Re: does VACUUM ANALYZE complete with this error?
От | Susan Russo |
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Тема | Re: does VACUUM ANALYZE complete with this error? |
Дата | |
Msg-id | 200705231903.l4NJ3vuT014318@larrys.harvard.edu обсуждение исходный текст |
Ответ на | does VACUUM ANALYZE complete with this error? (Susan Russo <russo@morgan.harvard.edu>) |
Ответы |
Re: does VACUUM ANALYZE complete with this error?
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Список | pgsql-performance |
Hi Tom - thanks for the additional/confirming info. >So you definitely have got a problem of needing more vacuuming... Yes, we're going to nightly, as I said in last message, however, it worse than this..... I found that *1* vacuum analyze works well in many instances to help optimize query performance (which in one example was running in lightening speed on 2 of our 5 identical software/hardware/configs Pg 8.1.4 servers). However, in several cases, a *2nd* vacuum analyze was necessary. (btw - first vacuum was after adjusting max_fsm_pages, and getting no error msgs from vacuum). I *think* - please advise, I may be able to affect configs for a more effective vacuum analyze the first time around (??) Perhaps an increase to deafult_statistics_target (set to 100??). I'd read that when performing a vacuum analyze, Pg doesn't actually go through all values in each table and update statistics, rather, it samples some of the values and uses that statistical sample. Thus, different runs of the vacuum analyze might generate different statistics (on different dbs on different servers) since the same db may be used differently on a different server. Is this correct?? Thanks for any advice....I'm hoping regular duplicate vacuum analyze isn't the solution... Susan
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