----- Original Message ----- From: Gary Doades <[EMAIL PROTECTED]> Date: Tue, 31 Aug 2004 20:21:49 +0100 Subject: Re: [PERFORM] Optimizing a request To: [EMAIL PROTECTED]
> Have you run ANALYZE on this database after creating the indexes or loading the > data? the indexes are created and the data loaded and then, I run vacuum analyze. >What percentage of rows in the "article" table are likely to match the keys selected from the "rubrique" table? only 1 record. If it is likely to fetch a high proportion of the rows from article then it may be best that a seq scan is performed. What are your non-default postgresql.conf settings? It may be better to increase the default_statistics_target (to say 100 to 200) before running ANALYZE and then re-run the query. yes, default_statistics_target is set to the default_value. I have just increased shared_buffers and effective_cache_size to give advantage of 1 Mb RAM -- Jean-Max Reymond CKR Solutions http://www.ckr-solutions.com ---------------------------(end of broadcast)--------------------------- TIP 6: Have you searched our list archives? http://archives.postgresql.org
