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IBM Data and AI Ideas Portal for Customers

This portal is to open public enhancement requests against products and services offered by the IBM Data & AI organization. To view all of your ideas submitted to IBM, create and manage groups of Ideas, or create an idea explicitly set to be either visible by all (public) or visible only to you and IBM (private), use the IBM Unified Ideas Portal (

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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:

    IDR LUW 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