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Status Future consideration
Workspace Db2
Components Replication
Created by Guest
Created on Jul 26, 2024

TS016588496: MAX_LOG setting for User vs System Activities, 2003 (MQRC_BACKED_OUT)

As documented in PMR TS016588496, a QRep configuration may fail to apply a transaction to a target system due to exceeding the MQ Log configuration. At the DB layer, the configuration setting MAX_LOG manages how large a transaction may be in terms of bytes for the log (update/rollback) for a single transaction.

This idea is to allow for a toggle so Replication doesn't replicate system activities, like Reorg/Index Builds/etc, but the MAX_LOG setting limits the size of the reorg/index build when it doesn't need to, since there is no user data to replicate from these activities. Thus having to adjust MAX_LOG for reorgs/index builds/etc opens a window where the target system may not be syncable, and there is no recovery and/or easy to determine what wasn't replicated.

Since the replication error may be unrecoverable, the only remediation is to rebuild the target system which may take weeks/months - is this really a reasonable outcome due to the behavior of how MAX_LOG is implemented? Or there being no toggle to address how logging is manager for user vs system activities?

Please consider providing a toggle that allows for management of User vs System transactions regarding log allocation that is configurable online and doesn't require a recycle of the DB.

Share if additional details are needed.

Needed By Week