Make autovacuum sort tables in descending order of xid_age

Folks,

Per a suggestion Christophe made, please find attached a patch to
$Subject:

Apart from carefully fudging with pg_resetwal, and short of running in
production for a few weeks, what would be some good ways to test this?

Best,
David.
-- 
David Fetter <david(at)fetter(dot)org> http://fetter.org/
Phone: +1 415 235 3778

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