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XE_FILE_TARGET_TVF

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Description:

This wait type is when a thread is waiting for data to be returned when using the sys.fn_xe_file_target_read_file table-value function to read event data from a file target.

(Books Online description: N/A)

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Added in SQL Server version:

2016

Removed in SQL Server version:

N/A

Extended Events wait_type value:

The map_key value in sys.dm_xe_map_values is 1094 in 2016 RTM. After 2016 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 event data from the sys.fn_xe_file_target_read_file table-value function during a query

And other similar call stacks for operations with that TVF.

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

  1. SOS_Task::PopWait+0xb4
    XE_FileTargetTVF::InternalGetRow+0x26a
    CQScanTVFStreamNew::GetRow+0xd6
    CQScanSortNew::BuildSortTable+0x266
    CQScanSortNew::OpenHelper+0xbc
    CQScanNLJoinNew::Open+0x27
    CQScanNLJoinNew::Open+0x27
    CQueryScan::StartupQuery+0x2a7
    CXStmtQuery::SetupQueryScanAndExpression+0x33e
    CXStmtQuery::InitForExecute+0x34
    CXStmtQuery::ErsqExecuteQuery+0x4df
    CXStmtSelect::XretExecute+0x322
    CMsqlExecContext::ExecuteStmts<1,1>+0x40d
    CMsqlExecContext::FExecute+0xa9e
    CSQLSource::Execute+0x981
    process_request+0xe61
    process_commands_internal+0x2df
    process_messages+0x253
    SOS_Task::Param::Execute+0x231
    SOS_Scheduler::RunTask+0xaa