Damn slow query
От | Magnus Naeslund(f) |
---|---|
Тема | Damn slow query |
Дата | |
Msg-id | 03a701c26fdb$9ec50c30$f80c0a0a@mnd обсуждение исходный текст |
Ответы |
Re: Damn slow query
|
Список | pgsql-hackers |
Hello, i've got this query that's really slow... Figure this: testdb=> select now() ; select gid from bs where gid not in ( select x from z2test ); select now(); now -------------------------------2002-10-09 22:37:21.234627+02 (1 row) gid ----------<lotsa rows> (524 rows) now -------------------------------2002-10-09 23:20:53.227844+02 (1 row) That's 45 minutes i don't wanna spend in there... I got indexes: testdb=> \d bs_gid_idx Index "bs_gid_idx"Column | Type --------+-----------------------gid | character varying(16)online | smallint btree testdb=> \d z2test_x_idx; Index "z2test_x_idx"Column | Type --------+-----------------------x | character varying(16) btree Rowcounts are: testdb=> select count(*) from bs ; select count(*) from z2test ;count -------25376 (1 row) count -------19329 (1 row) The bs table have many other columns besides the gid one, the z2test table only has the x column. How can i speed this query up? It never scans by the indexes. I know it's a lot of iterations anyway i do it, but this is too damn slow. I can't profile anything at this box, because it's in production state, but if you really want me to, i'll do it tomorrow on another box. Magnus -- -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-Programmer/Networker [|] Magnus Naeslund -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
В списке pgsql-hackers по дате отправления: