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Description:
This wait type is when a thread is sleeping between checks for SQL Trace information to flush out to a trace file.
(Books Online description: N/A)
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Added in SQL Server version:
2008 R2
Removed in SQL Server version:
N/A
Extended Events wait_type value:
The map_key value in sys.dm_xe_map_values is 162 in 2008 R2, and 166 in 2012 and 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.
Other information:
I have not seen this wait type be a noticeable contention point.
This wait type is one that I usually filter out as a benign wait when doing wait statistics analysis.
Known occurrences in SQL Server (list number matches call stack list):
- Sleeping between checks for SQL Trace information to flush
Abbreviated call stacks (list number matches known occurrences list):
- SOS_Task::PostWait+9e
EventInternal<SuspendQueueSLock>::Wait+25e
CTraceManagementTask::Invoke+ee
CTraceBatchTask::Task+25c
SOS_Task::Param::Execute+21e
SOS_Scheduler::RunTask+ab