Hello.
I'm using 8.3.0 and I see that autovacuum processes in
pg_stat_activity have xact_start.
As far as I know, since at least 8.2.x the VACUUM does not start a new
transaction.
If that statement is correct, the xact_start column in
pg_stat_activity should be NULL...
Why does it matter? Monitoring. It's good to know the age of oldest
running transaction,
and autovacuuming is well, adding noise.
Regards,
Dawid
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