Trainor, Chris <chris.trai...@ironmountain.com>
wrote:
> I am trying to use the Sum function on a column in a table with ~450K
> rows in it.
>
> Select sum(Col4) from Table1
>
> It takes over 2 minutes to execute when using the original table.  I
> created an exact copy of the table with the same indices and
> constraints and inserted all the data from the original table into
> it.  Summing that column on the copied table only takes a few seconds.

Try running VACUUM on your database. Your original table is probably 
badly fragmented and results in excessive disk seeking.

Igor Tandetnik 



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