On Tue, Feb 08, 2005 at 01:55:47PM +0200, Hannu Krosing wrote:
> So I guess that making it commit and open new transaction at a regular
> interval (like each minute) during vacuuming single table would not
> alter its visible behaviour. That would solve my problem of long-running
> vacuums on large tables polluting unrelated small but heavily updated
> tables with dead tuples.
Interesting. The problem is that a long running VACUUM on a single
table will keep in PGPROC a TransactionId that will last very long,
which will "pollute" every concurrent Snapshot; so smaller tables can't
be cleaned up because the tuples are visible for the transaction running
the vacuum -- except that that transaction cannot possibly want to look
at them.
--
Alvaro Herrera (<alvherre[@]dcc.uchile.cl>)
"La tristeza es un muro entre dos jardines" (Khalil Gibran)
