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This wait type is where a thread has switched to preemptive mode to perform rollback of a FILESTREAM operation on the file system.
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Added in SQL Server version:
Removed in SQL Server version:
Extended Events wait_type value:
Maps to the PREEMPTIVE_FSRECOVER_CONDITIONALUNDO¬ 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 516¬†in 2008 and 2008 R2, 564¬†in 2012, and 580¬†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 to be a noticeable contention point.
Known occurrences in SQL Server (list number matches call stack list):
- Rolling back a FILESTREAM operation (in this case, as part of rolling back the insertion of a row that contains FILESTREAM data)
Abbreviated call stacks (list number matches known occurrences list):