Re: Tuning/performance issue...

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От Bruce Momjian
Тема Re: Tuning/performance issue...
Дата
Msg-id 200310040139.h941deb01679@candle.pha.pa.us
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Ответ на Re: Tuning/performance issue...  (Oleg Lebedev <oleg.lebedev@waterford.org>)
Ответы Re: Tuning/performance issue...  (Rod Taylor <rbt@rbt.ca>)
Re: Tuning/performance issue...  (Jeff <threshar@torgo.978.org>)
Список pgsql-performance
I have updated the FAQ to be:

      In comparison to MySQL or leaner database systems, we are
      faster for multiple users, complex queries, and a read/write query
      load.  MySQL is faster for SELECT queries done by a few users.

Is this accurate?  It seems so.

---------------------------------------------------------------------------

Oleg Lebedev wrote:
> Jeff,
> I would really appreciate if you could send me that lengthy presentation
> that you've written on pg/other dbs comparison.
> Thanks.
>
> Oleg
>
> -----Original Message-----
> From: Jeff [mailto:threshar@torgo.978.org]
> Sent: Wednesday, October 01, 2003 6:23 AM
> To: David Griffiths
> Cc: pgsql-performance@postgresql.org
> Subject: Re: [PERFORM] Tuning/performance issue...
> Importance: Low
>
>
> On Tue, 30 Sep 2003, David Griffiths wrote:
>
> >
> > This is all part of a "migrate away from Oracle" project. We are
> > looking at 3 databases - MySQL (InnoDB), Postgres and Matisse (object
> > oriented). We have alot of queries like this
> > or worse, and I'm worried that many of them would need to be
> re-written. The
> > developers
> > know SQL, but nothing about tuning, etc.
> >
>
> There's a movement at my company to ditch several commercial db's in
> favor of a free one.  I'm currently the big pg fan around here and I've
> actually written a rather lengthy presentation about pg features, why,
> tuning, etc. but another part was some comparisons to other db's..
>
> I decided so I wouldn't be blinding flaming mysql to give it a whirl and
> loaded it up with the same dataset as pg.  First thing I hit was lack of
> stored procedures.   But I decided to code around that, giving mysql the
> benefit of the doubt.  What I found was interesting.
>
> For 1-2 concurrent
> 'beaters' it screamed. ultra-fast.  But.. If you increase the concurrent
> beaters up to say, 20 Mysql comes to a grinding halt.. Mysql and the
> machine itself become fairly unresponsive.  And if you do cache
> unfriendly
> queries it becomes even worse.   On PG - no problems at all. Scaled fine
> and dandy up.  And with 40 concurrent beaters the machine was still
> responsive.  (The numbers for 20 client was 220 seconds (pg) and 650
> seconds (mysql))
>
> So that is another test to try out - Given your configuration I expect
> you have lots of concurrent activity.
>
> --
> Jeff Trout <jeff@jefftrout.com>
> http://www.jefftrout.com/
> http://www.stuarthamm.net/
>
>
>
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--
  Bruce Momjian                        |  http://candle.pha.pa.us
  pgman@candle.pha.pa.us               |  (610) 359-1001
  +  If your life is a hard drive,     |  13 Roberts Road
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