When an application uses DFSMStvs to process a transaction, DFSMStvs and RLS perform these tasks:

• Resource locking
• Logging the updates to records in recoverable data sets and logging the image of records before they are updated. This allows the updates to be backed out, if necessary. Optionally, DFSMStvs also records the images of records after they are updated so that forward recovery programs can use the records.