Recreating control file in RAC with noresetlogs

Question

Hi all,
I need to recreate the controlfile in a 2-node RAC environment (9i)
for altering the MAXLOGHISTORY value. I will be using noresetlogs as I
have all the online logs available with me.
I referred to metalink note (Note:118931.1) for the same, and to
clarify the same, it refers to set cluster_database to false and then
to true after creating the new controlfile.
Here I have Log Groups 1,2,5,6,7 belongs to instance1 and the rest belongs to
instance2
Below is the trace of controlfile...
create controlfile reuse database "prod" noresetlogs force logging
archivelog
maxlogfiles 64
maxlogmembers 3
maxdatafiles 800
maxinstances 32
maxloghistory 15000
logfile
group 1 '/dev/rprod_redo11' size 100m,
group 2 '/dev/rprod_redo12' size 100m,
group 3 '/dev/rprod_redo21' size 100m,
group 4 '/dev/rprod_redo22' size 100m,
group 5 '/dev/rprod_redo13' size 100m,
group 6 '/dev/rprod_redo14' size 100m,
group 7 '/dev/rprod_redo15' size 100m,
group 8 '/dev/rprod_redo23' size 100m,
group 9 '/dev/rprod_redo24' size 100m,
group 10 '/dev/rprod_redo25' size 100m
-- standby logfile
datafile
Please clarify on the same, do the traced controlfile need to have some thread info for redo logs & do I need to make the cluster_database parameter to fale/true.
Thanks!
Prat

Answer 1

1. Create the trace file (with Create control file statements..)
2. Edit the trace file, to remove the log groups which doesn't belong to Instance 1 (in you case you would be removing groups 3,4,8,9,10).
3. Shutdown all the instances.
4. edit the init.ora file to make CLUSTER_DATABASE=FALSE:
5. startup nomount instance 1.
6. Run the edited trace file to create the control file.
7. shutdown instance 1.
8. edit the init.ora file to make CLUSTER_DATABASE=TRUE;
9. Startup instance 1;
10. Add the log groups for the instance 2 (groups 3,4,8,9,10)
11. Add tempfiles as indicated in the trace file.
12. Enable thread 2;
13. Startup instance 2.
As always, take backups.
HTH
Thanks
Chandra