Steps to address worst case scenario:-
1)Stop all DB2 instances,DAS & DB2 licenses:-
a) db2stop
b) db2licd -end (Must be launch on each node)
c) ipclean -a
d) db2_kill (Clean all DB2 Process)
e) ps –ef |grep –i db2 ( Check if still existing DB2 Process is running or not )
f) su - <das id>
g) db2admin stop
2) Have a Lower Level DB2 Fix Pack code in place for rollback.
3) Install DB2 Fix Pack from Lower Level as root
./installFixPack -b /opt/IBM/db2/V9.7 -f level
4) Downgrade DB2 Instance back to DB2 V9.7 as root
a) cd /opt/IBM/db2/V9.7FP/instance
b) ./db2iupdt -D <instance name>
5) Downgrade DB2 Admin Server ./dasupdt –D
6) If Fixpack is installed on separate path then go to old installation path & update the instance & bind packages.
cd /opt/IBM/db2/V9.7FP/instance
./db2iupdt -D instance name
7) Re-bind the bind files for each database.
8) Restore database from the backup taken prior the DB2 Fix Pack Upgrade .
9) Recycle DB2 instances & check instance & database health.
10) Application team to start the applications & perform verification