The changes implemented by the 18.0 catalog conversion utility are downward compatible through r14. If you need to fall back to one of these previous releases, you do not need to take any action regarding the catalog definitions.
Should it be necessary to reorganize (or unload and reload) a catalog updated by 18.0 CA IDMS after falling back to a release previous to r17, you may need to use the 18.0 version of the IDMSCATZ subschema rather than the earlier version. You need to use the 18.0 version of IDMSCATZ only if the catalog contains disk journal definitions and one of the following actions took place under 18.0 of CA IDMS:
Important! Converted definitions are not downward compatible with Release 12.0 or 12.01 of CA IDMS. For this reason, if you are upgrading from either of these releases, you must retain backup files of the catalog before converting it. If you need to fall back, you must restore the catalog and any database areas containing tables that were created or altered using the 18.0 version of the software.
You may need to increase the size of the XA storage pool (pool 255) due to increased storage requirements.
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