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Exactly as the description below states.
(Books Online description: “Occurs while CLR waits for an application domain to complete startup.”)
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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 223 in 2008 and 2008 R2, 230 in 2012, and 237 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 an application domain to load (in this case, while parsing/algebrizing a query that involves a user-defined function)
And other similar call stacks.
Abbreviated call stacks (list number matches known occurrences list):