Falling back in a data sharing environment

If you need to fall back to Version 8 or DB2® 9, you can fall back one member of the data sharing group at a time. Other members can continue to run while one member is falling back.

Before you begin

If all members have already been migrated to the new release, and you fall back one member at a time, the group is running in coexistence mode after the first member falls back.

To fall back to Version 8 or DB2 9:

1. Stop DB2 on the member that is falling back or stop DB2 on all members if you are falling back all members at once.
2. Run job DSNTIJFV to reactivate Version 8 or DB2 9 for that member or for all members.
3. Reconnect TSO, IMS™, CICS® to Version 8 or DB2 9.
4. Start Version 8 or DB2 9:
   1. Enter the command START DB2:
      1. Check for indoubt units of recovery.
      2. Check for outstanding restrictive states.
5. Modify your DSNTIJIC job to account for new table spaces that are added to the DB2 catalog in conversion mode (from Version 8 or DB2 9). This step prepares your DSNTIJIC job to be used in fallback mode.
   • 
     If you migrated to DB2 10 from Version 8, add the following table spaces to the Version 8 DSNTIJIC job:
     • DSNDB06.SYSCONTX
     • DSNDB06.SYSPLUXA
     • DSNDB06.SYSROLES
     • DSNDB06.SYSRTSTS
     • DSNDB06.SYSTARG
     • DSNDB06.SYSTSASC
     • DSNDB06.SYSTSUNI
     • DSNDB06.SYSXML
     
   • 
     If you migrated to DB2 10 from DB2 9, add the following table spaces to the DB2 9 DSNTIJIC job:
     • DSNDB06.SYSTSASC
     • DSNDB06.SYSTSUNI
     
   
6. Verify Version 8 or DB2 9.
7. Repeat steps 1 through 6 for each member (or all members) of the data sharing group.