Re: 6.1 IGNORE_DERIVED_INDEXES

[CRPence <CRPbottle@xxxxxxxxx>]

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