CDC Guide for z/OS

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Operational Considerations

Review the following Adabas CDC operational considerations:

PowerExchange imports Long Alpha (LA) fields with a default length of 1,024 bytes. You can override this default length by editing the data map in the PowerExchange Navigator. Open the Record view of an Adabas file and then open the

Field Properties

dialog box for the LA field. In the

Length

field, you can enter an override value of up to 16,381.

The PowerExchange PCAT utility, DTLCCADW, can read archived Adabas PLOG records from tape data sets, including data sets that have a block size greater than 32,760. The Adabas ECCR can then capture change data from those PLOG records.

If the Adabas File Description Table (FDT) for a source file is password protected in Adabas, the Adabas FDT password is required for a database row test of the Adabas extraction map and for connecting to the Adabas source file during a PowerCenter CDC session. Enter the Adabas FDT password at the following locations:

In the PowerExchange Navigator, enter the password in the

ADABAS File Password

field of the

CAPXRT Advanced Parameters

dialog box for a row test.

In PowerCenter Task Manager, edit the session. On the

Mapping

tab of the

Edit Tasks

dialog box, under

Sources

, click the Adabas source. In the right pane, under

Properties

, enter the FDT password in the

ADABAS Password

attribute.

Starting with Adabas 8.2.2, PowerExchange can capture change data from Adabas spanned records up to their maximum size. The Adabas maximum size depends on the device type.

If you capture change data from Adabas spanned records larger than 32 KB, PowerExchange might allocate a large number of spill files during the extraction of change data, depending on the MEMCACHE parameter setting in the UOWC CAPI_CONNECTION statement of the DBMOVER member. This situation can slow down subsequent extraction processing. To reduce the number of spill files, increase the MEMCACHE parameter value in the UOWC CAPI_CONNECTION statement.

PowerExchange Logger operational issues can cause the Adabas ECCR to enter a wait state, which stalls change data capture until the Logger issues are resolved. After the Logger issues are resolved, the Adabas ECCR can resume change data capture without losing change data.

Monitor the PowerExchange Logger carefully so that change data capture can proceed without interruption.

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CDC Guide for z/OS

CDC Guide for z/OS

Operational Considerations

Operational Considerations