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How many concurrent users against SQL

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  • How many concurrent users against SQL

    For apps developed with active link tables against (particularly) MS SQL Server, I am curoius how many concurrent users anyone has. I am going to do a presentation on Alpha to and Access group and this seems like a useful piece of info to have.


  • #2
    Re: How many concurrent users against SQL


    I am dumb on the subject and would double check whatever I think, but isn't sql without limits on users? I think the limit is going to have to do with the server nodes? I believe I read the size of the files could be a problem depending on which version of sql you use.

    I will watch this thread because it is something I may cross soon also.

    look here

    and here:
    This one can lead you to more.
    Last edited by DaveM; 09-19-2008, 08:52 PM.
    Dave Mason
    [email protected]
    Skype is dave.mason46


    • #3
      Re: How many concurrent users against SQL

      This is interesting
      cannot run with more than about 125 connections at once, despite having capable hardware
      When running as a service, you may experience failures with more than approximately 125 simultaneous connections. This can happen because some of the libraries that PostgreSQL is dependent on are dependent on user32.dll which allocates memory from an area known as the Desktop Heap. The desktop heap is assigned to each logon session, with non-interactive sessions typically being assigned 512KB. Each postgres process that runs typically consumes approximately 3.2KB of desktop heap, which coupled with other overhead can exhaust the allocated heap at somewhere around 125 connections. This doesn't happen when running from the command line (or more precisely, happens with much higher numbers of connections) because the interactive logon session is typically allocated 3MB of Desktop Heap.
      You can increase the non-interactive Desktop Heap by modifying the third SharedSection value in the registry as described in this Microsoft Knowledgebase article. Note that this should be done with great care as specifying a value that is excessively high may prevent your system from booting.
      Retrieved from ""
      Dave Mason
      [email protected]
      Skype is dave.mason46


      • #4
        Re: How many concurrent users against SQL

        I asked because I heard from someone today that is doing an Access / SQL Server application. Ultimately they are doing all the backend connections with unbound forms and obviously it has been a lot of work.

        I don't think there would be any limitations on SQL Server itself, but curious if any performance or concurrency issues show up when doing the linking through the Alpha active link dbf table.



        • #5
          Re: How many concurrent users against SQL


          The first link on SQL server limits was quite interesting.



          • #6
            Re: How many concurrent users against SQL

            Do a search in google, you my find a lot more.

            Dave Mason
            [email protected]
            Skype is dave.mason46