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CICS-VSAM tuning options

We have a PLI-CICS-VSAM-based system whose performance is degrading due to increase in VSAM file sizes. What are...

the tuning options we can think of for a CICS-VSAM system? Will making a few VSAM files as SDTs help? It's difficult to say without more info. However, I suspect that this slow down could be caused either by the number of CI/CA splits that have occurred (essentially, a file fragmentation/size problem) or that the access pattern to the file requires more buffers than you have available. Putting the file in a CMDT will speed things up but I'd suggest looking at the VSAM stats first.

Robert Harris
CICS Technical Strategist -- CICS expert at Search390.com

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This was last published in August 2003

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