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  3. August 2008

Re: Sorting records in Physical and Logical files

Walden H. Leverich wrote:
Yes, with a level of knowledge I'll never have or want. The number of
rows in the table, the distribution of the values, the "busyness" of the
machine, the availability of memory, these are but a few of the details
that go into a query optimization.
Of course, a lot of that depends on the optimizer guessing correctly what you want, but that's what a query optimizer is supposed to do. You just have to make sure you tell it correctly, and thus the requirement for things like QAQQINI.

I don't want to think about this
stuff, I just want the orders for customer 22212 as fast as I can get
them.
And this makes sense. Of course, if the requirement is "get me the customer master info for customer 22212 as fast as I can gget it" then the right tool *is* ISAM.

Joe

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