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VSAM Management

VSHARE VSAM Data Manager

Platform: z/OS

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
  • VSHARE communicates using VTAM and z/OS Cross Memory Services
    • VTAM can be used when the batch job and the CICS regions reside on the same or different CPUs.
    • Cross Memory Services provides a performance boost but the batch job and the CICS region must be in the same z/OS system.
  • z/OS 2.1 Compatible


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Documentation

Data Sheet

Available Downloads

VSHARE 4.0A