From: Tom Lane <tgl@sss.pgh.pa.us>
To: shridhar_daithankar@persistent.co.in
Cc: pgsql-hackers@postgresql.org, pgsql-general <pgsql-general@postgresql.org>
Cc: pgsql-performance@postgresql.org
Subject: Re: [pgsql-performance] Large databases, performance
Date: Mon, 07 Oct 2002 10:30:37 -0400
Message-ID: <23489.1034001037@sss.pgh.pa.us> (raw)
In-Reply-To: <3DA1A331.21316.F7E742B@localhost>
References: <3DA1A331.21316.F7E742B@localhost>
"Shridhar Daithankar" <shridhar_daithankar@persistent.co.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
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To: pgsql-sql@postgresql.org
Cc: tgl@sss.pgh.pa.us, shridhar_daithankar@persistent.co.in, pgsql-general@postgresql.org, pgsql-performance@postgresql.org
Subject: Re: [pgsql-performance] Large databases, performance
In-Reply-To: <23489.1034001037@sss.pgh.pa.us>
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