On Wed, Nov 09, 2005 at 01:08:07PM +0100, Jan Kesten wrote: > Now my problem: I need really many queries of rows using it's primary > key and fetching about five different columns but these are quite slow > (about 10 queries per second and as I have some other databases which > can have about 300 queries per second I think this is slow): > > transfer=> explain analyse SELECT * FROM test WHERE test_a=9091150001 > AND test_b=1 AND test_c=2 AND test_d=0 AND test_e=0; > > Index Scan using test_idx on test (cost=0.00..50.27 rows=1 width=1891) > (actual time=0.161..0.167 rows=1 loops=1) > Index Cond: (test_a = 9091150001::bigint) > Filter: ((test_b = 1) AND (test_c = 2) AND (test_d = 0) AND (test_e 0))
You don't post your table definitions (please do), but it looks like test_b, test_c, test_d and test_e might be bigints? If so, you may want to do explicit "AND test_b=1::bigint AND test_c=2::bigint" etc. -- 7.4 doesn't figure this out for you. (8.0 and higher does.) /* Steinar */ -- Homepage: http://www.sesse.net/ ---------------------------(end of broadcast)--------------------------- TIP 9: In versions below 8.0, the planner will ignore your desire to choose an index scan if your joining column's datatypes do not match
