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Predicting Query times

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    Predicting Query times

    A while back, this post made reference to something I would like to do:

    ===========================================================
    Msg ID: 54709
    Subject: RE: Status Bar
    Author: William Hanigsberg
    Date: 02-13-2002 14:54
    File:

    Gerard,

    "...some of my clients are V-E-R-Y impatient." And I bet they let you know it.

    Check out Section 20 of the Xbasic documentation which describes methods for working with the statusbar. They are straightforward.

    That said, many users do not look at the statusbar finding it "beneath their notice." I throw up a form and write code which changes the text property of a text object as the process progresses. It is right in the middle of the screen so they cannot miss it.

    The final message is "Almost done" so you can see that my users are also impatient!

    I can help you with this method should the statusbar not suffice.

    Bill
    ==========================================================

    I too, feel that the status bar is easily overlooked and prefer to pop up my own progress bar of sorts. That's easy enough to do when the total length/number of processes is known. One aspect which I have found difficult to quantify is the time a particular query might take. If it is a second or two, there is no need to indicate progress. If it is much longer than 5-10 seconds, it's very informative for the user to know if they can go get a cup of coffee or not. Predicting the length of time a query might take is not straightforward, at least not yet, to me. I can watch for the creation of another $$xxxxx.mpx file, but predicting the name of that file is near impossible.

    There are some instances where a user tries to create a query that is overly complex and will require much more time than they would prefer. It would be handy to issue a warning when that situation arises.

    Have you, Bill, or anyone else, been able to deal with this issue effectively?

    Tom Lyon

    #2
    RE: Predicting Query times

    I have a scenario where my app is running in 10 different offices, including the home office. I ran a number of tests on all my queries, especially when they have to be run in stages, and came up with an approximate time per 1000 records - I show and refresh a text object on the form telling them the approx. time length. Its reasonably accurate, differing on the CPU speed, etc.
    Cole Custom Programming - Terrell, Texas
    972 524 8714
    [email protected]

    ____________________
    "A young man who is not liberal has no heart, but an old man who is not conservative has no mind." GB Shaw

    Comment


      #3
      RE: Predicting Query times

      Tom,

      Since every machine is a little different in speed, it is difficult to set a specific time. But here's the way. Each time you run a query, get the total time and the number of records processed (the ones in the index being used) and returned (the number of records for the query. The total processed is more indicative of the speed. If you run it on all records, just use the total record count. Divide this number by the run time and then store this number in the private directory (which is specific to a machine). This could be in a database or text file stored there. Now, the next time you run it, multiply the saved number by the records to process, maybe adding in some fudge factors, and display this number.

      Regards,

      Ira J. Perlow
      Computer Systems Design & Associates
      [email protected]
      Regards,

      Ira J. Perlow
      Computer Systems Design


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