From: | "Greg Sabino Mullane" <greg(at)turnstep(dot)com> |
---|---|
To: | mailings(at)oopsware(dot)de |
Cc: | pgsql-hackers(at)postgresql(dot)org |
Subject: | Re: Prepared transactions vs novice DBAs, again |
Date: | 2009-05-05 15:56:18 |
Message-ID: | d7ca856520a34396a43a36c574e7929b@biglumber.com |
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Lists: | pgsql-hackers |
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> 1 seconds seems a very low default for me. I can imagine that most
> distributed transactions are taking longer than this to complete.
One second means it is set by default to catch *all* prepared
transactions. It's simply checking how long the transaction has
been open via:
SELECT database, ROUND(EXTRACT(epoch FROM now()-prepared)), prepared
FROM pg_prepared_xacts ORDER BY prepared ASC;
If you *are* using prepared transactions (which most people are not),
you would want to set a specific number for your environment -
and certainly more than 1 second (perhaps 5 minutes?) At that point,
the check changes from "has anybody mistakenly created a prepared
transaction" to "has one of our prepared transactions been open
too long?"
- --
Greg Sabino Mullane greg(at)turnstep(dot)com
End Point Corporation
PGP Key: 0x14964AC8 200905051154
http://biglumber.com/x/web?pk=2529DF6AB8F79407E94445B4BC9B906714964AC8
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