Well, i have a very large database, with vary tables and very registers. Every day, too many operations are perfomed in that DB, with queries that insert, delete and update. Once a week some statistics are collected using vacuum analyze.

Have vacuum analyze running once an HOUR if it's very busy. If you are using 7.4, run the pg_autovacuum daemon that's in contrib/pg_autovacuum.

The problem is after a period of time (one month, i think), the queries takes too much time to perform. A simple update can take 10 seconds or more to perform.

If running vacuum analyze once an hour doesn't help, try running a vacuum full once a week or something to fix the problem.

Also, try upgrading to 7.4 which has indexes that won't suffer from bloat.


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