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slow result

From: Laurent Manchon <lmanchon(at)univ-montp2(dot)fr>
To: pgsql-performance(at)postgresql(dot)org
Subject: slow result
Date: 2007-01-23 10:34:52
Message-ID: 5.0.2.1.2.20070123113422.00d189e8@pop.univ-montp2.fr (view raw or flat)
Thread:
Lists: pgsql-performance
Hi,

I have a slow response of my PostgreSQL database 7.4 using this query below
on a table with 800000 rows:

select count(*)from tbl;

PostgreSQL return result in 28 sec every time.
although MS-SQL return result in 0.02 sec every time.

My server is a DELL PowerEdge 2600 with bi-processor Xeon at 3.2 Ghz
with 3GBytes RAM


My PostgreSQL Conf is
*********************
log_connections = yes
syslog = 2
effective_cache_size = 50000
sort_mem = 10000
max_connections = 200
shared_buffers = 3000
vacuum_mem = 32000
wal_buffers = 8
max_fsm_pages = 2000
max_fsm_relations = 100

Can you tell me is there a way to enhence performance ?

Thank you





+-----------------------------------------------------+
| Laurent Manchon                                     |
| Email: lmanchon(at)univ-montp2(dot)fr                     |
+-----------------------------------------------------+

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