On Wed, Jun 22, 2005 at 02:03:29AM -0700, Aditya Damle wrote: > > Hello. I believe in earlier versions, a query of the > form > select attrib from ttt where attrib like 'foo%' would > be able to take advantage of an index. I have seen > this in the past. Currently I am using v8.0.3. From > what I can see is that the execultion plan seems to > use a seq scan and to totally ignore the index. Is > this the case?
8.0.3 can certainly use indexes for LIKE queries, but the planner will choose a sequential scan if it thinks that would be faster. Have you vacuumed and analyzed your tables? Could you post the EXPLAIN ANALYZE output of a query, once with enable_seqscan turned on and once with it turned off? See also "Operator Classes" in the "Indexes" chapter of the documentation: http://www.postgresql.org/docs/8.0/static/indexes-opclass.html What locale are you using? -- Michael Fuhr http://www.fuhr.org/~mfuhr/ ---------------------------(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
