On Mon, Feb 15, 2010 at 2:52 AM, lionel duboeuf <lionel.duboeuf@xxxxxxxxxxx> wrote: > See as attachment the "correct" query plan for an other 'user'. > I confirm by executing manual "VACUUM ANALYZE" that the problem is solved. > But what i don't understand is that i would expect autovacuum to do the job. There are two operations here. Vacuum, which reclaims lost space, and analyze which analyzes your data and stores histograms to be used when building queries, to determine how many rows are likely to be returned by each part of the plan. The autovac daemon runs both vacuums and analyzes, often independently of each other, when needed, based on threshold settings. By running autovac your db would get analyzed when necessary and would then have up to date statistics when queries were run after that. -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
