From: | Scott Marlowe <scott(dot)marlowe(at)gmail(dot)com> |
---|---|
To: | Robert Haas <robertmhaas(at)gmail(dot)com> |
Cc: | Josh Berkus <josh(at)agliodbs(dot)com>, Rick <richard(dot)branton(at)ca(dot)com>, pgsql-performance(at)postgresql(dot)org |
Subject: | Re: autovacuum strategy / parameters |
Date: | 2010-05-01 19:17:12 |
Message-ID: | m2mdcc563d11005011217nb578578bz68c99276ceaf0e45@mail.gmail.com |
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Lists: | pgsql-performance |
On Sat, May 1, 2010 at 1:08 PM, Robert Haas <robertmhaas(at)gmail(dot)com> wrote:
> On Sat, May 1, 2010 at 12:13 PM, Scott Marlowe <scott(dot)marlowe(at)gmail(dot)com> wrote:
>> On Fri, Apr 30, 2010 at 4:50 PM, Josh Berkus <josh(at)agliodbs(dot)com> wrote:
>>> Which is the opposite of my experience; currently we have several
>>> clients who have issues which required more-frequent analyzes on
>>> specific tables. Before 8.4, vacuuming more frequently, especially on
>>> large tables, was very costly; vacuum takes a lot of I/O and CPU. Even
>>> with 8.4 it's not something you want to increase without thinking about
>>> the tradeoff
>>
>> Actually I would think that statement would be be that before 8.3
>> vacuum was much more expensive. The changes to vacuum for 8.4 mostly
>> had to do with moving FSM to disk, making seldom vacuumed tables
>> easier to keep track of, and making autovac work better in the
>> presence of long running transactions. The ability to tune IO load
>> etc was basically unchanged in 8.4.
>
> What about http://www.postgresql.org/docs/8.4/static/storage-vm.html ?
That really only has an effect no tables that aren't updated very
often. Unless you've got a whole bunch of those, it's not that big of
a deal.
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