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This wait type is when a thread is waiting for other threads involved in the sort during an offline index build to finish processing.
(Books Online description: “Occurs in certain cases when offline create index build is run in parallel, and the different worker threads that are sorting synchronize access to the sort files.”)
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Added in SQL Server version:
Removed in SQL Server version:
Extended Events wait_type value:
Maps to the QUERY_EXEC_INDEXSORT_OPEN 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 286 in 2008 and 2008 R2, 292 in 2012, and 299 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):
- Waiting for other threads to finish the sort during an offline index build
Abbreviated call stacks (list number matches known occurrences list):