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Automatic file re-indexing

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  • Automatic file re-indexing

    Why is it that when making some changes or appends to a parent child set and have exclusive use of the file Alpha starts re-indexing the file? This slows down some operations. I am using Alpha 12. I never had this in Alpha 11

  • #2
    I'm not aware of anything that could explain the different behavior you're reporting (between v11 and AA). Perhaps an explanation might be forthcoming with a more detailed explanation of the sequences you're running.

    Questions that occur to me:
    - Are you working with native (DBF) tables?
    - Sets don't have indexes, tables do. what do you mean when you say "Alpha starts re-indexing the file"? what file? The parent, the child, or both?
    - Are you trying to update parent table records at the same time you are updating child table records?
    - Are you running saved operations back to back, using a single script that calls each operation in turn?


    Comment


    • #3
      Tom

      I have a set that is a log app that the parent has a log number and the child table is related by this log number. I have an operation that changes that log number of the child. This allows the user to combine/merger logs items.

      One of the indexes is on the log number for the child table. When I run the operation to update the log number when no one else is on the network is using that child table, Alpha rebuilds all the indexes. However, when someone else is in that child table at the time the operation is run then no rebuild occurs.

      Comment


      • #4
        My spider sense is telling me there is something wrong with the design of this.

        If Alpha is updating indexes only when you have exclusive control, then you're probably getting out of synch indexes when it doesn't.

        Changing linking fields is problematic.

        Consider having another field for linking that is not viewed by the user and doesn't change.

        Then you simply change the parent log number and the parent/child set now relates the new parent log number to the child without having to change child records.

        I do this with the linking field being 32 characters and its value is set at the parent by api_uuidcreate()

        I cal the field SID or LINKING_FIELD depending on my mode of the day.

        You'll find SID in many relational databases doing this.

        In QuickBooks, it's name varies from LISTID to TRANSID depending on the type of table.
        Al Buchholz
        Bookwood Systems, LTD
        Weekly QReportBuilder Webinars Thursday 1 pm CST

        Occam's Razor - KISS
        Normalize till it hurts - De-normalize till it works.
        Advice offered and questions asked in the spirit of learning how to fish is better than someone giving you a fish.
        When we triage a problem it is much easier to read sample systems than to read a mind.
        "Make it as simple as possible, but not simpler."
        Albert Einstein

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        • #5
          The situation is I have a log number 1 with 20 child records related by log # 1. I have another log number 2 with 10 child records related but the log #2. I run a procedure to change the log number on the 10 record in the child from log #2 to log #1. Resulting in 30 child records now appear in Log #1 and 0 records in log #2

          How would using a hidden SID or Linking_field solve this problem?

          Just some background. This is an application that I am migration from Alpha 4 v6. This same operation worked without issue in this DOS version.

          Any insight is very much appreciated

          Thanks
          Pat



          Comment


          • #6
            That's more information to understand what is going on.

            Something else is going on cuz it doesn't fit what I would expect to happen.

            If you run the same system in Alpha v11 you get the same behavior?
            Al Buchholz
            Bookwood Systems, LTD
            Weekly QReportBuilder Webinars Thursday 1 pm CST

            Occam's Razor - KISS
            Normalize till it hurts - De-normalize till it works.
            Advice offered and questions asked in the spirit of learning how to fish is better than someone giving you a fish.
            When we triage a problem it is much easier to read sample systems than to read a mind.
            "Make it as simple as possible, but not simpler."
            Albert Einstein

            Comment


            • #7
              Pat, I'll assume you're working with DBF tables, and that you're not running operations one after the other from a single script. It helps us help you if you answer questions we ask, even if you think they're pointless :)

              I share Al's view that there's something else going on here. If you close all forms and run the operation from the control panel, while no one else is using Alpha does reindexing occur?

              Is the link from parent to child a simple link based on a single field, or a complex expression?

              Is the index "filtered" in any way?

              -- tom

              Comment


              • #8
                Going from 4 to 5 is not as simple as it's made out to be.
                There are huge differences, not least if which is the Set construction.

                Alpha is doing what you have asked it to do, so maybe you need to ask it a different question - as in rethinking the design.
                Ted Giles
                Example Consulting - UK
                .

                sigpichttp://ec12.example-software.com//
                See our site for Alpha Support, Conversion and Upgrade.

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