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(Books Online description: “Occurs during internal synchronization in the SQL Server memory manager.”)
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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 123 in 2008 and 2008 R2.
Known occurrences in SQL Server (list number matches call stack list):
Abbreviated call stacks (list number matches known occurrences list):