moreover the node's host name and IP handle, you should also assign a digital host identify and an IP handle to each and every node. The virtual host identify or VIP should be used to hook up with the database example. for instance, you may enter the digital host name CRM within the handle checklist of the tnsnames.ora file.
A digital IP handle is another public tackle that client connections use in its place of the typical public IP tackle. To configure VIP addresses, you need to reserve a spare IP address for every node that uses the same subnet because the public community.
If a node fails, then the node's VIP fails over to one other node on which the VIP can not settle for connections. generally, 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. shoppers that attempt to connect to the VIP get hold of a quick connection refused error as a substitute of awaiting TCP join timeout messages. You configure VIP addresses within the handle listing in your database connection definition to enable connectivity. the following area describes the Oracle RAC software components in more detail.The Oracle precise utility Clusters application accessories
Oracle RAC databases have two or greater database situations that every include memory constructions and history procedures. An Oracle RAC database has the equal methods and reminiscence constructions as a single-illustration Oracle database in addition to additional method and reminiscence structures that are particular to Oracle RAC. any one instance's database view is well-nigh similar to any other instance's view in the identical Oracle RAC database; the view is a single equipment picture of the ambiance.
every illustration has a buffer cache in its equipment global area (SGA). the usage of Cache Fusion, Oracle RAC environments logically mix each example's buffer cache to enable the instances to system records as if the facts resided on a logically combined, single cache.
notice:The SGA size necessities for Oracle RAC are more desirable than the SGA requirements for single-instance Oracle databases because of Cache Fusion.
To make certain that each Oracle RAC database example obtains the block that it must fulfill a question or transaction, Oracle RAC situations use two processes, the global Cache carrier (GCS) and the world Enqueue carrier (GES). The GCS and GES keep information of the statuses of each information file and every cached block the usage of a global aid listing (GRD). The GRD contents are distributed throughout all the energetic cases, which easily raises the dimension of the device world enviornment for an Oracle RAC example.
After one example caches information, some other instance within the same cluster database can purchase a block graphic from an extra instance in the equal database sooner than through analyzing the block from disk. therefore, Cache Fusion strikes present blocks between cases as opposed to re-studying the blocks from disk. When a consistent block is needed or a changed block is required on yet another illustration, Cache Fusion transfers the block graphic directly between the affected situations. Oracle RAC makes use of the inner most interconnect for inter-illustration verbal exchange and block transfers. The world Enqueue service video display and the illustration Enqueue process manages entry to Cache Fusion components in addition to enqueue recuperation processing.
These Oracle RAC procedures and the GRD collaborate to permit Cache Fusion. The Oracle RAC methods and their identifiers are as follows:
LMS—international Cache carrier technique
LMD—international Enqueue carrier Daemon
LMON—world Enqueue service computer screen
LCK0—instance Enqueue manner
if you use network connected Storage (NAS), then you definitely are required to configure a second private community. access to this community is customarily managed through the dealer's application. The inner most network makes use of static IP addresses.
observe:lots of the Oracle add-ons that this area describes are apart from the components which are described for single-illustration Oracle databases in Oracle Database concepts. Oracle Clusterware accessories and high Availability
if you happen to mix Oracle Clusterware and Oracle RAC, that you could achieve outstanding scalability and excessive availability. The Oracle Clusterware achieves this the usage of the accessories that this area describes under here topics:The Oracle Clusterware vote casting Disk and Oracle Cluster Registry
The Oracle Clusterware requires the following two essential information:
vote casting Disk—Manages cluster membership by means of a fitness investigate and arbitrates cluster ownership among the situations in case of network disasters. Oracle RAC uses the balloting disk to assess which circumstances are members of a cluster. The balloting disk must stay on shared disk. for prime availability, Oracle recommends that you've varied voting disks. The Oracle Clusterware allows for dissimilar balloting disks but you ought to have an strange variety of voting disks, equivalent to three, five, and the like. if you define a single voting disk, then be sure to use exterior mirroring to provide redundancy.
