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  3. November 2004

Re: Optimizer NOT using available indexes

At 07:38 11/25/2004, Antonio Fernandez wrote: 
    "Select * from myFileLxx where Field1 = xxx and Field2 = yyy"
or same kind of search with a Query/400

will always use the Physical file (sequential file) even though there are some different (several...) logical files (LFs) that have fields Field1 and Field2 as the first keys! (plus other different fields in each case).

When run in debug, you should see a message with text that says "Access path suggestion" or something similar. The 2nd level text on that message will show you the keys which the query wants to use. I have had problems with queries not using existing indexes if either the key fields are derived for some reason (not really in the physical table) or if the access path contains selection or exclusion logic.


Pete Hall
http://www.pbhall.us


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