Maintaining the IMS catalog

The IMS catalog is an IMS HALDB full-function database, so even though it should not require much maintenance, the same maintenance considerations that apply to other HALDB full-function databases apply to the IMS catalog.

How often you need to reorganize or otherwise maintain the IMS catalog depends on how often your installation adds or updates the PSB and DBD records in the IMS catalog for new or changed databases and application programs in your IMS environment.

To reorganize the IMS catalog, use HALDB Online Reorganization (OLR) to avoid taking the IMS catalog offline. Because the IMS catalog is smaller than the typical HALDB database, running OLR on the IMS catalog should not significantly impact performance or resources.

If you can take the IMS catalog offline, you can reorganize the IMS catalog by using the HD Reorganization Unload utility (DFSURGU0) and the HD Reorganization Reload utility (DFSURGL0).

To clean out instances of PSBs and DBDs that are no longer needed from the IMS catalog, you can use the IMS Catalog Record Purge utility (DFS3PU10).