Oracle Cluster Registry (OCR)—keeps cluster configuration suggestions as well as configuration guidance about any cluster database inside the cluster. The OCR additionally manages advice about tactics that Oracle Clusterware controls. The OCR shops configuration tips in a series of key-value pairs inside a listing tree constitution. The OCR must stay on shared disk it truly is attainable with the aid of the entire nodes in your cluster. The Oracle Clusterware can multiplex the OCR and Oracle recommends that you just use this characteristic to make sure cluster high availability. that you would be able to change a failed OCR on-line, and you'll replace the OCR via supported APIs reminiscent of business supervisor, the Server manage Utility (SRVCTL), or the Database Configuration Assistant (DBCA).
notice:each the balloting disks and the OCRs ought to dwell on either cluster file system files or on shared raw devices that you configure before you install Oracle Clusterware and Oracle RAC. Oracle Clusterware excessive Availability and the application Programming Interface
Oracle Clusterware provides a excessive availability utility programming interface (API) so that you can use to permit Oracle Clusterware to control functions or tactics that run a cluster. This permits you to deliver excessive availability for all your purposes. The Oracle Clusterware with ASM permits you to create a consolidated pool of storage to guide both the one-illustration Oracle databases and the Oracle RAC databases that are operating on your cluster.
To hold excessive availability, Oracle Clusterware add-ons can respond to repute alterations to restart functions and tactics in line with defined excessive availability suggestions. moreover, which you could use the Oracle Clusterware excessive availability framework by using registering your applications with Oracle Clusterware and configuring the clusterware to start, stop, or relocate your software approaches. it's, you can make customized applications totally accessible through the use of Oracle Clusterware to create profiles that video display, relocate, and restart your functions. The Oracle Clusterware responds to FAN events that are created with the aid of an Oracle RAC database. Oracle announces FAN events when cluster servers may additionally turn into unreachable and network interfaces are slow or non-practical.Workload administration with Oracle actual utility Clusters
Workload administration makes it possible for you to manipulate the distribution of workloads to provide gold standard efficiency for clients and purposes. This contains proposing the maximum availability for database connections, fast failure recovery, and balancing workloads optimally across the energetic configuration. Oracle Database 10g with Oracle RAC comprises many points that can raise workload management akin to connection load balancing, quick connection failover (FCF), the load balancing advisory, and Runtime Connection Load Balancing. Workload management gives the most excellent merits to Oracle RAC environments. that you could, youngsters, take talents of workload management by using Oracle functions in single-illustration Oracle Databases, primarily people that use facts defend or Streams. Workload administration includes here add-ons:
excessive Availability Framework—The Oracle RAC high availability framework allows the Oracle Database to retain components in a running state always. Oracle high availability implies that Oracle Clusterware monitors and restarts critical components if they stop, unless you override the restart processing. The Oracle Clusterware and Oracle RAC additionally provide alerts to purchasers when configurations exchange. This enables purchasers to immediately react to the alterations, enabling application builders to cover outages and reconfigurations from end users. The scope of Oracle high availability spans from the restarting of stopped Oracle tactics in an Oracle database instance to failing over the processing of a whole instance to other accessible situations.
Load Balancing Advisory—this is the means of the database to give assistance to purposes concerning the current provider ranges being provided with the aid of the database and its cases. functions can take advantage of this counsel to direct connection requests to the example so that it will supply the software request with the most effective provider satisfactory to comprehensive the application's processing. Oracle has integrated its Java Database Connectivity (JDBC) and Oracle information company for .web (ODP.net) connection swimming pools to work with the weight balancing counsel. functions can use the integrated connection pools without programmatic changes.
functions—Oracle Database 10g introduces a powerful automated workload management facility, called services, to allow the business grid vision. functions are entities that you can outline in Oracle RAC databases. capabilities enable you to community database workloads and route the work to the surest circumstances that are assigned to technique the provider. furthermore, you could use services to outline the resources that Oracle assigns to technique workloads and to computer screen workload resources. purposes that you just assign to functions transparently purchase the described workload management qualities, together with excessive availability and load balancing suggestions. Many Oracle database aspects are built-in with functions, comparable to useful resource supervisor, which makes it possible for you to preclude the supplies that a service can use inside an illustration. Some database points are additionally integrated with Oracle Streams, superior Queuing, to obtain queue location transparency, and the Oracle Scheduler, to map capabilities to particular job courses.
In Oracle RAC databases, the service performance guidelines that you just configure control the amount of labor that Oracle allocates to every accessible instance for that provider. As you extend your database through adding nodes, functions, add-ons of functions, and so on, which you could add extra services.
