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Description:
This wait type is when a thread is waiting for a write to a trace file to complete.
(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 600 in 2008 R2, 682 in 2012, and 700 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.
Other information:
I have not seen this wait type be a noticeable contention point, but I suppose these waits may become longer if there is I/O subsystem contention.
Known occurrences in SQL Server (list number matches call stack list):
- Waiting for a write to a trace file to complete
And other similar call stacks.
Abbreviated call stacks (list number matches known occurrences list):
- SOS_Task::PostWait+90
EventInternal<SuspendQueueSLock>::Wait+1f9
CTraceFileIoProvider::WriteHeader+1db
CTraceFileIoProvider::OpenNextFile+74
CTraceWriteRequest::InitForFileTrace+154
CTraceFileIoProvider::InitializeWriteRequest+29
CTrace::WriteRecord+74e
CTraceController::ProduceRecord+706
CQScanSortNew::TransitionToOutputPhase+187
CQScanSortNew::PushClose+36
CQScanSortNew::BuildSortTable+2ec
CQScanSortNew::OpenHelper+c0
CQScanNew::OpenHelper+41
CQScanXProducerNew::Open+c8
FnProducerOpen+44
FnProducerThread+851
SubprocEntrypoint+a59
SOS_Task::Param::Execute+21e
SOS_Scheduler::RunTask+a8