Re: PostgreSQL performance issues

Deblauwe Gino wrote:

> a) I didn't see a reindex in your mail. That's why a backup and a
> restore work and a vacuum doesn't
> http://www.postgresql.org/docs/current/static/sql-reindex.html
> Do this at least daily with that many inserts
>

Hello

I'am sorry to say that this advice does not sound correct.

He is talking about 10,000 transactions and 15,000 new rows per
table/day. This should not require a daily reindex of 12 indexes. It has
to be something else and more information will help to find the problem.

1GB ram sounds maybe to little for a 40GB+ database. It is difficult to
say more without knowing more about the EXPLAIN output for the selects
with problems. It would be good too to know some of the memory values in
postgresql.conf.

I can count with one hand the times that I have had to run a reindex to
fix something in the past years. We have databases with 9millons+
transactions and 2millons+ inserts/updates a day and we have never had
to run a reindex to get a good performance

PS.- RAID-0 for a database is a disaster waiting to happen.

regards
--
Rafael Martinez, <r(dot)m(dot)guerrero(at)usit(dot)uio(dot)no>
Center for Information Technology Services
University of Oslo, Norway

PGP Public Key: http://folk.uio.no/rafael/