In a message dated 3/25/2004 3:54:46 AM Eastern Standard Time, Clare.Holtham@xxxxxxxxxxxxxx writes: > That's one of the indexes you ALWAYS want to build. The Optimizer may well > use it for statistics (data skew). Or it may want to use an index from index > access method or whatever. > Or do you mean you have already created the index? That can happen too. When > the optimizer looks for an index, it may use different criteria or time out > before it gets to the right one. These rules are different depending which > version of the OS/400 you have. Sometimes it searches fifo, sometimes the > other way, etc. > If the file is really huge you could also try creating an EVA index. > If you are on V5R2 there are now two different SQL Optimizers with different > rules, and a new statistics gatherer. > If you're in the US, I believe IBM do workshops on this subject.... > > cheers, > > Clare > > Clare Holtham > Director, Small Blue Ltd - Archiving for BPCS > Web: www.smallblue.co.uk > IBM Certified AS/400 Systems Professional Rumor has it that if you create the index with SQL rather then with DDS that the SQL will like it more better. Jack D.
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