| From: | Vadim Mikheev <vadim(at)krs(dot)ru> |
|---|---|
| To: | Bruce Momjian <maillist(at)candle(dot)pha(dot)pa(dot)us> |
| Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Hiroshi Inoue <Inoue(at)tpf(dot)co(dot)jp>, pgsql-hackers(at)postgreSQL(dot)org |
| Subject: | Re: [HACKERS] mdnblocks is an amazing time sink in huge relations |
| Date: | 1999-10-20 04:01:15 |
| Message-ID: | 380D3E8B.DA5966C6@krs.ru |
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| Lists: | pgsql-hackers |
Bruce Momjian wrote:
>
> > I agreed that there is no way to get accurate estimation for
> > # of rows to be seen by a query...
> > Well, let's keep up-to-date # of rows present in relation:
> > in any case a query will have to read them and this is what
> > we need to estimate cost of simple scans, as for costs of
> > joins - now way, currently(?) -:(
> >
> > But please remember that there is another SCC goal -
> > faster catalog access...
>
> I want to index access more cache entries on cache miss for 7.0.
Good. But in any case we'll gain faster access from _shared_ cache.
Vadim
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