• Subject: Re: Fastest string scan
  • From: "James W. Kilgore" <qappdsn@xxxxxxx>
  • Date: Thu, 18 Sep 1997 07:42:14 +0100
  • Organization: Progressive Data Systems, Inc.

Denis Robitaille wrote:
> I have an application that display in a subfile a list of all products
> ordered by product number. It shows the product number and the product
> description. The user can request to see only the products that have a
> certain caracter string in their description (Ex: all products with the
> word "ROLLS" in them somewhere). 
> What do you think is the fastest way
> to do this?
For really large files, the fastest method I've found is to parse the
words into a separate indexed file, perform a SETLL/READ on the newly
created file then chain to the product file for remaining information.

Naturally, this new file must be maintained along with the product file.

You can build on the search to include and/or logic and wildcard
characters.  Response will be the same no matter how large the file
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