In response to Szymon Guz <mabewlun@xxxxxxxxx>: > 2010/10/7 Devrim GÜNDÜZ <devrim@xxxxxxxxxx> > > > On Thu, 2010-10-07 at 17:38 +0600, AI Rumman wrote: > > > MayVACUUM FULL on a table improve perfromance of the system? > > > > No, it will make things worse. > > That's not true, I'd rather say that it depends. The whole performance is > not just about the vacuum full. My experience: VACUUM FULL is indicated under the following conditions: * When routine vacuum has failed for a while due to some problem, or there are indicators that vacuuming was not being done often enough and that table bloat has gotten out of hand. * A major, unusual event has occurred that has cause the # of dead rows in a table to bloat far out of what happens with normal usage. I also recommend reindexing any table that has been VACUUM FULLed. As everyone else has mentioned, VACUUM FULL is not a silver bullet, and is not _guaranteed_ to improve performance. There are also very few cases where it's a good idea to do it as routine maintenance. However, it is a tool that is useful at times, and it's worthwhile to understand how it works. -- Bill Moran http://www.potentialtech.com http://people.collaborativefusion.com/~wmoran/ -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
