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Index updating while shared

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  • #16
    Re: Index updating while shared

    Hi John,

    Originally posted by johngtatp View Post
    The code is a calculated field on a form,
    The formula is:
    numrentcars = dbcount("rcardetail","resnum_type",*concat_keys(resnum,type))
    The resnum_type index has an order expression of *CONCAT_KEYS(RESNUM,TYPE) with no filter

    The numrentcars is displayed in a embedded browse

    All users have this form open and have the network refresh set every 15 seconds. When one user saves a record which should update the count, the other machines sometimes reflect the change and sometimes do not. If you restart alpha (not just close and open the form) the correct count is always displayed. I have also tried using a button that has an action script to refresh the display which in xbasic is:
    topparent.Commit()
    topparent.Resynch()
    topparent.Refresh_Layout()
    but that does not refresh the count when it is incorrect. I hope that makes sense.
    The DBCOUNT and it's usage looks correct. *CONCAT_KEYS() is a newer function that I don't think you need here, and while it looks correct, I'd try a simpler resnum+type expressions in place of it and the index order expression to eliminate that as a possible problem.

    The Calculated field will not automatically update unless resnum or type in the parent table change while in change mode, or when saving a record. In view mode it will probably never change except upon fetch of a new parent record, or possibly when a network refresh occurs (By the way, a network refresh eats up a lot of network bandwidth if you have many users and only happens during view mode. Not recommended)

    Rather than using numrentcars on the embedded browse, try placing it as a form field instead. This may have something to do with it.

    You may also still have to refresh the field manually to have it update while not doing anything, but I'd do it just to that field, not the whole form (It would have to effectively force a recalc of calc fields.)

    Another way would to get this value which may be beyond your current abilities is to recalculate the value on events like onfetch and onsave to a variable and display the variable on the form.
    Regards,

    Ira J. Perlow
    Computer Systems Design


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    • #17
      Re: Index updating while shared

      Another way would to get this value which may be beyond your current abilities is to recalculate the value on events like onfetch and onsave to a variable and display the variable on the form.
      I think this is especially promising. If you didn't mind spending the processing time, or the increased network traffice this would cause, you could put such a script in the onTimer event for the form.

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      • #18
        Re: Index updating while shared

        Update: There is an issue when using indexes in a multi user enviornment. In my case both users are on the same form and have cached the index if another user makes a change that say a calculated field needs to use, i.e. dbcount in my case, the first user will not see the change until they themselves make a change which requires the index to be re-read. A new function has been added which I am about to try and here is the verbiage from the pre-release

        <table>.flush_indexes() Method - Causes Alpha Five to reload index key values.

        This method would only be needed in the following condition:
        1.Two or more Alpha Five instances are running (e.g. user1, user2)
        2.Both users have a form based on the same table open.
        3.User2 makes a change that causes an index update.
        4.User1 executes some Xbasic (such as a db_count(), or lookupc()) which relies on an index. Since user1 has cached the index keys, he will not see user2's changes unless he first re-reads the index.

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        • #19
          Re: Index updating while shared

          Ok, another suggestion John.
          Would it be possible to use the POST feature to maintain a running total?
          Then a simple RefreshObject would display the current information.
          See our Hybrid Option here;
          https://hybridapps.example-software.com/


          There are 3 things you can do in any situation;
          Live with it, Change it or Walk away from it.

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          • #20
            Re: Index updating while shared

            Originally posted by johngtatp View Post
            Update: There is an issue when using indexes in a multi user enviornment. In my case both users are on the same form and have cached the index if another user makes a change that say a calculated field needs to use, i.e. dbcount in my case, the first user will not see the change until they themselves make a change which requires the index to be re-read. A new function has been added which I am about to try and here is the verbiage from the pre-release
            Where did you hear about this "flush_indexes" method? Is it something you created? I tried it in A5v9, v10, and v11 and got "property not found" every time.

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            • #21
              Re: Index updating while shared

              Originally posted by CALocklin View Post
              Where did you hear about this "flush_indexes" method? Is it something you created? I tried it in A5v9, v10, and v11 and got "property not found" every time.
              http://downloads.alphasoftware.com/A...easenotes.html

              use the browser find
              Al Buchholz
              Bookwood Systems, LTD
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              Occam's Razor - KISS
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              • #22
                Re: Index updating while shared

                Ahh! I missed the "pre-release" comment. I guess that explains why it's not recognized in my current version. Thanks.

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