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Description:
This wait type is when a thread has issued a RECEIVE WAITFOR on a Service Broker queue and is waiting for a message to enter the queue. This wait could be for a very long time if no message is transmitted on the Service Broker conversation.
(Books Online description: “Occurs when the RECEIVE WAITFOR is waiting. This is typical if no messages are ready to be received.”)
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Added in SQL Server version:
Pre-2005/2005
Removed in SQL Server version:
N/A
Extended Events wait_type value:
The map_key value in sys.dm_xe_map_values is 117 in 2008 and 2008 R2, and 121 in 2012 and 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. This wait type is one that I usually filter out as a benign wait when doing wait statistics analysis, as the thread will wait until a new message enters the queue, which may be a very long time.
Known occurrences in SQL Server (list number matches call stack list):
- Waiting for a message to enter a Service Broker queue
Abbreviated call stacks (list number matches known occurrences list):
- SOS_Task::PostWait+4d
EventInternal<Spinlock<153,1,0> >::Wait+1b2
CBrokerWaitFor::ReceiveWaitFor+e0
CBrokerQueryNotification::Wait+37
CXStmtQuery::WaitForResults+43
CXStmtDML::XretDMLExecute+405
CXStmtReceive::ExecuteWaitFor+12e
CXStmtReceive::XretExecute+174
CMsqlExecContext::ExecuteStmts<1,1>+375
CMsqlExecContext::FExecute+97e
CSQLSource::Execute+7b5