Re: Postgres 7.3.1 poor insert/update/search performance

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От Stephan Szabo
Тема Re: Postgres 7.3.1 poor insert/update/search performance
Дата
Msg-id 20030121134242.Q84028-100000@megazone23.bigpanda.com
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Ответ на Postgres 7.3.1 poor insert/update/search performance esp WRT Oracle  ("Seth Robertson" <pgsql-performance@sysd.com>)
Ответы Re: Postgres 7.3.1 poor insert/update/search performance
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On Tue, 21 Jan 2003, Seth Robertson wrote:

> The postgresql.conf file is default (my sysadmin nuked all of my
> changes when he upgraded to 7.3.1--grr) and there are some shared
> memory configs: kernel.sem = 250 32000 100 128, kernel.shmmax =
> 2147483648, kernel.shmmni = 100, kernel.shmmax = 134217728  The
> WAL is not seperated (but see below).

You almost certainly want to raise shared_buffers from the default (64?)
to say 1k-10k.  I'm not sure how much that'll help but it should help
some.

> A "vacuum analyze" is performed between the write phase and the read
> phase.  However, for your analysis pleasure, here are the results
> of a full verbose analyze and some explain results (both before and after).

BTW: what does explain analyze (rather than plain explain) show?


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