|
If the query was executed by the SQE (SQL Query Engine).list
The access plan is stored within the SQE Plan Cache.
Access paths (indexes) that are used within access plans stored within the
SQE Plan Cache are not deleted before the last access plan that uses this
index disappears from the SQE Plan cache.
BTW the SQE Plan cache will be cleared with IPL.
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 Michael Ryan
Gesendet: Wednesday, 23. March 2011 17:32
An: Midrange Systems Technical Discussion
Betreff: Embedded SQL/Index/Speed/How
Ok...a co-worker had a program with an embedded SQL statement,
selecting records with a number of different criteria. It ran dog
slow. I suggested creating an index to remove some of the 'fixed'
criteria. Did that, recreated the program, ran like the wind. Then we
decided to test things out. Deleted the index. Still ran fast. Used an
old copy of the program that was created before the index was made.
Still ran fast. Deleted the index and the program, recreated the
program. Still ran fast.
What happened? Was an access plan created and stored someplace? I
would think deleting the program and index and recreating the program
would remove any consideration of an access path.
Thanks for any thoughts.
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