On Tue, Jan 23, 2007 at 11:34:52 +0100, Laurent Manchon <[email protected]> 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.
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