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This wait type is when a thread switches to preemptive mode as part of querying the state of a session target.
(Books Online description: N/A)
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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 541 in 2008 and 2008 R2, 589 in 2012, and 605 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):
- Getting the target state (in this case, as part of a query involving the sys.fn_xe_file_target_read_file function)
And other similar call stacks.
Abbreviated call stacks (list number matches known occurrences list):