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IDS Forum

Re: Infamous Long Transaction problem

Posted By: DAVE GRIFFEN
Date: Monday, 12 May 2008, at 3:54 p.m.

In Response To: Infamous Long Transaction problem (WILL LANDSTROM)

Will,
Once you hit a long transaction abort, my suggestion is to wait it out. Rollbacks routinely take 15-25 times the duration of the initial modifications. Efforts to speed the process are almost always futile and will only delay the process. No matter what you do, Informix will ultimately complete the rollback. The only way to stop the rollback from happening would be for down systems to hack it, but this will leave your data inconsistent. Therefore, they really don't like to do it.

Here are my recommendations for minimizing the impact of future Long Transaction Aborts.

DYNAMIC_LOGS 2
LTXHWM 50 or lower
LTXEHWM 100

First, Dynamic_logs are essential to ensuring database integrity in these situations. Make sure they are enabled.
Second, I view having 1 thread rollback unexpectedly as an annoyance. Having all data modifications in your instance stopped is when everyone notices and is magnitudes worse. Therefore, I suggest setting high watermarks aimed at preventing the later. Since avoiding LTXEHWM is the aim, set it to it's maximum 100. In order to have LTA's complete prior to hitting the LTXEHWM, they should to be triggered at or before 50% so they have sufficient space to rollback. If you have other threads using significant log space, you may still hit the exclusive mark. Hopefully the duration in exclusive mode will be limited.

Hope this helps,
Dave Griffen

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