Oracle 19c Failover Steps

  • Check the standby server:
    • SQL> SELECT database_role FROM v$database;
  • Stop the MRP process and switch to primary mode:
    • SQL> RECOVER MANAGED STANDBY DATABASE CANCEL;
SQL> ALTER DATABASE RECOVER MANAGED STANDBY DATABASE FINISH;
SQL> ALTER DATABASE ACTIVATE STANDBY DATABASE;
SQL> ALTER SYSTEM SET LOG_ARCHIVE_DEST_STATE_2=DEFER SCOPE=BOTH SID='*';
  • Restart the standby database and verify it is in primary mode:
    • SQL> SHUTDOWN IMMEDIATE;
SQL> STARTUP;
SQL> SELECT database_role FROM v$database;
  • For setups with two or more standby servers:

    • Check the data flow between standby servers. If an issue occurs with redirect_dml mode, restart the standby servers to resolve the problem.

Note: Ensure the failover process is monitored carefully to avoid data inconsistencies.

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