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Status Not under consideration
Created by Guest
Created on Sep 14, 2017

CDC for DB2 LUW recovering from database conditional locks

Recently one of the customers hit a conditional lock when reading from database log (with compression enabled) using DB2 read log api. Soon after this subscription failed without an ability to restart automatically.

The conditional lock failure is a result of some operation running concurrently that is getting a Z lock. For example, when IUD is followed by a specific operation like LOAD, REORG or TRUNCATE. In this case when CDC calls db2 readlogapi, it gets this lock error because those operation(s) would not have been committed yet (holding z lock on the table).

DB2 says that read log api can't read the table compression dictionary until the concurrent insert is committed hence returns the lock error to CDC.

So, this request is for enhancing the capture engine to:
1. Add retry mechanism for transient lock errors like this one.
or
2. Add conditional lock errors as recoverable so that when subscription is configured as persistent it restarts automatically.

  • Guest
    May 17, 2021

    [IBM Update]

    Hi,

    Thank you for filing this requirement and for your interest in keeping CDC a vital and successful technology. We depend on your continued interest and ideas to help ensure our products keep pace with market needs and industry standards.

    Although we do agree that your request is valid, after monitoring your request for more customer demand over the last few years and applying other relevant evaluation criteria, unfortunately we won't be able to accept your request at this time. However, if there is still an important business need, we encourage you to file a new idea accompanied with any additional information that could help us prioritize the requirement in the future.