Re: [GENERAL] Fast join
От | Bruce Momjian |
---|---|
Тема | Re: [GENERAL] Fast join |
Дата | |
Msg-id | 199906291331.JAA20566@candle.pha.pa.us обсуждение исходный текст |
Ответ на | Fast join (Leon <leon@udmnet.ru>) |
Список | pgsql-general |
> Hello all! > > I assume this is a developer's list, isn't it? Because the > address hackers-request@postgreSQL.org mentioned in PostgreSQL FAQ > doesn't work. > > Ok. Let me begin with the beginning. We are a group of developers > of an free accounting system here in Russia. We want to use Postgres > as our database server. It is cool, but we encountered a problem > during preliminary tests, a problem concerning joins. The problem > is that joins are too slow. Consider that sequence of commands > given at the command prompt of psql (strange duplicates of NOTICEs are > removed): Are you using 6.5? If not, upgrade. The optimizer is much smarter in 6.5. Also, if a join does most of the table, it is faster do not use indexes, and just sort on the backend. -- Bruce Momjian | http://www.op.net/~candle maillist@candle.pha.pa.us | (610) 853-3000 + If your life is a hard drive, | 830 Blythe Avenue + Christ can be your backup. | Drexel Hill, Pennsylvania 19026
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