AW: Using an SQL index over DDS file?

Just because I' curious, it is the CQE which executes the query, isn't it?

AFAIK in the SQE SELECT DISTINCT and GROUP BY are treated equally, i.e. the
base query for SELECT DISTINCT gets rewritten for GROUP BY (or vice versa).
In either way before tuning the CQE, try to get the query executed by the
SQE and tune after.

Mit freundlichen Grüßen / Best regards

Birgitta Hauser

"Shoot for the moon, even if you miss, you'll land among the stars." (Les
Brown)
"If you think education is expensive, try ignorance." (Derek Bok)
"What is worse than training your staff and losing them? Not training them
and keeping them!"

-----Ursprüngliche Nachricht-----
Von: midrange-l-bounces@xxxxxxxxxxxx
[mailto:midrange-l-bounces@xxxxxxxxxxxx] Im Auftrag von Loyd Goodbar
Gesendet: Monday, 26. July 2010 22:20
An: Midrange Systems Technical Discussion
Betreff: Re: Using an SQL index over DDS file?

Success!

Apparently DISTINCT and GROUP BY indeed act differently under the covers,
because DISTINCT took ~60-90 seconds while GROUP BY was 100ms. VE reports
using an index scan with the new index. Perhaps DISTINCT does not take
advantage of indexes? It seems unlikely.

Thanks everyone for the help and suggestions!

--Loyd