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Home > Archive > PostgreSQL Administration > January 2006 > Vacuum is needed or not?
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Vacuum is needed or not?
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| Szabolcs BALLA 2006-01-12, 3:24 am |
| Hi,
How do I know vacuum is need or not? I mean, are there any query to know
status of statistics, tables, indexes, etc?
(7.4.7)
Our database size bigger than just go and do it. :(
Thanks
Szabek
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| Jaime Casanova 2006-01-13, 3:23 am |
| On 1/5/06, Szabolcs BALLA <szabolcs.balla@confinsystems.com> wrote:
> Hi,
>
> How do I know vacuum is need or not? I mean, are there any query to know
> status of statistics, tables, indexes, etc?
at least, once every billion transactions to be safe...
> (7.4.7)
> Our database size bigger than just go and do it. :(
>
ahh... then execute it once a week or once a day, for avoid excessive growing...
> Thanks
> Szabek
>
>
--
Atentamente,
Jaime Casanova
(DBA: DataBase Aniquilator ;)
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| Jim C. Nasby 2006-01-13, 1:23 pm |
| On Thu, Jan 12, 2006 at 11:21:19PM -0500, Jaime Casanova wrote:
> On 1/5/06, Szabolcs BALLA <szabolcs.balla@confinsystems.com> wrote:
>
> at least, once every billion transactions to be safe...
>
>
> ahh... then execute it once a week or once a day, for avoid excessive growing...
Even once a day can be awefully conservative for many databases. Keep in
mind that every single row that is updated or deleted will hang around
in the database until you vacuum; on a busy system that can result in a
lot of wasted space. And once the bloat is there, it can be hard to get
rid of.
7.4.7 has contrib/pg_autovacuum, and I highly recommend it. Also,
http://lnk.nu/pervasive-postgres.com/7m4.asp and
http://lnk.nu/pervasive-postgres.com/7jd.asp might be interesting reads
for you.
--
Jim C. Nasby, Sr. Engineering Consultant jnasby@pervasive.com
Pervasive Software http://pervasive.com work: 512-231-6117
vcard: http://jim.nasby.net/pervasive.vcf cell: 512-569-9461
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