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Status Submitted
Workspace Db2
Components Db2 on-premise
Created by Guest
Created on Mar 26, 2025

RELATED IDEAS

Enhancement for LSN mismatch at startup

Database when activated does basic sanity testing and file structural integrity testing so the time taken to bring up the database is kept to a minimum.

Currently, it cannot possibly check all the objects for sequence number mismatch. This is true with corruption as well. It is not detected until the object is accessed.

We need enhancement on our PRODUCTION databases to check if such a notification at start can be provided without the performance trade off. IBM to provide enhancement and to look at control file corruption and proactive alert for LSN mismatch during DB startup or similar kind of solution.

Needed By Yesterday (Let's go already!)
  • Guest
    Reply
    |     Mar 27, 2025

    Problem Statement:

    This environment has a replicated storage between 2 sites. The database directory is on mount A, the data containers on mount B. A failover was done with Db2 shut down. After the failover the database showed consistency problems in particular after running reorgs. These would try to update the lifeLSN of the object and it was found that the lifeLSN in the object table was higher than the current one. Turns out that something must have gone wrong during the replication of the database directory file system, meaning that the database on DR was started with the log control file which was stale and a day behind on LSNs.


    Enhancement:

    • Recovery mirroring, where we mirror the control files on a secondary file system, which also gets replicated.

    • Control file information / currentLSN to be recorded in first container of each storage group during deactivation and validate during activation

    • Reactive approach where db2dart has additional options for detection of stale LSNs

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