From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
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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 |
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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
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