CICS VSAM Transparency for z/OS, Version 1.2


Implications for batch programs

Batch programs handle updates to DB2® and VSAM resources differently to CICS® application programs. For example, there is no logging of VSAM updates in a batch program.

To deal with this, there are two different processing methods for batch programs in CICS VT. The default method processes all SQL calls in the same DB2 thread. The second method, which is enabled at an individual batch program level, uses MVS™ subtasking to allow you to have multiple, independent threads to DB2.

CICS VT subtasking incurs a performance overhead and should only be used when necessary. The next sections explain CICS VT subtasking and define when it should be used.





Last updated: May 25, 2012 20:43:54