Online installation of catalog structural changes on an IMS system where managed ACB is enabled

Find the maintenance procedure for online installation of catalog structural changes on an IMS system where managed ACB is enabled.

1. Run the DFS3UACB utility to perform an ACBGEN and to populate the new DFSCD000 instance and related objects in the IMS Catalog and in the IMS directory staging data set.
   • If all IMS systems are enabled for managed ACB, then in the SYSIN DD, specify: BUILD DBD=(DFSCD000,DFSCX000)
     Note: Building DFSCX000 can be optional but adding it provides consistent timestamps.
   • If all IMS systems are not enabled for managed ACB, but some are, then in the SYSINP DD, specify: MANAGEDACBS=(STAGE,CATRSCS)
2. Quiesce or take the catalog resources offline.
   1. Quiesce all activity against the IMS catalog databases by issuing the following command:

      UPDATE DB NAME(DFSCD000,DFSCX000) START(QUIESCE) OPTION(HOLDALL)

   2. Take the databases offline by issuing the following command for DFSCD000 and DFSCX000: /DBR or UPDATE DB … ACCESS(STOP)
3. Issue the following IMPORT command to implement the change: IMPORT DEFN SOURCE(CATALOG) NAME(DFSC*)
   Note: If you have your own non-DFSC catalog-related resources that reference the catalog DFSCD000 resource, use the following command to first import the catalog resources:

   IMPORT DEFN SOURCE(CATALOG) NAME(DFSC*) OPTION(NOCHECK)

4. Start the catalog resources.
   • If the IMS system was taken offline:
     1. Start the DFSCD000 and DFSCX000 databases by using the following command: /START DB or UPDATE DB
     2. Start all the catalog partitions with the OPEN option by using the following command: /START DB or UPDATE DB

        For example, /STA DB DFSCD01 OPEN and /STA DB DFSCX01 OPEN.

   • If the resources were quiesced:

     Resume access to the IMS catalog databases with the following command: UPDATE DB NAME(DFSCD000,DFSCX000) STOP(QUIESCE)

5. If you have your own non-DFSC catalog-related resources that reference catalog DFSCD000 resource, use the following command to import them: IMPORT DEFN SOURCE(CATALOG) NAME(non-DFSC_resource_name)