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This wait type is when a thread is waiting for an In-Memory OLTP operation that was started by the regular Engine.
(Books Online description: “Occurs when waits are triggered by the database engine and implemented by the host.”)
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Added in SQL Server version:
Removed in SQL Server version:
Extended Events wait_type value:
Maps to the XTP_HOST_WAIT map_value in sys.dm_xe_map_values.
The map_key value in sys.dm_xe_map_values is 896 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.
This wait type is one that I usually filter out as a benign wait when doing wait statistics analysis.
I have not seen this wait to be a noticeable contention point.
Known occurrences in SQL Server (list number matches call stack list):
- Waiting for an In-Memory OLTP wait to end (in this case, when shutting down an In-Memory OLTP process after a failure)
Abbreviated call stacks (list number matches known occurrences list):