Use the VTMM transaction to switch the CICS® VT migration status of a specific file. The format of the transaction is:
VTMM file-name ACT or
VTMM file-name INACT
The migration status of the file established by the VTMM transaction persists until any of the following events:
You must specify a single file-name with the VTMM transaction.
The DST is explained in full in Adding a new data set to the CICS VT data set table .