ORA-01618

This is my 100th post to this blog!!!

I am trying to duplicate a problem where I have threads 4, 5, and 6 in my primary and my standby has threads 1 and 2. When I did a switchover, everything was fine, but I could not switch back because the old primary, now the standby, is expecting redo from thread 4 which doesn’t exist in my new primary, the old standby. For my testing, I have a 2-node RAC primary and a 2-node RAC standby. Predictably, these both have threads 1 and 2. So I attempted to switch the primary to threads 3 and 4 by simply changing the THREADS parameter in the SPFILE. But on startup, I received:

PRCR-1079 : Failed to start resource ora.resp.db
CRS-5017: The resource action "ora.resp.db start" encountered the following error:
ORA-01618: redo thread 3 is not enabled - cannot mount
. For details refer to "(:CLSN00107:)" in "/u01/app/crs11.2.0.3/log/myhost01/agent/crsd/oraagent_oracle/oraagent_oracle.log".
CRS-2674: Start of 'ora.resp.db' on 'myhost01' failed
CRS-2632: There are no more servers to try to place resource 'ora.resp.db' on that would satisfy its placement policy
CRS-5017: The resource action "ora.resp.db start" encountered the following error:
ORA-01618: redo thread 4 is not enabled - cannot mount
. For details refer to "(:CLSN00107:)" in "/u01/app/crs11.2.0.3/log/myhost02/agent/crsd/oraagent_oracle/oraagent_oracle.log".
CRS-2674: Start of 'ora.resp.db' on 'myhost02' failed

This isn’t a simple parameter change. To get around this, we first have to create online redo logs to support the new threads:

SQL> alter database add logfile thread 3 group 30
  2  '/oracle_data/oradata/resp/redo30.log' size 52429312;
Database altered.
SQL> alter database add logfile thread 3 group 31
  2  '/oracle_data/oradata/resp/redo31.log' size 52429312;
Database altered.
SQL> alter database add logfile thread 4 group 40
  2  '/oracle_data/oradata/resp/redo40.log' size 52429312;
Database altered.
SQL> alter database add logfile thread 4 group 41
  2  '/oracle_data/oradata/resp/redo41.log' size 52429312;
Database altered.

Next, we enable the threads.

SQL> alter database enable public thread 3;
Database altered.
SQL> alter database enable public thread 4;
Database altered.

Lastly, we change the initialization parameters and bounce the instance:
SQL> alter system set thread=3 sid='resp1' scope=spfile;

System altered.

SQL> alter system set thread=4 sid='resp2' scope=spfile;

System altered.
Then bounce the instances with srvctl.

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Once everything was back up, I disabled threads 1 and 2.
SQL> alter database disable thread 1;
Database altered.
SQL> alter database disable thread 2;
Database altered.