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Which front-end gets there first

  1. #1
    knarfreppep is offline Competent Performer
    Windows 8 Access 2013
    Join Date
    Feb 2015
    Location
    Adelaide, Australia
    Posts
    105

    Which front-end gets there first

    Hello everyone!

    I have a front-end/back-end application.

    I want a front-end to compact the back-end each morning.

    Obviously the front end which will do the job must stop other front-ends from proceeding.

    I figure there's some chance of two front-ends trying at exactly the same time.

    So I'm thinking I'll generate a large random number and let the front-end with say the biggest number proceed if there are two or more.

    So my question for very clever mathematicians is: what are the odds of the code below returning the same number from say 10 front-ends please? -



    Code:
    Public Function sngNumber() As Single
        
        Randomize
    
        sngNumber = 2000001 * Rnd + 1000000
    
    End Function

  2. #2
    ridders52's Avatar
    ridders52 is offline Voodoo Is Practised
    Windows 10 Access 2010 32bit
    Join Date
    Jan 2014
    Location
    Somerset, UK
    Posts
    2,166
    I had to read this several times before (hopefully) understanding it.
    I think you are talking about several users each running their own copy of the FE.
    If so, I suggest you scrap your randomise idea and do it differently.

    Run a scheduled task from the server to compact the BE at a time when nobody is using it e.g. 02:00.

    Or if that's no good for your situation, add a field which stores when the BE was last compacted.
    When the FE is opened, the field value is checked.
    If the date is not the current date, run the compact and reset the date. Otherwise exit that code.

    It is not a good idea to have other users login whilst compacting is being run.
    Colin (Mendip Data Systems), Website, email
    If this has helped, please click the star button and leave a comment
    nil illegitimi carborundum est

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