| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | "Kevin Grittner" <Kevin(dot)Grittner(at)wicourts(dot)gov> |
| Cc: | "Simon Riggs" <simon(at)2ndQuadrant(dot)com>, "Alvaro Herrera" <alvherre(at)commandprompt(dot)com>, "decibel" <decibel(at)decibel(dot)org>, "Heikki Linnakangas" <heikki(dot)linnakangas(at)enterprisedb(dot)com>, "Itagaki Takahiro" <itagaki(dot)takahiro(at)oss(dot)ntt(dot)co(dot)jp>, "pgsql-hackers" <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: FSM search modes |
| Date: | 2009-10-01 22:49:45 |
| Message-ID: | 6080.1254437385@sss.pgh.pa.us |
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"Kevin Grittner" <Kevin(dot)Grittner(at)wicourts(dot)gov> writes:
> Fuzzy thinking there -- if it's the last quarter of the *free* pages,
> the suggested probabilities should be fine. (Somehow I got to
> thinking, for a moment, that it would be the last quarter of the
> relation's overall pages....)
It's going to be the latter --- we do not know, and are *not* going to
invest the cycles to find out, how many pages have a useful amount of
free space. Even finding out the relation physical length might be
more cycles than we want to spend here ...
regards, tom lane
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