Online installation of catalog structural changes on an IMS system where managed ACB is not enabled and use the member online change

Find the maintenance procedure for online installation of catalog structural changes on an IMS system where managed ACB is not enabled and use the member online change process.

1. Run the DFS3UACB utility to perform an ACBGEN and to populate the new DFSCD000 instance in the IMS Catalog and in the IMS staging ACBLIB data set.
   In the SYSIN DD, specify: BUILD DBD=(DFSCD000,DFSCX000)

   Note: Building DFSCX000 can be optional but adding it provides consistent timestamps.
2. Define the OLCSTAT data set to enable global online change and pointing to the IMS staging ACBLIB data set.
3. 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 using the following command: /DBR or UPDATE DB … ACCESS(STOP) for DFSCD000 and DFSCX000.
4. Perform the member online change process.
5. 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)