Many threads opened on this topic, none seem to have an answer for my problem so i am going to give it a try..
System : Windows Server 2012 SQL Server 2012 Enterprise edition
Problem : We are using SQLDependency to enable use of query notification in our application which means it creates its own service , queue and procedure.
Question 1: Looking in the stored procedure i see it does receive top 0. What does it mean to do top 0?
Now for the real problem.. Occasionally , the error log is filled with the following messages (to the point when i cant open it) : Query notification delivery could not send message on dialog 'X'.... because of the following error in service broker: 'The conversation handle X is not found. The messages appear with the same conversation_handle or 3 different the most.
when i query that conversation from sys.conversation_endpoints , i do see it and it is marked as is_system = 1 (STARTED_OUTBOUND).
I've added an alert on error 9245 to try and identify why it happens when it happens. In the message 'During the last time interval X query notification errors were suppressed' , the X is enormous and more than 10,000. i guess the number is related to retrials because we dont have such a number of notifications.
At first, i thought it might be related with the 'DialogTimer' message because i noticed that when i end the conversation of that specific message , the messages stop but recently it didnt work so the only think i could do to stop it is set NEW_BROKER.
it immediately happen when i do recycle to our application pool although i see in our logs it calls the SQLDependency.Stop , i dont see the objects (service,queue and procedure) dropped and the error messages start flooding the error log.
Please let me know if further details are required. Appreciate your help,
Thanks
Doron
DB