Thanks. What about auto-analyze? When will they be analyzed by default? And what actions generally require new analyze? On 2/15/12, Bruce Momjian <bruce@xxxxxxxxxx> wrote: > On Wed, Feb 15, 2012 at 09:14:34AM -0500, Robert James wrote: >> What rules of thumb exist for: >> * How often a table needs to be vacuumed? >> * How often a table needs to be analyzed? >> * How to tune Autovacuum? >> >> I have a large DB server, and I'm concerned that it's not being >> autovaccumed and autoanalyzed frequently enough. But I have no idea >> what proper values should be? >> >> A related question: If I INSERT a large number of records per day, >> similar in nature to the existing records, does that require new >> vacuum? new analyze? Or do I only need those for DELETEs or changes to >> the nature of records? >> >> Finally: What type of performance impact can I expect from vacuum and >> analyze, in general? > > Unless you are very high-volume, the auto-vacuum default settings are > fine. The default do allow up to 20% of unused space in tables, but > making that lower is expensive to performance. > > -- > Bruce Momjian <bruce@xxxxxxxxxx> http://momjian.us > EnterpriseDB http://enterprisedb.com > > + It's impossible for everything to be true. + > -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
