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Ignore log records for a dedicated subscription in IGNORETRANS

In very rare cases Db2 cannot provide log records for Q Capture, e.g. in case of a version mismatch, a compression dictionary error, etc. Removing the subscription and reloading the target is a practical approach. But in some situations (e.g., non condensed target table history, for example for regulatory use cases) reloading the target is the 2nd best option.

Today we have the following options:

  1. remove subscription from setup and restart Capture

  2. use IGNORETRANS to skip the transaction

With option 1 we lose a lot of changes for a table, as the subscription can only be brought back with a SIGNAL with a potentially big pause (depending on how long it takes to diagnose, remove the sub, restart Capture, add the SIGNAL).

With option 2 a lot of subscriptions can be effected, and it is really hard to diagnose which subscriptions (especially those without a problem) suffer from data loss due to the skipping of a complete transaction.

The requested enhancement is to enrich the IGNORETRANS option with a filter to be able to react specifically in case of a problem as described above.

  • Avatar32.5fb70cce7410889e661286fd7f1897de Guest
  • Sep 9 2020
  • Future consideration
Replication: Q-Replication & Availability / Q Replication for Z
Who would benefit from this IDEA? Replication admin, business user
How should it work?

The requested enhancement is to

  • enrich the IGNORETRANS option with a subscription name / sub_id to only skip log records for a dedicated sub

  • optionally enrich IGNORETRANS to specify how many log records to skip for the subscription

  • add some metadata to the Capture log (or to a "bad" file) to indicate which log record / which row was skipped if possible, to open up for options to bring back the data with alternative means

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Idea Priority High
Priority Justification see description
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