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Status Delivered
Created by Guest
Created on Oct 15, 2019

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
    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