Friday, September 25, 2020
    Home Oracle Troubleshooting How to drop Oracle RAC database manually?

    How to drop Oracle RAC database manually?

    Hi Friends,

    Today we are discussing how to drop Oracle RAC database with Oracle RAC instances manually.

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    Take Example:
    Our Oracle RAC database name is RACDB
    Our Oracle RAC instances are 2 and both names RAC1 and RAC2.

    Dropping Oracle RAC database step by step as follows:

    1) First, use the command line and Stop database using srvctl command.
    srvctl stop database -d RACDB

    2) Now remove the database entry from crs (Cluster Ready Services)
    srvctl remove instance -d RACDB -i RAC1

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    srvctl remove instance -d RACDB -i RAC2

    srvctl remove database -d RACDB

    3) After finishing above steps, Start the database on first instance using sqlplus.
    SQL> startup

    SQL> alter system set cluster_database=false scope=spfile;

    SQL> alter system set cluster_database_instances=1 scope=spfile;

    SQL> alter database disable thread 2;

    4) Delete the unwanted thread and redo logfiles. Thread 1 is for active instance and other is for another instance. Drop all redo group of other thread. Ex: Group 4,5,6 are for other thread then drop as follows.

    SQL> select thread#, group# from v$log;

    SQL> alter database drop logfile group 4;

    SQL> alter database drop logfile group 5;

    SQL> alter database drop logfile group 6;

    5) Drop the unwanted undo tablespace

    SQL> drop tablespace UNDOTBS2 including contents and datafiles; create pfile from spfile;

    SQL> shut immediate

    After shutdowning Oracle database kindly ensure to “shutdown immediate” command should need to use. Don’t use “shutdown abort”

    7) Now start database again in mount stage

    SQL>startup mount restrict

    8) Drop database

    SQL>drop database;

    Your Oracle RAC database will be dropped with Oracle RAC instance smoothly.

    All the best.


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    1. Hi Tejas,

      Specially when we are providing remote Oracle RAC dba support because during remote dba support work we use only command line not using GUI.

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