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(Books Online description: “Occurs during internal synchronization in metadata cache along with iterating index or stats in a table.”)
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Added in SQL Server version:
Removed in SQL Server version:
Extended Events wait_type value:
Maps to the METADATA_LAZYCACHE_RWLOCK 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 642 in 2012 and 658 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 previously was METADATA_LAZYCACHE_ROWLOCK 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):