XE_BUFFERMGR_ALLPROCESSED_EVENT

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Description:

Just as the description below states.

(Books Online description: “Occurs when Extended Events session buffers are flushed to targets. This wait occurs on a background thread.”)

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Added in SQL Server version:

2008

Removed in SQL Server version:

N/A

Extended Events wait_type value:

The map_key value in sys.dm_xe_map_values is 341 in 2008 and 2008 R2, 388 in 2012, and 404 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.

Known occurrences in SQL Server (list number matches call stack list):

1. Flushing all buffered events to targets for a session (in this case, flushing all buffered events from a session just before changes to the session are committed)
2. Flushing all buffered events to targets for a session (in this case, while flushing all events for all sessions as part of shutting down the instance)

Abbreviated call stacks (list number matches known occurrences list):

1. SOS_Task::PostWait+9e
   EventInternal<SuspendQueueSLock>::Wait+2ca
   XE_FlushRequest::Wait+e0
   XE_Session::Flush+152
   XE_Session::Commit+d2
   XE_Session::Close+205
   XE_Session::Destroy+33
   XE_Engine::ReleaseObjectReference+79
   XEventController::VLR_AlterXESession::~VLR_AlterXESession+77
   XEventController::VLR_StopXESession::CommitAndRelease+194
   XdesRMReadWrite::CommitAllVirtualLogRecs+e4
   XdesRMReadWrite::PreDestruct+23e
   XdesRMFull::~XdesRMFull+b2
   XdesRMFull::`vector deleting destructor’+14
   XactRM::SinglePhaseCommit+1e3
   XactRM::CommitInternal+472
   FullXactImp::Commit+33f
   CMsqlXactInternalReadWrite::Commit+19
   CMsqlXactImp::Commit+1d6
   CXStmtDDL::FinishNormalImp+e1
   CMsqlExecContext::ExecuteStmts<0,1>+9d8
2. SOS_Task::PostWait+9e
   EventInternal<SuspendQueueSLock>::Wait+2ca
   XE_FlushRequest::Wait+e0
   XE_Session::Flush+152
   XE_FlushSessions+17f
   FlushAllExtendedEventSessions+2e
   sqlservr.exe!SQLExitNoHangImpl+25
   sqlservr.exe!SQLExitImpl+68
   sqlservr.exe!SignalProc+26c
   StartUp::InitDBMS+169
   SOS_Task::Param::Execute+21e
   SOS_Scheduler::RunTask+a8