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How many concurrent users against SQL

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  • DaveM
    replied
    Re: How many concurrent users against SQL

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

    .

    Leave a comment:


  • Bill Parker
    replied
    Re: How many concurrent users against SQL

    Dave,

    The first link on SQL server limits was quite interesting.

    Bill.

    Leave a comment:


  • Bill Parker
    replied
    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.

    Bill.

    Leave a comment:


  • DaveM
    replied
    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 "http://wiki.postgresql.org/wiki/Runn...Native_Windows"

    Leave a comment:


  • DaveM
    replied
    Re: How many concurrent users against SQL

    Bill,

    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
    http://publib.boulder.ibm.com/infoce...n/r0001029.htm

    and here:
    http://forums.microsoft.com/MSDN/Sho...57425&SiteID=1
    This one can lead you to more.
    .
    Last edited by DaveM; 09-19-2008, 08:52 PM.

    Leave a comment:


  • Bill Parker
    started a topic How many concurrent users against SQL

    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.

    Bill.
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