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This wait type seems to be a generic wait for background worker threads involved in in-memory table processing. Note that this is a preemptive wait, so the thread continues executing on the processor until the work is complete.
(Books Online description: “Internal use only.”)
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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 1065 in 2016 RTM. After 2016 RTM, you must check the DMV to get the latest value as some map_key values have changed in later builds.
Anecdotal evidence suggests that this wait type may become a bottleneck when using the Telemetry Extended Events session.
Known occurrences in SQL Server (list number matches call stack list):
- An in-memory background worker thread ending a period of running in preemptive mode.
And other similar call stacks.
Abbreviated call stacks (list number matches known occurrences list):