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Speeding Up an Append

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  • Speeding Up an Append

    I have an arlog table that stores a single line item for each "invoice" posted... customer, invoice #, invoice date, etc... From here i run aging reports, etc. When money comes in i have an "append" operation that goes to the arlog and appends all records that has a balance<>0 into a artemp table. Once the records are appending i have a way for them to mark the invoices being paid, etc.. then when they "post" it goes and finds the invoices marked in the arlog and posts the payments, etc. The marking and posting works great, but

    My problem is that as the arlog table grows it is taking longer and longer to "append invoices with a balance"... because it is going through each record to find the ones with balance<>0.. and not all my customers are in newer, faster computers, so it is getting to be up to 10 minutes to bring them over.

    Is there a faster way to append records from one table to another with a filter beside using the typical append operation.. I have had a few of you "experts" helping me write functions for other features that seem to do much more than just this and they work super fast, so it seems there should be a way to create a function to do this same process to make it fast? But i'm still not sure how and when to setup functions, so i'm not sure what to do here.

    Any ideas?

  • #2
    Re: Speeding Up an Append

    Hi Lynda,

    I'm not sure about any super fast functions, but what does come to mind is an archive table.

    This would be a routine run at some convenient time where all the records that have a balance = 0 get appended to the archive table and then are deleted from arlog table, thereby keeping it down to just the records with a balance not = 0.
    Last edited by Keith Hubert; 08-17-2008, 10:16 PM.
    Regards
    Keith Hubert
    Alpha Guild Member
    London.
    KHDB Management Systems
    Skype = keith.hubert


    For your day-to-day Needs, you Need an Alpha Database!

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    • #3
      Re: Speeding Up an Append

      Linda, look for message threads discussing appends and indexes (or index). IIRC the append updates the index after each record is processed. Opening another copy of the table first, changes the behavior delaying the index rebuild until all are processed. The result is a faster append. Hope I'm remembering this correctly. Of course a hand crafted script would obviate the need of using the append operation at all. -- tom

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      • #4
        Re: Speeding Up an Append

        ==Opening another copy of the table first, changes the behavior delaying the index rebuild until all are processed. The result is a faster append.

        Not sure what you mean by "opening another copy of the table first", can you elaborate.

        ==Of course a hand crafted script would obviate the need of using the append operation at all.

        Would you mind giving me an idea of how to do it in a script without an append operation?

        thanks for the info on appends and index - i'll do a search right now

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        • #5
          Re: Speeding Up an Append

          Linda,

          1) if you don't have an index on the balance field in the arlog table, build one. It will help Alpha find the non-zero records faster.

          2) the custom script would do this (pseudo code)

          Code:
          -open the arlog table for read only access
          -use LQO to find the non-zero records
          -open the artemp table for read/write access
          -loop through all of the records in the query list
          -for each record enter a new record to the artemp table like this:
          --- tbl_ptr.enter_begin()
          --- tbl_ptr.customer = arlog_ptr.customer
          --- tbl_ptr.account = arlog_ptr.account
          ------and so on
          --- tbl_ptr.enter_end(.t.)
          -drop the query from the arlog table
          -close the arlog table
          -close the artemp table

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          • #6
            Re: Speeding Up an Append

            Linda, there's a good example of how to populate a second table by looping through the records in a different table in Dr. Wayne's book "Application Progarmming in Alpha Five Version 5", at pg. 192. I don't think this book is still in print, but maybe it's on your shelf? -- tom

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