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VSAM Management

VSHARE

VSAM Data Manager

Platform: z/VSE
VSHARE allows multiple programs to update the same VSAM file simultaneously by giving batch jobs the ability to update files within CICS.

VSHARE consists of three basic components:


  • The first component executes in the batch programs area—it intercepts the I/O requests and ships them to the second component of VSHARE residing in CICS


  • The second component of VSHARE resides in the CICS region owning the VSAM files—it performs all of the VSAM I/O on behalf of the batch job


  • The third component of VSHARE also resides in the CICS region—it comprises a series of online programs providing the following functions:
  • Define CICS regions to use VSHARE
  • Define jobs eligible to use VSHARE
  • Monitor active jobs currently using VSHARE
  • Suspend a job that is currently active
  • Restart a job previously suspended
  • Cancel a job
  • Reduce the rate of I/O requests being sent to CICS in the event of heavy online activity
  • Review prior executions of batch jobs


The first and second components communicate through VTAM or through z/VSE Cross Memory Services


  • VTAM can be used when the batch job and the CICS region reside either on the same CPU or on different CPUs



  • Cross Memory Services provide a performance boost but the batch job and the CICS region must be in the same z/VSE system

Data Sheet

VSHARE for zVSE
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