> Correct. The problem actually are aborted transactions. Just because an
> XID is really old doesn't mean it was committed.
Yes, that's the main issue with my idea; XIDs which fell off the CLOG
would become visible even if they'd aborted.
Do we get a bit in the visibility map for a page which has aborted
transaction rows on it?
--
-- Josh Berkus
PostgreSQL Experts Inc.
http://www.pgexperts.com
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