Re: [pgsql-performance] Large databases, performance

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: shridhar_daithankar(at)persistent(dot)co(dot)in
Cc: pgsql-hackers(at)postgresql(dot)org, pgsql-general <pgsql-general(at)postgresql(dot)org>, pgsql-performance(at)postgresql(dot)org
Subject: Re: [pgsql-performance] Large databases, performance
Date: 2002-10-07 14:30:37
Message-ID: 23489.1034001037@sss.pgh.pa.us
Views: Raw Message | Whole Thread | Download mbox | Resend email
Thread:
Lists: pgsql-general pgsql-hackers pgsql-performance pgsql-sql

"Shridhar Daithankar" <shridhar_daithankar(at)persistent(dot)co(dot)in> writes:
> MySQL 3.23.52 with innodb transaction support:

> 4 concurrent queries :- 257.36 ms
> 40 concurrent queries :- 35.12 ms

> Postgresql 7.2.2

> 4 concurrent queries :- 257.43 ms
> 40 concurrent queries :- 41.16 ms

I find this pretty fishy. The extreme similarity of the 4-client
numbers seems improbable, from what I know of the two databases.
I suspect your numbers are mostly measuring some non-database-related
overhead --- communications overhead, maybe?

> Only worry is database size. Postgresql is 111GB v/s 87 GB for mysql. All
> numbers include indexes. This is really going to be a problem when things are
> deployed. Any idea how can it be taken down?

7.3 should be a little bit better because of Manfred's work on reducing
tuple header size --- if you create your tables WITHOUT OIDS, you should
save 8 bytes per row compared to earlier releases.

regards, tom lane

In response to

Responses

Browse pgsql-general by date

  From Date Subject
Next Message Shridhar Daithankar 2002-10-07 14:39:55 Re: [pgsql-performance] Large databases, performance
Previous Message Shridhar Daithankar 2002-10-07 14:18:31 Re: Large databases, performance

Browse pgsql-hackers by date

  From Date Subject
Next Message Shridhar Daithankar 2002-10-07 14:32:46 Re: Table spaces again [was Re: Threaded Sorting]
Previous Message Tom Lane 2002-10-07 14:21:21 Re: pg_filedump

Browse pgsql-performance by date

  From Date Subject
Next Message Shridhar Daithankar 2002-10-07 14:39:55 Re: [pgsql-performance] Large databases, performance
Previous Message Shridhar Daithankar 2002-10-07 14:18:31 Re: Large databases, performance

Browse pgsql-sql by date

  From Date Subject
Next Message Shridhar Daithankar 2002-10-07 14:39:55 Re: [pgsql-performance] Large databases, performance
Previous Message Shridhar Daithankar 2002-10-07 14:18:31 Re: Large databases, performance