Re: found xmin from before relfrozenxid on pg_catalog.pg_authid

On Wed, Mar 21, 2018 at 1:38 PM, Jeremy Finzel <finzelj@gmail.com> wrote:
> A server restart and upgrade to 9.5.12 (at the same time), as expected, made
> the issue go away.  Still doesn't give us any answers as to what happened or
> if it would happen again!  Thanks for the feeback.

You may still want to use amcheck to look for problems. The version on
Github works with 9.5, and there are Redhat and Debian pgdg packages.
See:

https://github.com/petergeoghegan/amcheck

The "heapallindexed" option will be of particular interest to you -
that option verifies that the table has matching rows for a target
index (in addition to testing the structure of a target B-Tree index
itself). This is probably the best general test for corruption that is
available. There is a fair chance that this will reveal new
information.

--
Peter Geoghegan