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Refresh Shadow

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    Refresh Shadow

    Suppose I have application and database files on Win98 server's D drive, say D:A5DB.

    Some Win98 workstations have a D drive and a CD-Rom (E:), so they map the server's D drive as F:

    So from the workstation I run the app and network optimize it. So far so good, at least everything works.

    But now if one has a Refresh Shadow button on an app's form, it may work, but the app will no longer start because unlike after running Network Optimize, after running Refresh Shadow from the shadowed app it is now looking for a table in D:A5DB, which of course does not exist.

    Yes, one could always run the app from the server and then run Network Optimize again after making changes, but I can't expect dim witted users to do that, and for one app in particular doing so would be somewhat of a pain.

    Am I missing something?

    Ray Lyons

    RE: Refresh Shadow

    My experience with Network Optimize (invoked from the Alpha menu) is that it creates a \Shadow\Db subdirectory structure under the A5v4 where Alpha is installed. When Refresh Shadow is invoked, again from the menu, it defaults to the directory created earlier.

    You mention running Refresh Shadow from a button. I would examine the code used to do this and be sure that the drive designations are not specific to the setup of a particular machine.
    There can be only one.


      RE: Refresh Shadow

      i would use the network optimize command to recreate the shadow, rather than the refresh shadow in this case.

      in a5v5 the refresh shadow has been rewritten. it now does a complete new network optimize automatically. this has the advantage of copying any new tables to the shadow.

      also in v5 you can set a setting to automatically refresh the shadow if the master was changed.


        RE: Refresh Shadow

        >>In a5v5 the refresh shadow has been rewritten. it now does a complete new network optimize automatically.


          RE: Refresh Shadow

          Dear Ray,

          As an interim solution (and as standard practice anyway) I suggest using the UNC path rather than mapping a drive. The way you do that is to make a shortcut such as: "C:|a5v4|alpha5.exe" "|||servername|a5server|data|myapp.apd" (where | is a backslash) for access to the copy of A5 you use for editing. Also use the same shadow name (i.e. myapp_shadow)on each workstation when you optimize as this allows for use of automatically refreshing scripts (see learn for a good example). I have used it w/o problem.


            RE: Refresh Shadow

            Thanks John, I will give it a try, though right off hand I don't see how it will solve the problem. Unless I'm mistaken (I often am!) the refreshed shadow version is still going to fail to see whatever file it fails to see in the other scenario.


              RE: Refresh Shadow

              Dear Ray,

              One other point I forgot to make is that you must also change any explicit paths use in scripts such as '"D:|a5v4|data|mytable.dbf")'. Use instead '"|||servername|a5v4|data|mytable.dbf"). Use this method also in your script that refreshes the database which you should attach to the autoexec script. The point being that A5, in the first example, is looking for the data files on drive "D". If correctly mapped, no problem. But if the workstation maps the correct drive as "F" or whatever it won't find them. The unc path always points to the correct path.


                RE: Refresh Shadow

                Thanks, but I don't use explicit paths anywhere in my applications.


                  RE: Refresh Shadow

                  And may the Supreme Being of All Data have mercy on your soul if you do use an explicit directory path! :?)

                  As all should know, if you must code a path that's not relative to the Private, Shared, Application and tables, then you should have 1 and only 1 location that set's the value (typically a lookup database, variable in Autoexec script, DOS environment variable etc.)


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

                  Ira J. Perlow
                  Computer Systems Design

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