Re: BUG #16614: Stale temporary objects makes vacuum ineffective when 1 million transactions remain

Michael Paquier <michael@paquier.xyz> writes:
> Yeah.  11 and newer versions have been made even more aggressive with
> the cleanup of orphaned tables in autovacuum, particularly the case
> where a backend reuses the ID of a past session that crashed, leaving
> behind some temporary tables.  Perhaps that was the case here?

Off-list, the OP indicated that the problem is actually of the other
category, ie the problematic tables belong to extremely long-lived
sessions that are managed by a connection pooler.  I don't quite
understand why the pooler isn't issuing DISCARD ALL between clients,
but anyway it seems that PG is operating as designed here.

            regards, tom lane