| From: | Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us> |
|---|---|
| To: | "Mikheev, Vadim" <vmikheev(at)SECTORBASE(dot)COM> |
| Cc: | "'Hiroshi Inoue'" <Inoue(at)tpf(dot)co(dot)jp>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Ryan Bradetich <ryan_bradetich(at)hp(dot)com>, pgsql-sql(at)postgresql(dot)org |
| Subject: | Re: Use of index in 7.0 vs 6.5 |
| Date: | 2000-05-25 15:11:23 |
| Message-ID: | 200005251511.LAA21178@candle.pha.pa.us |
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| Thread: | |
| Lists: | pgsql-sql |
[ Charset ISO-8859-1 unsupported, converting... ]
> > For example we could count up distinct values for the first
> > column of an index by scanning its index relation.
>
> Oracle has index keys distribution page... And we have near empty
> meta-page for each index AM... And backend reads this page for
> each insert...
That certainly would make sense. We have hesitated to gather more
statistics because of the time involved. Fuller statistics on just the
indexed columns could be a big win and be done fairly quickly because
the rows are already sorted in the index.
--
Bruce Momjian | http://www.op.net/~candle
pgman(at)candle(dot)pha(dot)pa(dot)us | (610) 853-3000
+ If your life is a hard drive, | 830 Blythe Avenue
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