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Delete Instance from Oracle RAC

    For Delete Instance from Oracle RAC

    Interactive Mode

    On a node you want to keep, start the DBCA utility.

    $ dbca

    Select the “Oracle Real Application Cluster (RAC) database” option and click the “Next” button.

    Select the “Instance Management” option and click the “Next” button.

    Select the “Delete an instance” option and click the “Next” button.

    Make sure the appropriate cluster database is selected, enter the credentials for a user with SYSDBA privilege and click the “Next” button.

    Select the instance to delete and click the “Next” button.

    You are presented with a similar screen again, but it now also has a “Finish” button. Click the “Finish” button.

    Click the “OK” button on the confirmation dialog.

    Wait while the instance is deleted.

    Silent Mode

    We could have achieved the same result using the DBCA in silent mode with the following command.

    $ dbca -silent -deleteInstance -nodeList ol5-112-rac2 -gdbName RAC -instanceName RAC2 -sysDBAUserName sys -sysDBAPassword myPassword
    Deleting instance
    20% complete
    21% complete
    22% complete
    26% complete
    33% complete
    40% complete
    46% complete
    53% complete
    60% complete
    66% complete
    Completing instance management.
    100% complete
    Look at the log file "/u01/app/oracle/cfgtoollogs/dbca/RAC.log" for further details.
    Post-Delete Checks

    Check the redo thread associated with the deleted node has been disabled. In this case we deleted the instance “RAC2” which was thread 2.

    SQL> select distinct thread# from v$log;

    If the thread associated with the deleted instance hans’t been disabled, do it manually.


    Check the instance information has been deleted from the OCR.

    $ srvctl config database -d RAC
    Database unique name: RAC
    Database name: RAC
    Oracle home: /u01/app/oracle/product/11.2.0/db_1
    Oracle user: oracle
    Spfile: +DATA/RAC/spfileRAC.ora
    Domain: localdomain
    Start options: open
    Stop options: immediate
    Database role: PRIMARY
    Management policy: AUTOMATIC
    Server pools: RAC
    Database instances: RAC1
    Disk Groups: DATA
    Mount point paths: 
    Type: RAC
    Database is administrator managed
    [[email protected] ~]$

    Remember to edit any service definitions that related to the deleted node.

    Also See:

    Oracle RAC

    Adding and Deleting Cluster Nodes