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BROKER_TRANSMISSION_TABLE

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Description:

This wait type is when a thread is waiting for the writing out of inactive transmission objects (that track message transmissions for a dialog) to a tempdb worktable to save memory. See the Service Broker Transmission Objects section of Books Online here for more information.

(Books Online description: “N/A”)

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Added in SQL Server version:

2012

Removed in SQL Server version:

N/A

Extended Events wait_type value:

The map_key value in sys.dm_xe_map_values is 688 in 2012 and 706 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 inactive transmission objects to be flushed to tempdb

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

  1. SOS_Task::PostWait+9e
    EventInternal<SuspendQueueSLock>::Wait+2ca
    SOS_RWLock::GetLongWait+10b
    CSbTransmissionLazyFlusher::ProcessStandByList+29a
    CSbTransmissionLazyFlusher::LazyFlushTask+11d
    CSbTask::TaskStart+14b
    CSbTask::BeginTaskStart+17
    SOS_Task::Param::Execute+21e
    SOS_Scheduler::RunTask+a8