Connection Load Balancing— Oracle web capabilities provides connection load balancing for database connections. Connection load balancing happens when the connection is created. Connections for a given provider are balanced throughout the entire working situations that offer the carrier. remember to outline the way you want connections to be balanced within the service definition. although, you ought to still configure Oracle web capabilities. in case you allow the burden balancing advisory, the Listener uses the load balancing advisory for connection load balancing.
This area introduces the storage alternate options for Oracle RAC and the installation approaches for both Oracle Clusterware and Oracle RAC beneath the following issues:Oracle Clusterware setting up procedure Description
The Oracle Clusterware is allotted on the Oracle Database 10g installing media. The Oracle customary Installer (OUI) installs Oracle Clusterware right into a directory constitution, which can be called CRS_home, it really is become independent from other Oracle software operating on the laptop. as a result of Oracle Clusterware works intently with the working equipment, device administrator entry is required for some of the installation projects. moreover, one of the most Oracle Clusterware procedures should run because the gadget administrator, which is often the basis person on Unix and Linux systems and the gadget Administrator person on windows methods.
before you install Oracle Clusterware, Oracle recommends that you just run the Cluster Verification Utility (CVU) to make certain that your ambiance meets the Oracle Clusterware setting up necessities. The OUI additionally immediately runs CVU on the end of the clusterware setting up to determine numerous clusterware accessories. The CVU simplifies the installation, configuration, and normal administration of the Oracle Clusterware installation manner by way of making a choice on complications in cluster environments.
all the way through the Oracle Clusterware setting up, you have to identify three IP addresses for every node that goes to be a part of your setting up. One IP handle is for the deepest interconnect and the different is for the general public interconnect. The third IP address is the digital IP handle that purchasers will use to hook up with each and every example.
The Oracle Clusterware setting up manner creates the vote casting disk and OCR on cluster-conscious storage. in case you opt for the option for regular redundant copies throughout the installation method, then Oracle Clusterware automatically maintains redundant copies of these data to evade the data from fitting single features of failure. The normal redundancy characteristic also eliminates the want for third celebration storage redundancy solutions. when you use average redundancy, Oracle Clusterware automatically continues two copies of the Oracle Cluster Registry (OCR) file and three copies of the balloting Disk file.
notice:if you opt for exterior redundancy for the OCR and vote casting disk, then to allow redundancy, your disk subsystem have to be configurable for RAID mirroring. otherwise, your equipment may well be susceptible since the OCR and vote casting disk are single aspects of failure. Oracle real software Clusters setting up and Database creation procedure Description
The Oracle RAC application is allotted as a part of the Oracle Database 10g installation media. by default, the average Oracle Database 10g application installation process installs the Oracle RAC choice when it recognizes that you are performing the installing on a cluster. The OUI installs Oracle RAC into a listing constitution, which can be known as Oracle_home, that is break away other Oracle utility running on the computer. because OUI is cluster-aware, it installs the Oracle RAC software on all the nodes that you just described to be part of the cluster. if you're using a certified cluster file equipment for the Oracle domestic, then most effective select the node that you are connected to for the setting up.
You must first set up Oracle Clusterware before installation Oracle RAC. After Oracle Clusterware is operational, you could use OUI to installation the Oracle database application with the Oracle RAC add-ons. throughout the installation, OUI runs DBCA to create your Oracle RAC database in accordance with the alternate options that you simply select. The DBCA additionally runs the net Configuration Assistant (NETCA) to configure the network on your Oracle RAC environment.
Oracle recommends that you opt for ASM all the way through the setting up to simplify storage administration; ASM automatically manages the storage of all database info inside disk organizations. that you can also configure capabilities throughout setting up, depending on your processing necessities. when you are using the Oracle Database 10g common edition, then you definitely should use ASM for storing all of the database files.
by default, DBCA creates one service in your environment and this carrier is for the database. The default provider is purchasable on all instances in an Oracle RAC environment, except the database is in restrained mode.Cloning Oracle Clusterware and Oracle RAC utility in Grid Environments
This part in short summarizes the strategies for deploying Oracle RAC in grid environments which have large numbers of nodes using cloned photos for Oracle Clusterware and Oracle RAC. Oracle cloning is the favored method of extending your Oracle RAC atmosphere through including nodes and situations. To perform the cloning procedures that are summarized during this part, seek advice from the Oracle usual Installer and OPatch user's book.that you would be able to additionally use business manager Grid manage to perform cloning.
