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Slow Query

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  • Slow Query


    i have a form that lists in a browse all current appointments.

    i have a button defined so you can click on the appointment to open the details.

    this works fine until you get to about 10,000 records and then it starts to go fairly slow to open the form. You can see at the bottom of the screen the database going through all the records to get to the say 10,000th records.

    this is the code..

    Is there a way to speed this up?

    FUNCTION AID_ButtonClick AS V ( event AS C, data AS C , row AS N )
    'DESCRIPTION: Fired when a button is clicked on a column.
    'Arguments: event - the name of the event that is fired
    ' data - the data in the column cell
    ' row - the row number in the browse
    'this.SetViewport_Row() sets the current row to the row with the button that was clicked.
    Frm = form.load("Frm_newappointments")
    Frm.QueryRun("tbl_appointment->Aid = '" + data + "'", "")
    vChange = .t.




  • #2
    Re: Slow Query

    Do you have a permanent index for the "appointment" table that indexes the table based on the field that's displayed in your column?


    • #3
      Re: Slow Query

      hi Tom

      yes i think so... see attached . AID is the field that is selected.



      • #4
        Re: Slow Query

        I don't know if the "unique only" parameter is getting in the way. Try creating a new (additional) index on the AID field, giving it a different name, and not limiting it to "unique only".


        • #5
          Re: Slow Query

          tried that already and makes no difference. It goes through record numbers as it finds the one it wants rather than the AID.
          But i have tried setting the rec number index in descending order, but makes no difference. the problem is worse that the database is sitting on a shared pc on the network.


          • #6
            Re: Slow Query

            Is the called form based only on the appointments table?

            Does the called form have its own filter / query / order specifications?

            Does your permanent index use the entire field width or the trimmed values in the aid field?
            In order for LQO to work the index tag spec must match, exactly, the query being run in the form


            • #7
              Re: Slow Query

              The form is based on a set.. attached image..

              When the form is opened it is oped for appts for a certain date.

              They are complete fields and not trimmed.



              • #8
                Re: Slow Query

                I can't explain the results you're getting.

                Suggest you try a different strategy. Instead of querying the big table for a single record, use code that does a form find by key and then restrict navigation and enters in the called form. See help file discussion of <object>.find()