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
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.
>>"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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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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- Edited by Shanky_621MVP, Moderator Tuesday, March 21, 2017 6:54 AM