The cloning technique assumes that you efficaciously put in an Oracle Clusterware home and an Oracle domestic with Oracle RAC on as a minimum one node. additionally, all root scripts need to have run successfully on the node from which you're extending your cluster database. to use Oracle cloning, first clone the Oracle Clusterware home and then clone the Oracle home with the Oracle RAC utility.
To clone the Oracle Clusterware home, on UNIX-primarily based methods create a tar file of the Oracle Clusterware home and copy the file to the new node's Oracle Clusterware home. On windows-based mostly programs you have to create zip files. Then on UNIX-based mostly methods create the required clients and organizations on the new nodes. On windows-based mostly programs, you do not need to create users and companies, but 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 run the Oracle commonplace Installer (OUI) in clone mode as described in the Oracle time-honored Installer and OPatch user's ebook. Then run the setting up scripts and repeat these steps on each node that you are including. The technique for cloning the Oracle home onto new nodes is akin to the technique for cloning the Oracle Clusterware domestic. in addition, you must run the Oracle internet Configuration Assistant (NETCA) on every new node to create a Listener.
if you haven't already created a database, then that you may run the Database Configuration Assistant (DBCA) to create one. finally, observe the submit-cloning techniques to comprehensive the extension of your Oracle RAC ambiance onto the brand new nodes.further issues and lines for Oracle real software Clusters
besides configuring features to control your workloads, additionally agree with the usage of here facets for those who install Oracle RAC:
Scaling Your Oracle RAC Database—As outlined, which you can add nodes and circumstances to your Oracle RAC environment the usage of Oracle cloning. if you choose to no longer use cloning, then you could lengthen your database through the use of the manual procedures that are described in Chapter 10, "including and Deleting Nodes and situations on UNIX-based mostly methods" or Chapter eleven, " adding and Deleting Nodes and situations on home windows-primarily based techniques".
enterprise supervisor—Use enterprise manager to manage your complete Oracle RAC environment, now not just the Oracle RAC database. Use commercial enterprise manager to create and alter functions, and to beginning and prevent the cluster database situations and the cluster database. enterprise manager has additional features as designated within the area "Overview of the use of business supervisor with Oracle precise utility Clusters".
recuperation manager (RMAN)—RMAN backs up, restores, and recovers datafiles, control files, server parameter data (SPFILEs) and archived redo logs. which you can use RMAN with a media supervisor to lower back up files to exterior storage. you could additionally configure parallelism when backing up or convalescing Oracle RAC databases. In Oracle RAC, RMAN channels will also be dynamically allotted throughout all of the Oracle RAC circumstances. Channel failover allows failed operations on one node to proceed on an extra node. which you could use RMAN in Oracle RAC from the Oracle business supervisor Backup manager or from a command line.
automatic undo administration—automatically manages undo processing.
automatic phase area management (ASSM)—immediately manages phase freelists and freelist groups.
in the neighborhood managed tablespaces—Enhances space management efficiency.
Cluster Verification Utility (CVU)—Use CVU to determine the fame of your clusterware in case you journey problems or use it whenever you reconfigure your cluster.
Sequences—in case you use sequence numbers, then all the time use CACHE with the NOORDER option for top-rated sequence quantity era performance. With the CACHE alternative, despite the fact, you may additionally have gaps in the sequence numbers. in case your environment can not tolerate sequence quantity gaps, then use the NOCACHE option or trust pre-generating 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. in case your utility requires ordered sequence numbers devoid of gaps, then use NOCACHE and ORDER. This aggregate has essentially the most poor effect on performance in comparison to different caching and ordering combinations.
Indexes—in case you use indexes, agree with alternatives, akin to reverse key indexes, to optimize index efficiency. Reverse key indexes are specifically effective if in case you have common inserts to 1 facet of an index, similar to indexes which are in keeping with insert date.
