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Editorial Team
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Asked: 2026-06-02T21:23:13+00:00

I’m working on a project with SqlDependencies attached to a big table… When these

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I’m working on a project with SqlDependencies attached to a big table…

When these dependencies are activated, I see in the SSMS activity monitor this kind of request in the Recent Expensive Queries:

WAITFOR(RECEIVE TOP (1) message_type_name, conversation_handle, cast(message_body AS XML) as message_body from [SqlQueryNotificationService-d1bd009f-3cb4-42af-85d8-38a4b15ca399]), TIMEOUT @p2;

And the average duration is close to 60s.

Is this normal ? Is this because there’s a worker thread behind ?

thanks.

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1 Answer

  1. Editorial Team

    Yes, that’s normal. SqlDependency uses the SQL Server queueing mechanisms internally.

    WAITFOR( RECEIVE ... ) is the SQL command used to wait for arriving messages on a queue in Sql Server.

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