CDC Guide for z/OS

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IDMS Log-Based ECCR Operational Considerations

The IDMS log-based ECCR works with other PowerExchange components such as the PowerExchange Logger and the PowerExchange Agent to capture change data.

Before implementing the ECCR, review the following information about ECCR relationships and operational issues:

The ECCR must log all changes to a single PowerExchange Logger.

The ECCR must run on the same z/OS system as the PowerExchange Logger and PowerExchange Agent.

Operational issues in the PowerExchange Logger can cause the ECCR to enter a wait state. While in a wait state, the ECCR cannot capture and record additional changes. After you resolve the PowerExchange Logger issues, the ECCR can resume the capture and recording of change data without any data loss.

Carefully monitor the PowerExchange Logger to ensure that change data capture proceeds without interruption.

PowerExchange can capture IDMS change data that has been compressed with the CA-IDMS Presspack package or IDMSCOMP database procedure.

If you use IDMSCOMP compression and IDMSDCOM decompression, you do not need to take any special configuration action for CDC.

If you use Presspack compression, you must modify the IDMS ECCR JCL so that the ECCR can use Presspack decompression during change capture. Complete the following configuration steps:

If the ECCR does not run APF-authorized, specify the standard IDMS runtime libraries, including the data characteristic tables (DCTs) and a valid DMCL, in the STEPLIB concatenation of the ECCR JCL.

If the ECCR runs APF-authorized, create copies of the IDMS runtime libraries and APF-authorize the copies. Then specify these copies in the STEPLIB concatenation. If you add or modify DCTs for records that are registered for change capture later, you must manually copy the tables to these duplicate libraries.

Do not APF-authorize the original IDMS libraries. If you do, some IDMS utilities might fail with a S0C4.

Unless you use the default DMCL named "IDMSDMCL," add a SYSIDMS DD input card and specify the name of the DMCL that you use in the input stream.

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CDC Guide for z/OS

CDC Guide for z/OS

IDMS Log-Based ECCR Operational Considerations

IDMS Log-Based ECCR Operational Considerations