> 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.

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