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Shadow Copy Out of Network

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  • Shadow Copy Out of Network

    I am wondering, does shadow copy work when you are not in the same network as the Master Copy?

    I have a client that needs to take a database copy on the road with him. Will the shadow copy work when he is not on the Master Copy network?

  • #2
    Re: Shadow Copy Out of Network

    As the shadow basically allows a networked user to have local layouts (forms and such) and access the data from the master, without a master you would have forms with no data. If he needs it, use a copy of the master which has all....but no way to easily synchronize if he is planning to make any changes while users are doing the same....
    Mike
    __________________________________________
    It is only when we forget all our learning that we begin to know.
    It's not what you look at that matters, it's what you see.
    Henry David Thoreau
    __________________________________________



    Comment


    • #3
      Re: Shadow Copy Out of Network

      That is the main issue. How to synchronize? I can have the client create a backup copy and use it while he is out of the office. But if any changes are made on the master copy, he will not be able to restore his copy to the master copy.

      Does any body have a solution for how to synchronize a non shadow copy?

      Comment


      • #4
        Re: Shadow Copy Out of Network

        Think about it....how would you synchronize manually? Several ways to automate somewhat but decisions would still have to be made manually for many, if not all changes. How could you possibly automate it completely when a user input correct, up to date data say, and the user who took a backup days ago, then changes the same data but is incorrect....you would have to have them side by side and visually make each decision.

        There are third party deDupe products available that follow the same principles...a side by side comparison of any changes.....you have to decide what takes priority....size, time of change, who made the change......

        This is not an easy task.....best to not even do it if possible...or have certain files off limits so that no one else makes changes to the files the Off-Network user changes.

        Just a few thoughts....
        Mike
        __________________________________________
        It is only when we forget all our learning that we begin to know.
        It's not what you look at that matters, it's what you see.
        Henry David Thoreau
        __________________________________________



        Comment


        • #5
          Re: Shadow Copy Out of Network

          Thanks MikeC that was very helpful.

          Comment


          • #6
            Re: Shadow Copy Out of Network

            As Mike says, if you download files to a mobile laptop, lock them on the server until the laptop is docked and the changes are applied.
            I you do choose this option, it is as well to set a flag on the dataset which has changed so that you only upload the actual changes - not the whole database.
            Once uploaded, the locks can be removed.
            Or.
            Something like a Web'n'Walk card working through a reverse proxy (or similar) server set up will allow working on the move.
            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.

            Comment


            • #7
              Re: Shadow Copy Out of Network

              Following first principle:Never allow users latitude to do adjudication.
              I have in practice used the following very successfully for remote sales points. I didn't have much confidence when I implemented it but has been working reliably now for years.

              Conditions:- the outreach/offsite user can run the duplicate database and programs to;-
              - Add new master records (eg customers, products, orders)
              - Perform transactions that add records (usually sales, movements or data collection)
              - produce output as necessary, that MAY change master data accordingly recording the changes
              - Perform queries and lookps of any nature,

              Method:-
              Step1. run a procedure to "send" the data. This will simply log the record count of all tables at time of transfer.
              Step2. Upon "return" run a procedure for update that will compare the record count and mimic the actions that would have taken place to update the main database for those. NO tables get copied back, data is appended or amended under program control.

              Comment


              • #8
                Re: Shadow Copy Out of Network

                Following first principle:Never allow users latitude to do adjudication.
                I have in practice used the following very successfully for remote sales points. I didn't have full confidence when I implemented it but has been working reliably now for years.

                Conditions:- the outreach/offsite user can run the duplicate database and programs to;-
                - Add new master records (eg customers, products, orders)
                - Perform transactions that add records (usually sales, movements and data collection)
                - produce output as necessary, that MAY change master data accordingly recording the changes
                - Perform queries and look-ups of any nature,

                Method:-
                Step1. run a procedure to "send" the data. This will simply log the record count of all tables at time of transfer.
                Step2. Upon "return" run a procedure for update that will compare the record count and mimic the actions that would have taken place to update the main database for those. NO tables get copied back, data is appended or amended under program control.

                Works with DBF tables where all new records are appended in record number order

                Comment


                • #9
                  Re: Shadow Copy Out of Network

                  Oops!!

                  Comment


                  • #10
                    Re: Shadow Copy Out of Network

                    I heard you the first time Ray!
                    Your solution is basically the same as mine; Append using the records which have been added or changed. The Replace Existing/Add Unique is the option I chose.
                    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.

                    Comment


                    • #11
                      Re: Shadow Copy Out of Network

                      Originally posted by Ted Giles View Post
                      The Replace Existing/Add Unique is the option I chose.
                      That first part is really what your post is all about.

                      Comment

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