IMS catalog migration considerations

The IMS catalog is a HALDB PHIDAM database that can require special consideration when migrating to a new version, depending on changes to the IMS catalog itself or on changes made to other IMS functions that use the IMS catalog.

Normally, migrating an HALDB database requires that you unload the original database, change its DBD to the new version, reload the database with the new DBD, and then run the new version of the ACB Maintenance utility on the new DBDs and PSBs of the HALDB database.

However, when migrating the IMS catalog, you only need to run the new version of the ACB maintenance utility on the new DBDs and PSBs of the IMS catalog because the catalog DBD structures are identical across versions.