Deciding which VSAM spheres to protect

Ensure that you define your VSAM base clusters and alternate index (AIX®) data sets with SHAREOPTION 1 or SHAREOPTION 2.

You can do this by using the SHAREOPTION parameter of the appropriate access method services (AMS) command, such as the DEFINE CLUSTER command or the ALTER command. If you need to be able to access VSAM spheres from multiple address spaces with update intent, then the spheres must be accessed via VSAM RLS which provides data integrity for multiple updating address spaces and is supported by CICS® VR.

CICS VR VSAM batch logging does not provide logging for data sets accessed in RLS mode.

If you plan to make your ESDSs recoverable, remember that when recovering an ESDS, CICS VR acquires large areas of storage.


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Timestamp icon Last updated: Friday, 29 November 2013


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