This part describes right here Oracle RAC ambiance administration themes:Designing Oracle true application Clusters Environments
trust performing the following steps right through the design and development of functions that you are deploying on an Oracle RAC database. accept as true with tuning:
The design and the software
The reminiscence and i/O
The working device
word:If an application does not scale on an SMP computing device, then moving the utility to an Oracle RAC database can't enhance efficiency.
believe using hash partitioning for insert-intensive online transaction processing (OLTP) purposes. Hash partitioning:
Reduces competition on concurrent inserts right into a single database constitution
influences sequence-primarily based indexes when indexes are locally partitioned with a table and tables are partitioned on sequence-based mostly keys
Is clear to the application
if you hash partitioned tables and indexes for OLTP environments, then that you could vastly enrich performance to your Oracle RAC database. observe that you simply can not use index range scans on an index with hash partitioning.
if you're the usage of sequence numbers, then at all times use the CACHE choice. if you use sequence numbers with the CACHE option, then:Administrative equipment for Oracle precise application Clusters Environments
Oracle allows you to manage a cluster database as a single system image via commercial enterprise manager, SQL*Plus, or through Oracle RAC command-line interfaces akin to Server handle (SRVCTL). that you can additionally use a number of tools and utilities to control your Oracle RAC environment and its accessories as follows:
enterprise manager—commercial enterprise manager has each the Database manage and Grid control GUI interfaces for managing each single instance and Oracle RAC environments.
Cluster Verification Utility (CVU)—CVU is a command-line tool that you can use to determine a range of cluster and Oracle RAC-selected add-ons such as shared storage devices, networking configurations, device requirements, and Oracle Clusterware, as well as working equipment businesses and clients. that you can use CVU for pre-installation assessments as well as for publish-installation checks of your cluster environment. CVU is particularly beneficial all through pre-installation and all through installation of Oracle Clusterware and Oracle RAC add-ons. The OUI runs CVU after Oracle Clusterware and the Oracle installing to verify your ambiance.
Server control (SRVCTL)—SRVCTL is a command-line interface so you might use to manipulate an Oracle RAC database from a single point. you can use SRVCTL to start and stop the database and cases and to delete or flow circumstances and services. you can additionally use SRVCTL to control configuration information.
See additionally:Appendix E for greater advice about SRVCTL
Cluster competent services manage (CRSCTL)—CRSCTL is a command-line device that you can use to manipulate Oracle Clusterware. that you would be able to use CRSCTL to birth and forestall Oracle Clusterware. CRSCTL has many alternate options such as enabling online debugging,
Oracle Interface Configuration tool (OIFCFG)—OIFCFG is a command-line device for each single-instance Oracle databases and Oracle RAC environments so that you can use to allocate and de-allocate network interfaces to accessories. that you could additionally use OIFCFG to direct add-ons to make use of selected network interfaces and to retrieve component configuration tips.
OCR Configuration tool (OCRCONFIG)—OCRCONFIG is a command-line device for OCR administration. that you can additionally use the OCRCHECK and OCRDUMP utilities to troubleshoot configuration complications that have an effect on the OCR.
net-based enterprise manager Database handle and Grid control permit you to video display an Oracle RAC database. The commercial enterprise supervisor Console is a central element of manage for the Oracle atmosphere that you access by means of a graphical user interface (GUI). Use the business supervisor Console to provoke cluster database management tasks. Use business supervisor Grid manage to manage diverse Oracle RAC databases. additionally note the following elements about monitoring Oracle RAC environments:
The world views, or GV$ views, are in response to V$ views. The catclustdb.sql script creates the GV$ views. Run this script in case you do not create your database with DBCA. otherwise, DBCA runs this script for you.
Statspack is Oracle RAC-aware.
be aware:instead of the usage of Statspak, Oracle recommends that you just use the extra sophisticated administration and monitoring aspects of the Oracle Database 10g Diagnostic and Tuning packs which encompass the automatic Database Diagnostic computer screen (ADDM).
You do not deserve to function particular tuning for Oracle RAC; Oracle RAC scales with out particular configuration adjustments. in case your software carried out neatly on a single-instance Oracle database, then it's going to operate neatly in an Oracle RAC atmosphere. lots of the tuning projects that you'd perform on a single-illustration Oracle database can also increase Oracle RAC database performance. here is especially true in case your atmosphere required scalability across a more suitable variety of CPUs.
some of the Oracle RAC performance elements are:
Dynamic resource Allocation
Cache Fusion allows A Simplified Tuning Methodology
You don't have to tune any parameters for Cache Fusion
No utility-degree tuning is integral
which you could use a backside-up tuning strategy with almost no effect for your current applications
extra targeted performance records
source: Oracle agency
November 15, 2010 08:00 ET
Simplifies Deployment of a enormously accessible, Virtualized Database
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entertaining aggregate of Virtualization and Clustering Speeds Time to Market and makes it possible for larger Availability
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Oracle Database 11g Release 2 is available and downloadable recently from the Oracle Technology Network (OTN). This latest generation of the world’s #1 database builds on the innovations introduced in Oracle Database 11g to help organizations deliver better information throughout the enterprise, at a higher quality of service, and at a much lower cost.
