Re: Performance problem, what to do?
От | Archibald Zimonyi |
---|---|
Тема | Re: Performance problem, what to do? |
Дата | |
Msg-id | Pine.LNX.4.21.0112181648130.8378-200000@valdez.netg.se обсуждение исходный текст |
Ответ на | Re: Performance problem, what to do? (Tom Lane <tgl@sss.pgh.pa.us>) |
Список | pgsql-sql |
> Archibald Zimonyi <archie@netg.se> writes: > > On demand, I'll post the database structure as well as the SQL query which > > creates the slow respons. I'll add them as attachments (do they come at > > all?). > > You're forcing the join order by using explicit JOIN syntax. > Rearranging the join order might yield a better plan. See > http://www.postgresql.org/users-lounge/docs/7.1/postgres/explicit-joins.html > I know I am, but if you look at the plan (which I will again add as an attachment) you see that the plan looks pretty good, in fact way better then the original plan did. I don't know how much time each "unit" takes, but a normal select (SELECT * FROM <table>), which might yield a plan of 0..22.2 "units", takes no time at all. This plan is at most up at 200, which I don't think is costly considering what it does. Archie
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