On Mon, Sep 15, 2003 at 17:34:12 -0400,
  Joseph Bove <[EMAIL PROTECTED]> wrote:
> I do a rather simple query: select count (*) from large-table where column 
> = some value;
> About 80% of the time, the response time is sub-second. However, at 10% of 
> the time, the response time is 5 - 10 seconds.
> This is nothing readily apparent at the system level that comes close to 
> explaining the performance hits. CPU and memory usage (as measured by top) 
> appear to be fine.
> Although there are certain tuning issues within the database itself, no 
> documentation I have seen seems to indicate that tuning issues would lead 
> to such inconsistent response time.

Looking at the output from explain analyze for the query would be useful.
It may be that there are a lot of rows that have the value in the problem

---------------------------(end of broadcast)---------------------------
TIP 5: Have you checked our extensive FAQ?


Reply via email to