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Unknown, but I’m guessing from the call stacks that this wait type occurs during SQL Server startup for some background tasks while they initialize, for instance the SQL OS resource monitor (see Jonathan’s post here for more information).
(There is no Books Online description for this wait type.)
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Added in SQL Server version:
Removed in SQL Server version:
Extended Events wait_type value:
Maps to the ALL_COMPONENTS_INITIALIZED¬ map_value¬†in¬ sys.dm_xe_map_values¬ (thanks to Jonathan’s post¬ here).
The¬ map_key¬†value in¬ sys.dm_xe_map_values¬ is 733¬†in 2012 and 751¬†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.
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 the SQL OS resource monitor to initialize
- Waiting for the Extended Events subsystem to initialize
Abbreviated call stacks (list number matches known occurrences list):