| From: | "Mikheev, Vadim" <vmikheev(at)SECTORBASE(dot)COM> |
|---|---|
| To: | "'Tom Lane'" <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us> |
| Cc: | "'Hiroshi Inoue'" <Inoue(at)tpf(dot)co(dot)jp>, 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 17:17:41 |
| Message-ID: | 8F4C99C66D04D4118F580090272A7A23018C05@SECTORBASE1 |
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| Lists: | pgsql-sql |
> Yeah, a scan over just the index itself would be a perfect way to
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
I believe that Oracle updates index statistic on-fly...
Meta-page is always in cache for inserts, so there will be no
additional reads.
> gather stats. The normal objection to it (can't tell whether entries
> correspond to currently-valid tuples) doesn't apply, because we don't
> really care whether the stats are perfectly accurate.
Vadim
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