Re: PANIC killing vacuum process

Kevin Grittner ha scritto:
> Scott Marlowe <scott.marlowe@gmail.com> wrote:
>
>> Silvio Brandani <silvio.brandani@tech.sdb.it> wrote:
>>
>
>
>>> we have develop a script to execute the vacuum full on all tables
>>>
>
>
>> Vacuum full is more of a recovery / offline command and is to be
>> used sparingly, especially before 9.0.
>>
>
> And before 9.0, most of the situations where you might reasonably
> consider VACUUM FULL, you were better off with CLUSTER.
>
>
>>> very big database , since it is a 24 x 7 available system we have
>>> not a timeframe to exec the vacuum full.
>>>
>> Is there a reason you're avoiding autovacuum and tuning it to keep
>> up?  It's usually the better option.
>>
>
> Even if you have a case for doing database vacuums during off-peak
> hours, you should almost certainly use autovacuum with settings at
> least as aggressive as the default.  At our shop we configure
> autovacuum more aggressively than the default, to keep our small,
> volatile tables tidy, and run a vacuum of the entire database each
> night (which is, by the way, a very different thing than a VACUUM
> FULL).
>
>
>>> PostgreSQL 8.3.1 on x86_64-redhat-linux-gnu
>>>
>> Is there a good reason for avoiding about two years of updates
>> (8.3.latest has a lot of bug fixes.)
>>
>
> Yeah, this is important.  See this page:
>
> http://www.postgresql.org/support/versioning
>
> Many of those fixes to 8.3 after 8.3.1 were to vacuum or autovacuum.
> You can poke around the release notes here:
>
> http://www.postgresql.org/docs/8.3/static/release.html
>
> If problems with autovacuum were what drove you toward VACUUM FULL,
> you should update and try autovacuum again.  Going from 8.3.1 to
> 8.3.12 is pretty painless and very safe -- just read the release
> notes for details on what types of indexes need to be rebuilt after
> the update.  (That probably won't affect you, but you should check.)
>
> -Kevin
>
>
Thanks a lot.
We will migrate to 8.3.12 and keep autovacuum running instead of vauum full.




--
Silvio Brandani


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