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How can I speed up my Database Updating?

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  • How can I speed up my Database Updating?

    I had to write a script to update a database that I call last location. This particular script makes sure that a record is the most recent in the database. The updating is done based on a field called Case_Number. If the value in Case_Number exists, it will compare the Action_Date and Action_Time fields of the incoming records with that of the one that already exists. The most current record will be kept in the database.
    If the value in Case_Number doesn't exist, then the script adds the record to the database and moves on to the next incoming record. (Mind the fact that the incoming records are coming from another database which has the identical field names and setup.) The script looks as follows:'Append_New2Last
    'The following will update Last_Location.dbf with current information from New_Location.dbf
    '=========================================================================================="C:Program FilesA5V4trackerNew_Location.dbf")
    tblNew.fetch_first()"C:Program FilesA5V4trackerLast_Location.dbf")

    WHILE .NOT. tblNew.fetch_EOF()

    WHILE .NOT. tblLast.fetch_EOF()

    IF tblNew.Case_Number = tblLast.Case_Number
    IF tblNew.Action_Date > tblLast.Action_Date
    GOTO MatchCase
    ELSEIF tblNew.Action_Date = tblLast.Action_Date
    IF tblNew.Action_Time >= tblLast.Action_Time
    GOTO MatchCase
    END IF
    END IF
    GOTO CloseTblLast
    END IF


    tblLast.Current_Location = tblNew.Current_Location
    tblLast.Action_By = tblNew.Action_By
    tblLast.Movement_Type = tblNew.Movement_Type
    tblLast.Case_Number = tblNew.Case_Number
    tblLast.Action_Date = tblNew.Action_Date
    tblLast.Action_Time = tblNew.Action_Time
    GOTO CloseTblLast

    tblLast.Current_Location = tblNew.Current_Location
    tblLast.Action_By = tblNew.Action_By
    tblLast.Movement_Type = tblNew.Movement_Type
    tblLast.Case_Number = tblNew.Case_Number
    tblLast.Action_Date = tblNew.Action_Date
    tblLast.Action_Time = tblNew.Action_Time

    tblLast.close()"C:Program FilesA5V4trackerLast_Location.dbf")


    'Dumby Line for TEsting

    The Question! How do I make this script run faster???? It has a tendancy to go slow when a number of records are being added. I can email the script if necessary.

  • #2
    RE: How can I speed up my Database Updating?

    In conjunction with Nathan's request, using the record operations option, I find that updates, appends and posts are very slow. Why? What can be done to speed things up?


    • #3
      RE: How can I speed up my Database Updating?


      I won't do it for you (because that's why I consult), but the technique is wrong. Don't search for something if you can index it (or use a temporary query if you'd prefer)

      1st ascertain if Case # exists by having an index on Case # and using key_exists.

      Now create an index (I'll call it Lastcase) that has an expression like;


      Use a Lookup function like this

      lastrecno=VAL(LOOKUPC("C",case_number,"LTRIM(STR(RECNO())","C:Program FilesA5V4trackerLast_Location.dbf","Lastcase"))

      The above will return the evaluated expression ("LTRIM(STR(RECNO())") for the record with the case # that has the latest date/time stamp.

      The recno() above may not work, so you may have to try something else.

      Now just fetch the record and do what you need.


      Ira J. Perlow
      Computer Systems Design & Associates

      Ira J. Perlow
      Computer Systems Design

      CSDA A5 Products
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      • #4
        RE: How can I speed up my Database Updating?

        Thanks for the input and I'll let you know what happens.

        Very appreciative,