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  • Oracle Clusterware !!!!!!!
    Saturday, August 30, 2008
    1) It was originally known as Oracle Parallel Server (OPS) and introduced in Oracle 6.0.35 (subsequently known as Oracle 6.2).

    2) The OPS code matured through Oracle?, Oracle8, and Oracle 8L In Oracle 9.0.1, OPS was relaunched as the RAC option. It has continued to mature in Oracle 9.2 and Oracle 10.

    3) Prior to Oracle 10.1, Clusterware was platform-dependent. On most platforms, Clusterware was provided by the hardware vendor. On Linux and Windows, however, the Clusterware was provided by Oracle.

    4) In Oracle 9.0.1 and 9.2 on Linux this was known as the Oracle Cluster Manager (oracm).

    5) In Oracle 10.1, Oracle supplies a complete, integrated Clusterware facility called Cluster Ready Services (CRS) on all platforms.

    6) In Oracle 10.2, CRS has been renamed to Oracle Clusterware and is mandatory in Linux RAC environments, since third-party Clusterware is not supported by Oracle on the Linux platform.

    7) Oracle Clusterware is installed as part of the RAC installation process.

    8) In a RAC environment it is necessary to install and configure Oracle Clusterware before installing the Oracle database software.

    - A separate ORACLE_HOME directory must be created for Oracle Clusterware.
    - This directory continues to be referred to as CRSHOME in the Oracle 10.1 CRS terminology.
    - Oracle Clusterware consists of the following components:
    - Cluster Synchronization Services (CSS): manages cluster node membership
    - Cluster Ready Services (CRS): performs management operations and high availability recovery
    - Event Manager (EVM): manages event notifications and callouts

    When Oracle Clusterware is installed, entries are added to the /etc/inittab file, and the in it process spawns the EVMD, OCSSD, and CRSD processes when the node is rebooted.

    In Oracle 10.2 and above, Oracle

    Clusterware can be started and stopped using the CRSCTL (Cluster Ready Services Control) command.

    Oracle Clusterware uses two additional files that must be accessible to all nodes. These are the Oracle Cluster Registry (OCR) and the voting disk.
    posted by Jaswinder Singh @ 1:08 AM  
    2 Comments:
    • At Friday, September 26, 2008, Blogger Unknown said…

      I am sorry to bother you but I am not sure how to get answer that I need.
      I am a finance professional who try to ultilize SQL query skill to create customized report from Oracle 11i financial ERP system. I am looking for data schema so that what tables/ojects are available and which of them should be joined to get what I need. Would you be able to help me how to find Oracle 11i financial database schema?
      Thansk.

       
    • At Tuesday, December 22, 2009, Anonymous ruandischer tee said…

      Oracle Clusterware is software that enables servers to operate together as if they are one server. Each server looks like any standalone server. However, each server has additional processes that communicate with each other so the separate servers appear as if they are one server to applications and end users.
      The benefits of using a cluster include:
      1.Scalability for applications
      2.Using lower-cost hardware
      3.Ability to fail over
      4.Ability to grow the capacity over time by adding servers, when needed.

       
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    About Me

    Name: Jaswinder Singh
    Home: Bangalore, Karnataka, India
    Certifications: RAC Certified Expert, OCP 9i, 10g & 11i
    About Me: I am working as APPSDBA, have hands on experience on DB RAC, HA on OAS 10g and Oracle Applications.
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