Re: 6.1 IGNORE_DERIVED_INDEXES

rob@xxxxxxxxx wrote:

<snip> BTW the default value for IGNORE_DERIVED_INDEXES in the
QAQQINI-File get changed in release 6.1. from *NO to *YES. </snip>

I believe that SSA is going to issue a statement to change it back.
I was talking to a whole team of them and I think they just were
afraid it was "change" and some of their customers might hit a
situation where that would have a negative impact - not that they
know what that situation might be...

If the SSA app has lots of queries that run CQE [Classic Query Engine] that depend on their various Slt/Omt logicals, and where sufficient SQL INDEX beyond those select\omit lndexes do not exist for use in SQE, then the change to the default may indeed be an issue for their application. That is because the application would then be running its queries using SQE, but without the benefit of any existing indexes [that are enabled to be used].

FWiW if such a statement were made [i.e. to revert the changed default], then it should probably recommend also [esp. for those who do not have an established QAQQINI file], that a QAQQINI file specific to their SSA activity is created and activated via CHGQRYA QRYOPTLIB(). In that manner the *non-SSA* query activity gets the benefit of the ability to use the improved SQE [SQL Query Engine] irrespective of the existence of any s/o logicals; i.e. as is the intent of the new\changed default.

Regards, Chuck