| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us> |
| Cc: | "P(dot)J(dot) \"Josh\" Rovero" <rovero(at)sonalysts(dot)com>, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: TOAST performance (was Re: [GENERAL] Delete Performance) |
| Date: | 2001-11-22 01:40:46 |
| Message-ID: | 27152.1006393246@sss.pgh.pa.us |
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| Lists: | pgsql-general pgsql-hackers |
Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us> writes:
> I was thinking of just throwing the inactive page number into WAL. Much
> smaller than the entire page image. You don't touch the page. Does
> that help?
I don't think so. Somehow you have to tell the other backends that that
page is dead; merely recording it in WAL doesn't do that.
More to the point, you can't recycle (overwrite) that page until you've
checkpointed or WAL-logged the replacement page; so you still end up
with disk I/O for the replacement.
regards, tom lane
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