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FYI: Number of Characters in an Index Key

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  • FYI: Number of Characters in an Index Key

    Just thought someone else might want to know:

    One of the improvements to Ver 4.5 indexes that isn't documented ( I don't think it is anyway) is:

    the number of characters in an index key has been increased from 102 to 240.

    I just found this out today and thought I'd pass it on, in case there are others like I, who didn't know.

    Since Alpha Five use indexes for everything, this is a great improvement!

    I would have upgraded to ver 4.5 for this alone!

  • #2
    RE: FYI: Number of Characters in an Index Key

    Just curious, in what cases do you run into the need for the larger index filters. I try to keep mine a small as posible

    Bob Sullivan


    • #3
      RE: FYI: Number of Characters in an Index Key


      For example, yesterday I had to compare tables we created, against tables that another company created to ensure the data matched identically, field by field.

      Rather than write code, I decided to use subtract operarions to see if there were any differences.

      Alpha Five uses an index (of linking fields) to link the two tables and spit out the any differences. So in order to compare all the fields, I had specify them all in the link expression.

      With the increase in the index keylength I was able to do the comparisons.

      Though a couple of times I had to shorten the index key by using the Left() function.

      Under the previous 102 character limitation, I ran into trouble frequently.


      • #4
        RE: FYI: Number of Characters in an Index Key

        Thank you

        Bob Sullivan


        • #5
          RE: FYI: Number of Characters in an Index Key


          Here's another.

          In that article on filtering on child records I posted to Learnalpha a while back, I have a field in the parent record which holds key values of related children. The key is 3 chars plus a space which means that you can index 80 child records in 4.5.

          In my specific example the 102 has never been a problem since the child records are catagories applied to the parent and who needs 80 catagories for a book or article. But in other cases it may be useful and thus make the technique slightly more extensible.

          Bill Hanigsberg


          • #6
            RE: FYI: Number of Characters in an Index Key

            I could be wrong but I think it was 240 with 4.03 build 230. In a test I seem to recall building an index on a 240 character field (but no more than that). But like I said, I could be wrong.

            Raymond Lyons