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Exactly as the description below states.
(Books Online description: “Occurs while waiting for access to the loaded assembly list in the appdomain.”)
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Added in SQL Server version:
Removed in SQL Server version:
Extended Events wait_type value:
The map_key value in sys.dm_xe_map_values is 224 in 2008 and 2008 R2, 231 in 2012, and 238 in 2014 RTM. After 2014 RTM, you must check the DMV to get the latest value as some map_key values have changed in later builds.
I have not seen this wait type be a noticeable contention point.
Known occurrences in SQL Server (list number matches call stack list):
- Waiting for access to the loaded assemblies list (in this case, while retrieving the information about a user-defined type while creating a TDS buffer)
And other similar call stacks.
Abbreviated call stacks (list number matches known occurrences list):