Rodrigo De León wrote: > On 10/1/07, Abandoned <besturk@xxxxxxxxx> wrote: >> Hi.. >> I have a id list and id list have 2 million dinamic elements.. >> I want to select what id have point.. >> I try: >> >> SELECT id, point FROM table WHERE id in (IDLIST) >> >> This is working but too slowly and i need to performance.. >> >> I'm sorry my bad english. >> King regards.. > > DDL please... I guess the OP's problem is with the time it takes to push a query containing 2 million ID's through the SQL parser. A few things that may help: - See if you can find any uninterrupted ranges of values in your ID's and combine them into separate where clauses (ie. where id between x and y). This won't help you much for ranges where y = x+1, but it does help if (for example) y = x+10... - Try if it helps COPY-ing your ID's into a temp table and join your table with that instead of using a huge IN list. - If you're still using PG 7.4, try a PG 8. There have been significant performance improvements with IN lists in queries in the 8-series. Regards, -- Alban Hertroys a.hertroys@xxxxxxxxxxxxxxxxx magproductions b.v. T: ++31(0)534346874 F: ++31(0)534346876 M: I: www.magproductions.nl A: Postbus 416 7500 AK Enschede // Integrate Your World // ---------------------------(end of broadcast)--------------------------- TIP 2: Don't 'kill -9' the postmaster
