Recovering Shared Catalogs

When two or more systems share access to a user catalog and the user catalog is recovered on one of those systems to a different volume or device type, you will need to update or replace the catalog connector record in the master catalogs on the other systems. Otherwise, the recovery considerations for shared catalogs are the same as those described in Recovering a BCS.

The best way to update the catalog connector record on the sharing systems is to use the access method services IMPORT CONNECT ALIAS command. This command maintains any aliases already defined for the catalog. You can use this command even if the catalog has no aliases defined for it.

If you want to delete the aliases for a catalog, you can use EXPORT DISCONNECT followed by IMPORT CONNECT.

For example, the user catalog SYS1.ICFCAT.SHARED, which has many aliases, resides on volume 339001 (a 3390), and is shared by SYSTEMA and SYSTEMB. If SYS1.ICFCAT.SHARED is successfully recovered by SYSTEMA to volume 339002 (another 3390), SYS1.ICFCAT.SHARED is inaccessible to SYSTEMB because its connector record in SYSTEMB's master catalog has an incorrect volume serial number. Executing the following step on SYSTEMB updates the volume serial number and preserves the aliases already defined for the catalog:

 //CONNECT  EXEC PGM=IDCAMS
 //SYSPRINT DD SYSOUT=A
 //SYSIN    DD *
     IMPORT CONNECT ALIAS -
          OBJECTS((SYS1.ICFCAT.SHARED  -
                   DEVICETYPE(3390)    -
                    VOLUMES(339002)))
 /*

If you use EXPORT DISCONNECT, and IMPORT CONNECT, all aliases for the user catalog are deleted from SYSTEMB and must be redefined if needed.