(Republishing, or using this info in a commercial product/website, is prohibited without permission. All other uses are permitted. If in doubt, please ask.)

SQLTRACE_PENDING_BUFFER_WRITERS

(Back to main page…)

Description:

This wait type is when a thread is waiting for a SQL Trace buffer writer to write a buffer to a trace file.

(Books Online description: N/A)

Questions/comments on this wait type? Click here to send Paul an email, especially if you have any information to add to this topic.

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 602 in 2008 R2, 684 in 2012, and 702 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. Waiting for a SQL Trace buffer to be written to a file

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

  1. SOS_Task::PostWait+90
    EventInternal<SuspendQueueSLock>::Wait+1f9
    CTraceIoBuf::IncrementalFlush+122
    CTraceFileIoProvider::IncrementalFlush+70
    CTraceController::IncrementalFlush+14e
    CRowsetTraceTable::OpenNextFile+114
    CRowsetTraceTable::GetRowImpl+2b0
    CRowsetTraceTable::GetRow+23
    CQScanTVFStreamNew::GetRow+d5
    CQScanFilterNew::GetRowHelper+20
    CQueryScan::GetRow+81
    CXStmtQuery::ErsqExecuteQuery+54a
    CXStmtSelect::XretExecute+2f7
    CMsqlExecContext::ExecuteStmts<1,1>+400
    CMsqlExecContext::FExecute+a33
    CSQLSource::Execute+866
    process_request+73c
    process_commands+51c
    SOS_Task::Param::Execute+21e
    SOS_Scheduler::RunTask+a8