Re: Automatic free space map filling

Tom Lane wrote:
> Peter Eisentraut <peter_e(at)gmx(dot)net> writes:
> > I'm not sure if I made myself clear. The idea is that you fill the free-space
> > map early with opportunitistic entries in the hope that most updates and
> > deletes go through "soon". That is, these entries will be invalid for a
> > short time but hopefully by the time another write looks at them, the entries
> > will have become valid. That way you don't actually have to run vacuum on
> > these deleted rows.
>
> How does an optimistic FSM entry avoid the need to run vacuum? All that
> will happen is that some backend will visit the page and not find usable
> free space.

Because the index isn't removed, right? That index thing is what
usually kills us.

--
Bruce Momjian http://candle.pha.pa.us
SRA OSS, Inc. http://www.sraoss.com

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