Re: preliminary testing, two very slow situations... - Mailing list pgsql-performance

From Neil Conway
Subject Re: preliminary testing, two very slow situations...
Date
Msg-id 2973.24.112.166.30.1041375927.squirrel@mailbox.samurai.com
Whole thread Raw
In response to preliminary testing, two very slow situations...  (Michael Teter <mt_pgsql@yahoo.com>)
Responses Re: preliminary testing, two very slow situations...  (Tom Lane <tgl@sss.pgh.pa.us>)
List pgsql-performance
Michael Teter said:
> I've used PostgreSQL in the past on a small project,
> and I thought it was great.
>
> Now I'm trying to evaluate it as a possible
> replacement for MS SQL Server.

[ ... ]

What version of PostgreSQL are you using?

Have you made any changes to the default configuration parameters? If not,
that's probably the first thing to look at. Several settings (e.g.
shared_buffers) are set to very conservative values by default. You can
also consider trading some reliability for better performance by disabling
fsync.

For more info on configuration, see:

http://www.ca.postgresql.org/users-lounge/docs/7.3/postgres/runtime-config.html

Another low-hanging fruit is kernel configuration. For example, what OS
and kernel are you using? Have you enabled DMA? What filesystem are you
using?

Cheers,

Neil



pgsql-performance by date:

Previous
From: Michael Teter
Date:
Subject: preliminary testing, two very slow situations...
Next
From: Minghann Ho
Date:
Subject: alter table TBL add constraint TBL_FK foreign key ... very slow