Monitoring memory limit for SQL Server 2014 Express


  • Which perfmon counters or sys views should I monitor to see if I am getting close to Express edition's 1 GB limit?

    There is a plethora of ways to "count" SQL Server's memory usage, but it is unclear for me to which of these the 1 GB limit applies.

    Cross box scale limits just says this:

    "Maximum memory utilized (per instance of SQL Server Database Engine)": 1 GB

    For example, this:

    SELECT Type, Name, pages_kb, Virtual_Memory_reserved_kb, Virtual_Memory_committed_kb

    FROM   sys.dm_os_memory_clerks

    Provides 3 very different numbers for each clerk.

    I am asking because I am seeing "AppDomain unloaded due to memory pressure" errors when using the GEOMETRY type, but I am unsure if the instance is actually constrained by the 1 GB memory limit or if something else is going on.

    Monday, March 20, 2017 10:48 PM

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  • -> Check below articles,

    Vivek Janakiraman,

    Tuesday, March 21, 2017 1:40 AM
  • Hi Thomas,

    >>"Maximum memory utilized (per instance of SQL Server Database Engine)": 1 GB

    From what I can tell the 1GB limit applies to the buffer pool as described in this blog.

    >> AppDomain unloaded due to memory pressure

    Did you mean you are seeing things like ‘AppDomain 2046 (mssqlsystemresource.sys[runtime].5045) is marked for unload due to memory pressure. ‘ in SQL Server error log? From what I see, if you are not seeing this frequently, it should be safe to ignore. Otherwise I would suggest you review this kb article first.

    If you have any other questions, please let me know.


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    Tuesday, March 21, 2017 5:30 AM
  • Only One

    select * from sys.dm_os_process_memory

    It has two main columns

    1. physical_memory_in_use_kb--Gives you physical memory used by SQL Server

    2. virtual_address_space_committed_kb--Gives you total memory used RAM+Page file by SQL Server

    The first column is one you should look for memory utilization.

    Also note the limit is exactly not 1 GB, database engine can use more than 1 GB in express.

    Regarding appdomain yes you might be facing memory pressure 



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    Tuesday, March 21, 2017 6:53 AM