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This wait type occurs when a thread is waiting for access to a profile list as part of the query profile statistics mechanism.
(Books Online description: “Internal use only.”)
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Added in SQL Server version:
2016 (unknown SP/CU)
Removed in SQL Server version:
Extended Events wait_type value:
The map_key value in sys.dm_xe_map_values is 1189 in 2017 RTM. For other builds, you must check the DMV to get the latest value as some map_key values change.
There is a known issue in SQL Server 2016 and 2017 where this wait type can be the source of a hang when using trace flag 7412 (to allow capturing metrics without the need for the execution plan, which is expensive) – see KB 4089239.
Known occurrences in SQL Server (list number matches call stack list):
Abbreviated call stacks (list number matches known occurrences list):