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Status Not under consideration
Workspace Db2 Analytics Accelerator for z/OS
Created by Guest
Created on Jan 9, 2026

RELATED IDEAS

Db2 for z/OS – InSync: make the LogReaderTask commit interval configurable

In replication scenarios with Integrated Synchronization (InSync) (Db2 Analytics Accelerator / Data Gate), LogReaderTask needs to access compression dictionaries to decompress log records. In contention situations, this can result in decompression failures (00C90063) and/or timeouts due to locked resources (00C9008E), especially affecting compressed objects during DDL operations (e.g., ALTER) during business hours. A log reader commit frequency more suited to the load profile helps release locks more regularly and reduce contention windows.
IBM introduced retry logic for temporarily unavailable decompression in the APAR PH27992, reducing the need to reload tables when encountering temporarily unavailable dictionaries. However, the log reader's commit interval is not configurable by the client in InSync, limiting fine-tuning for different operating windows.

Proposed solution: Provide a subsystem parameter (DSNZPARM) in Db2 for z/OS to adjust the "commit interval" of the InSync LogReaderTask.

Needed By Quarter
  • Admin
    Mohamed Elmougi
    Apr 14, 2026

    In V8 IDAA exploits PH64099 for Db2 for z/OS 13 (CDDS support) in the Integrated Synchronization log reader component.

    Expansion dictionaries stored in CDDS to decompress log records can offer various advantages:


    Compressed table spaces referenced in retrieved log records do not need to be opened to access the expansion dictionary for decompression.

    Db2 avoids the need to obtain a DBD lock or claim on the referenced table spaces.

    Db2 no longer requires access to expansion dictionaries from the logs.


    As a consequence of using CDDS commit frequency does no longer offer any advantage since using CDDS will completely eliminate the DBD locks when dealing with compression dictionaries while reading log records.


    Therefore we are not considering additional parameters for commit frequency behaviour.

    Reply

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