Fallback from a TDBM or DB2-based GDBM backend in z/OS IBM TDS to an earlier z/OS IBM TDS version

You might find it necessary to return to an earlier z/OS® IBM® TDS version after migrating to the current version of z/OS IBM TDS. Follow these procedures before running on a previous version of the server that is using the TDBM or DB2-based GDBM backends.

If you need to fallback to z/OS V1R11 IBM TDS, the fallback procedure is as follows if the serverCompatLevel configuration option is not set to 5 in the server configuration file. (If the serverCompatLevel configuration option is already set to 5, the server is already ready to run on z/OS V1R11 and it is not necessary to follow this fallback procedure):

Stop z/OS IBM TDS, if it is running.
Set the serverCompatLevel configuration option to 5.
Restart z/OS IBM TDS on the current z/OS release and then shut it down. It is now ready to run on z/OS V1R11 with the TDBM and DB2-based GDBM backends.

If you need to fallback to z/OS V1R12 or V1R13 IBM TDS, the fallback procedure is as follows if the serverCompatLevel configuration option is not set to 6 in the server configuration file. (If the serverCompatLevel configuration option is already set to 6, the server is already ready to run on z/OS V1R12 and it is not necessary follow this fallback procedure):

Stop z/OS IBM TDS, if it is running.
Set the serverCompatLevel configuration option to 6.
Restart z/OS IBM TDS on the current z/OS release and then shut it down. It is now ready to run on z/OS V1R12 with the TDBM and DB2-based GDBM backends.