"Dawid Kuroczko" <[EMAIL PROTECTED]> wrote: > I am sure the idea is not original, yet still I would like to know how hard > would it be to support local (per table) oldest visible XIDs. > > I mean, when transaction start you need to keep all tuples with xmin >= > oldest_xid in all tables, because who knows what table will that transaction > like to touch.
Per-table oldest XID management sounds good! You mean transactions that touch no tables does not affect vacuums at all, right? If so, the solution can resolve pg_start_backup problem, too. I feel it is enough for standard maintenance commands. Another solution might need for user defined long transactions, though. Regards, --- ITAGAKI Takahiro NTT Open Source Software Center ---------------------------(end of broadcast)--------------------------- TIP 6: explain analyze is your friend
