From: | Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us> |
---|---|
To: | Hiroshi Inoue <Inoue(at)tpf(dot)co(dot)jp> |
Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Dave Cramer <Dave(at)micro-automation(dot)net>, Neil Conway <neilc(at)samurai(dot)com>, PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: cursors outside transactions |
Date: | 2003-03-20 03:13:14 |
Message-ID: | 200303200313.h2K3DEf02295@candle.pha.pa.us |
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Lists: | pgsql-hackers |
Hiroshi Inoue wrote:
> Bruce Momjian wrote:
> >
> > Hiroshi Inoue wrote:
> > > > I don't see how you can class out of memory in the same likelyhood as
> > > > out of disk --- sure they are both real possible failures, but clearly
> > > > the latter is more rare and giving folks backing store for large result
> > > > sets is a big win in my book.
> > >
> > > Other than the out of disk/memory problem, there 's
> > > another problem. What I expect of cursors is the
> > > constant response time while handling them.
> >
> > Cursors outside transactions either need materialization or long-lived
> > locks
>
>
> AccessShare table locks are only needed.
> What is wrong with it ?
But that is going to block VACUUM, right? Aren't we better
materializing and letting vacuum run? I am not sure --- I am just
asking.
--
Bruce Momjian | http://candle.pha.pa.us
pgman(at)candle(dot)pha(dot)pa(dot)us | (610) 359-1001
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