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.DBF index design (performance question)

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    #16
    Re: .DBF index design (performance question)

    Originally posted by DaveM View Post
    I remember that he used a 2 step process like, to text and then to access.
    Anything you can get into a delimited text file can go anywhere you want it to......
    I've actually considered exporting .dbf data into text files locally, for upload to server. (And then have AA WAS process these files (watching a "watch" directory) for weaving desktop based data into a web environment.. ~ I know I can read the data off the server (downstream) for syncing the other way..... (server to desktop)

    Anyone have suggestions as to a better method to achieve uploading? (sync)
    Robert T. ~ "I enjoy manipulating data... just not my data."
    It's all about the "framework." (I suppose an "a5-induced" hard drive crash is now in order?)
    RELOADED: My current posting activity here merely represents a "Momentary Lapse Of Reason."

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      #17
      Re: .DBF index design (performance question)

      Can't believe I revived this thread and now it makes reference to Btrieve something I needed to learn about in may latest employment.
      I found myself supporting a particular medical device that has been on the market since the days of NT4. It's been repackaged with newer OS' right up to Win7 64bit.

      Rather than retype around 300 user profiles into a very poorly constructed user interface I decided to figure out the data structure and how it was stored. After some exploring I found the software still used the the Btrieve Micro Kernel Database Engine for all data storage and retrieval.

      So for anyone that is interested here is what I learned about Btrieve.

      It was originally released with the original PC-DOS before becoming part of Novel Netware. It is a ISAM engine an Indexed Sequential Acess. This means the field structures (data dictionary) is not part of actual data files. Btrieve just writes junks of data to the selected pages. It also will build index based on parts of the junks of data. It still is available for purchase but is part of a larger re-branded product. It was very popular because of the flexibility and zero cost run time license. Lots more information can be found on Wikipedia

      To access the data inside a Btrieve file you need to obtain or construct a data dictionary files. I used a product BtSearch from Nelson Software Solutions to do this and import and export the data I wanted. My files where quite simple so it was do able. For a larger application it would be a very complicated task, and you would need to know the application that created the files really well.

      I was successful I didn't need to manually retype hundreds of users. Did this process save time in the long run, I think so but just barely.

      Another good source of Btrieve information is GoldStar Software. Somewhere on their site they even have several white papers on working with Btrieve files.

      I hope this helps someone.

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        #18
        Re: .DBF index design (performance question)

        Paul

        Good information.

        Thanks for sharing and contributing to the knowledge base.
        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

        http://www.iadn.com/images/media/iadn_member.png

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          #19
          Re: .DBF index design (performance question)

          I found Jim Kyle's site thru Goldstar - thanks for the link!
          Robin

          Discernment is not needed in things that differ, but in those things that appear to be the same. - Miles Sanford

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