| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Robert Haas <robertmhaas(at)gmail(dot)com> |
| Cc: | Bruce Momjian <bruce(at)momjian(dot)us>, Mladen Gogala <mladen(dot)gogala(at)vmsinfo(dot)com>, Greg Smith <greg(at)2ndquadrant(dot)com>, Andrew Dunstan <andrew(at)dunslane(dot)net>, "david(at)lang(dot)hm" <david(at)lang(dot)hm>, Craig Ringer <craig(at)postnewspapers(dot)com(dot)au>, Vitalii Tymchyshyn <tivv00(at)gmail(dot)com>, "pgsql-performance(at)postgresql(dot)org" <pgsql-performance(at)postgresql(dot)org> |
| Subject: | Re: [HACKERS] Slow count(*) again... |
| Date: | 2011-02-03 17:46:48 |
| Message-ID: | 25146.1296755208@sss.pgh.pa.us |
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| Lists: | pgsql-hackers pgsql-performance |
Robert Haas <robertmhaas(at)gmail(dot)com> writes:
> I don't, however, agree with his contention that this is easy to
> implement. It would be easy to implement something that sucked. It
> would be hard to implement something that actually helped in the cases
> where the existing settings aren't already sufficient.
Exactly. A hint system that actually did more good than harm would be a
very nontrivial project. IMO such effort is better spent on making the
optimizer smarter.
regards, tom lane
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