Re: huge pgstat.stat file on PostgreSQL 8.3.24

Hello

The size of statfile is related to size of database objects in database.
Depends on PostgreSQL version this file can be one per database cluster or
one per database (from 9.3),

These statistics should by reset by call pg_stat_reset()
http://www.postgresql.org/docs/9.2/static/monitoring-stats.html

Autovacuum on large stat files has significant overhead - it can be
increasing by using new PostgreSQL (9.3) and by migration stat directory to
ramdisk - by setting stats_temp_directory to some dir on ramdisk (tmpfs on
Linux)

Regards

Pavel

2014-06-19 6:38 GMT+02:00 Huang, Suya <Suya(dot)Huang(at)au(dot)experian(dot)com>:

> Hi group,
>
>
>
> We’ve found huge pgstat.stat file on our production DB boxes, the size is
> over 100MB. autovacuum is enabled. So my question would be:
>
> 1. What’s a reasonable size of pgstat.stat file, can it be
> estimated?
>
> 2. What’s the safest way to reduce the file size to alleviate the
> IO impact on disk?
>
> 3. If need to drop all statistics, would a “analyze DB” command
> enough to eliminate the performance impact on queries?
>
>
>
> Thanks,
>
> Suya
>