z/OS DFSMStvs Planning and Operating Guide
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Transaction processing and transactional recovery

z/OS DFSMStvs Planning and Operating Guide
SC23-6877-00

Different applications often need to share VSAM data sets. Sometimes the applications need only to read the data set. Sometimes an application needs to update a data set while other applications are reading it. The most complex case of sharing a VSAM data set is when multiple applications need to update the data set and all require complete data integrity.

Consider these examples:
  • Transactions initiated by different applications might need to access the same VSAM data set at the same time.
  • A transaction might need to access a VSAM data set at the same time that a batch job is using the data set.

Transaction processing provides functions that coordinate work flow and the processing of individual tasks for the same data sets. VSAM record-level sharing and DFSMStvs provide key functions that enable multiple batch update jobs to run concurrently with CICS® access to the same data sets, while maintaining integrity and recoverability.

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