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This wait type is when a thread is waiting for a Service Broker event to happen.
(Books Online description: “Occurs when a task is waiting in the primary event handler of the Service Broker. This should occur very briefly.”)
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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 174 in 2008 and 2008 R2, and 178 in 2012 and 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.
This wait type is one that I usually filter out as a benign wait when doing wait statistics analysis.
Known occurrences in SQL Server (list number matches call stack list):
- Waiting for a Service Broker event to happen
Abbreviated call stacks (list number matches known occurrences list):