In this release, Oracle Real Application Clusters (RAC) delivers grid plug and play and new server pooling capabilities that enable organizations to reduce their server costs by streamlining the provisioning and management of consolidated database grids.
Oracle RAC One Node, a new Database option, is available. Oracle RAC One Node is a solution that allows customers to more easily consolidate their less mission critical database environments on the grid with most of the redundancy and availability provided by Oracle Real Application Clusters.
The combination of Oracle Database 11g Release 2 Advanced Compression and Partitioning supports the reduction of storage costs by compressing data as much as 2-4x and simplifying use of lower cost storage tiers.
“Our customers want features that offer better performance and availability, lower IT costs and ways to deliver better information to their business users,” said Andy Mendelsohn, Senior Vice President of Database Server Technologies, Oracle. “The availability of Release 2 completes the vision of Oracle Database 11g to address today’s business and IT challenges, and continues their strategy of helping customers deliver the highest quality of service at lower cost.”
To read full press release, click here.
This BeyeNETWORK news item contains information from a recent press release by the company mentioned.
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® Real Application Clusters 11g. The combination of Oracle Real Application Clusters running on Voltaire's InfiniBand-based switches and software delivers faster application-level performance than clusters using Ethernet. The solution also 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 Real 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 Real Application Clusters in their large Oracle Database environment," said Jens-Christian Pokolm, Analyst IT Services, Postbank. "To deliver the best and most reliable service to their customers, their applications demand fast access to data and this solution truly delivers. An important capability this solution provides is the ability to eliminate latency and scale their Oracle Database applications."
"We are pleased to work with Voltaire to bring the industry standard OpenFabrics Reliable Datagram Sockets (RDS) over InfiniBand solution to the Oracle database environment," said Juan Loaiza, Senior Vice President, Oracle. "We believe that the OpenFabrics effort is crucial to the success of high 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 Real Application Clusters and Voltaire InfiniBand enables the deployment of database clusters that can run 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 center 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 Real Application Clusters are available today by calling 1-800-865-8247.
Voltaire will showcase its solutions for Oracle Real 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 business 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 need to be successful in today's global economy. Oracle partners are able to offer 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 business with Oracle qualify for the Certified Partner 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 include 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 have been sold to a wide range of end customers including governmental, research and educational organizations, as well as enterprises in the manufacturing, oil and gas, entertainment, life sciences and financial 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 Real Application Clusters (RAC) appliance that offers a lower cost entry point to Oracle Exadata, but it doesn’t include 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 end 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 include the Oracle Exadata Storage Server Software features such as hybrid columnar compression and smart scan that the company claims have given Exadata exponential query improvements.
“Oracle definitely needed something like this,” said Alex Gorbachev, chief technology officer (CTO) of Pythian, an Oracle consulting company that took part in the beta program for the new appliance. “A lot of customers couldn’t justify the cost of Exadata but could use some of the features that an integrated appliance can provide.”
It took Pythian “a couple hours” to set up the appliance, have it running and accepting data on it. Gorbachev added that normally a new system setup requires expertise from various IT departments: systems, storage, networking and database, for example. Configuring this new appliance doesn’t require that.
The appliance also comes with some management software that simplifies its operations and automates patching for example.
“It still requires some feeding and care when it comes to tuning, but other than that it’s removing a lot of overhead.”
That doesn’t mean it will eliminate the need for a DBA.
Kerry Osborne, chief information officer (CIO) at Enkitec, another Oracle consultancy that had an early look at the appliance, said end users won’t get the same performance that they would get out of Oracle Exadata. And they shouldn’t expect it either: The new product is a smaller, less-expensive version of Exadata, and as such it’s not going to have as many features. Osborne said it’s also not something you can throw in the corner and expect to run on its own.
“Anyone that thinks you can run 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 large enterprises,” he said.
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Magento [3 Certification Exam(s) ]
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mySQL [4 Certification Exam(s) ]
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Nokia [6 Certification Exam(s) ]
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Oracle [279 Certification Exam(s) ]
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PsychCorp [1 Certification Exam(s) ]
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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) ]
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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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