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(Books Online description: “Used internally by SQL Server to initialize the synchronization of the creation of an allocation ring buffer.”)
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Added in SQL Server version:
Removed in SQL Server version:
Extended Events latch_class value:
Maps to the ALLOC_RINGBUF_CREATE map_value in sys.dm_xe_map_values.
The map_key value in sys.dm_xe_map_values is 1 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):