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Status Delivered
Workspace Replication: Change Data Capture
Created by Guest
Created on Oct 15, 2019

RELATED IDEAS

PostgreSQL wal file management

CDC is preventing the PosgreSQL database source to delete its wals files. From what I see, CDC uses logical replication slots but it never seems to update the value of LSN (Log Sequence Number) : it always points to the wal that was current when the agent was created.

CDC must be able to manage itself the replication slot's LSN position. CDC DB2 z/OS does it natively so with PostgreSQL, it must do the same thing. With a database that produces 500 MB of wal files a day, it is not possible to schedule regular stop subscription/dmsetpostgresqlflushlsn/start subscriptions jobs only because CDC does not do it natively

Needed by Date Oct 25, 2019
  • Guest
    Reply
    |     Mar 3, 2020

    CDC has been enhanced to provide better capability for WAL handling as per:

    https://www.ibm.com/support/pages/node/1110477

    IDR LUW 11.4.0.2-5528 for PostgreSQL

    • dmsetpostgresqlflushlsn command line utility has been enhanced to flush lsn and release older unnecessary WAL files across all subscriptions without requiring to stop any subscription

    • dmsetpostgresqlflushlsn command line utility has an improved performance

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