image

Image
Image
Image
Image
Image
image


VSAM Management

VSHAREVSAM Data Manager

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

 



image

 

 

Documentation

Fact Sheet

Available Downloads

VSHARE 3.0B