CDC Guide for z/OS

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Restoring VSAM Data Sets When Using the Batch VSAM ECCR

The batch VSAM ECCR captures changes from VSAM batch jobs and passes the changes to the PowerExchange Logger to be recorded. If the VSAM batch job step terminates abnormally, PowerExchange aborts any open units of work in the PowerExchange Logger for that job step. When you extract change data, PowerExchange provides only successfully committed units of work and skips aborted units of work.

If the batch job closes the VSAM data set registered for capture before it terminates abnormally, the PowerExchange Logger unit of work containing the changes for that VSAM data set is successfully committed. When you extract changes for this VSAM data set, PowerExchange provides the changes from the failed batch job because the UOW was successful even though the batch job ultimately failed.

If you restart batch VSAM processing from the point of failure rather than restoring the data set and restarting the batch job from the beginning, you must change the default PowerExchange operation to capture change data properly. To change the default PowerExchange processing, add the following DD statement in each batch VSAM job where you restart processing from the point of failure:

//EDMCMUOW DD DUMMY

When you use the EDMCMUOW DD statement and the batch VSAM job step terminates abnormally, PowerExchange commits all open units of work (UOWs) generated by the batch VSAM job. Consider the following points before using the EDMCMUOW DD statement:

Depending upon the failure circumstances, the batch VSAM ECCR may not get control to commit the open units of work. If so, any uncommitted units of work from the failed VSAM batch job are left in IN-DOUBT status. You must use the PowerExchange Logger RESOLVE_INDOUBT command to commit these uncommitted units of work.

Do not use EDMCMUOW if you have specified full condense in the capture registration for a VSAM data set.

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CDC Guide for z/OS

CDC Guide for z/OS

Restoring VSAM Data Sets When Using the Batch VSAM ECCR

Restoring VSAM Data Sets When Using the Batch VSAM ECCR