Re: slow result

On Tue, Jan 23, 2007 at 11:34:52 +0100,
  Laurent Manchon <lmanchon@univ-montp2.fr> wrote:
> 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.

Besides the other advice mentioned in this thread, check that you don't
have a lot of dead tuples in that table. 28 seconds seems a bit high
for even a sequential scan of 800000 tuples unless they are pretty large.