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  3. August 2013

Re: Index Selection

Same work management set up? (subsystem, memory, routing entry, etc) Those things can affect some of the decisions made.

More recently with systems that are doing more and more SQL, I have been turning off the automatic tuning feature of IBM i, since every time it makes and adjustment to memory or activity level the query needs to re-optimize. Leaving memory and activity levels alone, optimizes the optimizer to be slightly obtuse about it.


Jim Oberholtzer
Chief Technical Architect
Agile Technology Architects

On 8/9/13 1:56 PM, Michael Ryan wrote:
Ok...two systems, both on 7.1. Execute STRDBG UPDPROD(*YES). Run a program
on system A. Job log shows an index was used for bit map processing. Run
the same program on system B. Same index in place (though different
libraries). System B job log says arrival sequence was used. How can I
figure out why the index is used on one system and not the other? Thanks!
--


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