RE: Chaining with a very large file

The file will be comprised of the following fields (ignore spacing this 
isn't seu compliant)

Zip1     5p
zip2     5p
dist     4p

We will have two zipcodes and the road mileage distance between those two 
postal centers.  My key would be zip1 and zip2, the third field (dist) isn't 
required.

Chain to it and display distance.



On Wed, 1 Feb 2006 12:36:04 -0500, Walden H. Leverich wrote
> >via of two possible logical files depending on the first value.
> 
> Can you explain the file a little more. W/1.1B rows, you'll need 
> both of the 5 digit fields to uniquely identify a row. Or are you 
> looking at chaining and then reading several rows?
> 
> In either case, you may want to put all 3 fields into the index. I know
> SQL will, and I believe native IO will realize that it can get all 
> the information it needs from the index and never look at the 
> physical.
> 
> -Walden
> 
> ------------
> Walden H Leverich III
> Tech Software
> (516) 627-3800 x3051
> WaldenL@xxxxxxxxxxxxxxx
> http://www.TechSoftInc.com
> 
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