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(Books Online description: “Occurs when there is a wait by the FILESTREAM garbage collector to do either of the following: 1) Disable garbage collection (used by backup and restore). 2) Execute one cycle of the FILESTREAM garbage collector.)
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Added in SQL Server version:
Removed in SQL Server version:
Extended Events wait_type value:
Maps to the FS_GC_ROWLOCK 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 358 in 2008 and 2008 R2, 405 in 2012, and 421 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.
Known occurrences in SQL Server (list number matches call stack list):
Abbreviated call stacks (list number matches known occurrences list):