CDC Guide for z/OS

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PowerExchange Condense Overview

PowerExchange Condense captures change data from PowerExchange Logger for z/OS log files and writes that data to condense files. You can make the change data in the condense files available for extraction processing at user-defined intervals.

PowerExchange Condense can perform full or partial condense processing. You specify the type of condense processing when you create a capture registration in the PowerExchange Navigator by setting the

Condense

option to one of the following values:

Full: Full condense processing. During a full condense cycle, PowerExchange Condense records only the latest image of the change data to keyed VSAM condense data sets. If multiple changes are made to the same record, later changes supersede earlier changes, leaving only the latest change. Use full condense processing only for tables or data maps that specify key columns. You cannot use full condense processing for Adabas and IDMS log-based CDC. Full condense processing does not maintain transactional integrity, but it can decrease the amount of change records that are processed and extracted.
If a change is recorded for a row in a full condense file and then a condense file switch occurs while additional changes for that row are pending, you might get a change record for the row in both condense files. This situation depends on the file switch parameters and the level of change activity in your environment.
Part: Partial condense processing. During a partial condense cycle, PowerExchange Condense writes successfully completed changes to sequential condense files, in chronological order based on end time. PowerExchange Condense does not eliminate any of the changes. This condense type maintains transactional integrity.
Instead of using PowerExchange Condense partial condense processing, you can use the PowerExchange Logger for Linux, UNIX, or Windows to offload condense processing from the z/OS system. For more information about remote logging, see the
PowerExchange CDC Guide for Linux, UNIX, and Windows
.

Also, you can run a PowerExchange Condense job in batch mode or continuous mode.

CDC sessions extract change data from the condense files in batch extraction mode.

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CDC Guide for z/OS

CDC Guide for z/OS

PowerExchange Condense Overview

PowerExchange Condense Overview