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.
The following are the important attributes that can be altered:
- Buffer sizes (BUFFERSPACE, BUFND, BUFNI)
- FREESPACE
- MANAGEMENTCLASS
- SHAREOPTIONS
- STORAGECLASS
- STRNO
- WRITECHECK.
To alter these alterable attributes:
- 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.
- Close the catalog with MODIFY CATALOG,CLOSE so that the CAS control
blocks for the catalog are refreshed.
The following attributes are unalterable:
- CONTROLINTERVALSIZE
- DATACLASS
- RECORDSIZE
- REPLICATE or NOREPLICATE for index records.
If you want to alter attributes that are unalterable:
- Lock the catalog using ALTER LOCK.
- Export the catalog with EXPORT.
- Delete the catalog with DELETE RECOVERY.
- 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.
- Import the catalog into the newly defined catalog with IMPORT
INTOEMPTY. Allow the command to default to UNLOCK, so that the catalog
is unlocked.