I had a complaint that a job was taking nearly 3 hours to run at night in certain circumstances. In fact I'd added an SQL request on a PF without realizing the consequences. The job already took a long time before I added it, maybe half as long.

Anyway, I used the iNav index advisor to create the necessary index. Now, the job runs in 5 minutes! I am wondering why it is so much faster than before I added the lengthy SQL request?

I can't find any other SQL references in the job. RPG programs are using the PF with a CHAIN operation. I have replaced the index I created with iNav with an LF and it runs just as fast. The same PF with about 2 million records now has 7 LF.

Also, as my new LF is only currently used in my SQL request, there are no references it. How should I prevent someone from cleaning up and removing it ?


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