Re: Stored Procedure Speed/Visual Explain

Michael

S/O logicals were ignored by default at first, then at 6.1, they can be used, especially if they match selection criteria.

But a normal index is just as good when you don't know what will be chosen for selection. I.e., for more general use.

If you are using a QAQQINI, you can check the IGNORE_DERIVED_INDEX setting. Also, in 7.1, you can put a WHERE clause on an index - this is just like an S/O with probably more possibilities.

HTH
Vern

On 10/18/2013 9:43 PM, TheBorg wrote:

Michael -

Since DDS logical files can share the access path of a DB2 index, if you
create any new indexes it may be advisable to delete and recreate the
associated logical files.

-sjl

"Michael Ryan" wrote in message
news:mailman.10988.1382037606.9013.midrange-l@xxxxxxxxxxxx...

Thanks Gary...I'll do that next. I think some/most of the logicals may have
select/omit criteria, and I think that disallows them from consideration.
Right?


On Thu, Oct 17, 2013 at 2:50 PM, Gary Thompson <gthompson@xxxxxxxxxxx>wrote:

Michael,
If nothing from the Advisor, have you at least
checked all Where clauses in your SP for a match
or near match to existing index/LF ?

-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx [mailto:
midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Michael Ryan
Sent: Thursday, October 17, 2013 12:31 PM
To: Midrange Systems Technical Discussion
Subject: Stored Procedure Speed/Visual Explain

Visual Explain/index Advisor woes. I have a stored procedure that calls an
RPG procedure that returns a result set. All is well. But it's slow. So I
take the stored procedure call, put it into Navigator->Run SQL Scripts,
highlight the statement, click Visual Explain, get a chart of objects used
in the query, click Actions->Advisor, and no indexes are suggested. This
query can take a long time to run - 50+ seconds first time, 30+ seconds
after that.

How can I get more information regarding the indexes used or needed?

Thanks!
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