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terminate rollback

When  database is rollback a long transaction , it may take a long time. User don't want to wait for rollback to finish.

One scenario is that user has made a large change on a table that is not that important table so they are willing to drop it (or they can recreate the data).  So they would rather Db2 make the affected table not accessible and not perform all the compensation on that table.

  • Ling Qin
  • Aug 9 2019
  • Needs review
Why is it useful?
Who would benefit from this IDEA?
How should it work?

the transaction being rolled back holds various resources to protect the changes that are still to be backed out.   Terminating the rollback means not performing the backing out and release these resources.  Then other applications will see inconsistent data.   So there will be consequences for such termination.  User will have to at least agree that they are willing to live with such consequences on all (or at least some) of the affected data.

We should give user a choice. If user can accept data lost, we can terminate the rollback quickly and make database usable.

Idea Priority Medium
Priority Justification
Customer Name CMB
Submitting Organization
Submitter Tags
  • Attach files
  • Matthew Emmerton commented
    7 Oct, 2019 09:28pm

    What is the desired functionality here?

    1) Do you want the ability to mark a table as "not recoverable", so that when the active session acting on that table is interrupted, the rollback will skip undoing changes to that table, thus making rollback faster?
    This would require this specific object to be dropped (and possibly recreated). Other objects modified in that transaction would have those operations rolled back as per usual..

    2) Do you want the ability to interrupt a rollback, and have Db2 automatically mark all affected objects in the transaction as "not recoverable", so that the rollback will skip undoing changes to all objects, thus making rollback faster?
    This would require that all affected objects be dropped (and possibly recreated).

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