Re: is pg_autovacuum so effective ? - Mailing list pgsql-performance

From Markus Schaber
Subject Re: is pg_autovacuum so effective ?
Date
Msg-id 421DC4D5.1070909@logi-track.com
Whole thread Raw
In response to Re: is pg_autovacuum so effective ?  (Gaetano Mendola <mendola@bigfoot.com>)
Responses Re: is pg_autovacuum so effective ?
List pgsql-performance
Hi, Gaetano,

Gaetano Mendola schrieb:

> I have the same requirement too. Actually pg_autovacuum can not be
> instructed "per table" so some time the global settings are not good
> enough. I have a table of logs with 6 milions rows ( 3 years logs )
> I insert on that page ~ 6000 rows for day. I'm running pg_autovacuum
> with setting to ANALYZE or VACUUM table if the 10% is touched.
> With this setting pg_autovacuum will analyze that table each 3 months!!!

If you have only inserts, and only so few on a large table, you do not
need to vacuum such often. Not to reclaim space, only to prevent
transaction ID wraparound (which is ensured by pg_autovacuum).

And if the data distribution does not change, frequently calling ANALYZE
does not help much, either.

Markus

--
markus schaber | dipl. informatiker
logi-track ag | rennweg 14-16 | ch 8001 zürich
phone +41-43-888 62 52 | fax +41-43-888 62 53
mailto:schabios@logi-track.com | www.logi-track.com


Attachment

pgsql-performance by date:

Previous
From: Gaetano Mendola
Date:
Subject: Re: is pg_autovacuum so effective ?
Next
From: "Bruno Almeida do Lago"
Date:
Subject: Re: Peformance Tuning Opterons/ Hard Disk Layout