When you initially define a catalog, you choose its attributes according to your expectations of what the catalog requires. These requirements can change over time. However, only a portion of a catalog's attributes can be altered.

To alter these alterable attributes:

1. Use the access method services ALTER command to change the desired attribute. For complete information on the ALTER command, and for examples of altering catalog attributes, see z/OS DFSMS Access Method Services Commands.
2. Close the catalog with MODIFY CATALOG,CLOSE so that the CAS control blocks for the catalog are refreshed.

If you want to alter attributes that are unalterable:

1. Lock the catalog using ALTER LOCK.
2. Export the catalog with EXPORT.
3. Delete the catalog with DELETE RECOVERY.
4. Define a catalog with the same name on the same device with the desired attributes. Specify LOCK so that the new catalog cannot be used.
5. Import the catalog into the newly defined catalog with IMPORT INTOEMPTY. Allow the command to default to UNLOCK, so that the catalog is unlocked.