Hi,
I would like to know if someone have a solution for me ...
I have a table with today about 2,8 millions records.
The table have good indexes, in our case on idcond, and points !
When I do :
select sum(points) from gains;
With Oracle : 8 sec
With PostGreSQL : 10 sec
OK for this it's ok ...
But when I do :
select sum(points) from gains group by idcond;
With Oracle : 22 sec
With PostGreSQL : about 3 minutes !!!
I have done a vacuum analyse of the table gains ... just before testing
...
What can I do to optimize that result ?
Why the group by function is so slow ??
Thanks for your help !
Regards,
--
Hervé
