Proper Use Of Event Notifications

Apr 19, 2006

Hi.

I'm developing an app that uses Service Broker queues to allow a customer to create "events" that fire using a timer or a query notification. When these events fire, a message is sent to a Service Broker queue for processing. Because there is much managed code involved in processing these messages, I decided to use the External Activator application and an Event Notification to process these messages. My question is "what is the difference between using the External Activator application to launch another application (which simply RECEIVEs a message from the target queue and processes it) and creating a windows service that simply monitors the target queue (with a WAITFOR = -1 clause) and processes it?"

I guess I'm not sure how using the QUEUE_ACTIVATION Event Notification is really helping me.

Thanks,

Chris

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Sep 30, 2005

hi. can't seem to find the event notifications in the service broker folder of Management Studio..  I can get the information from sys.event_notifications, but it seems odd that event notifications are not in the UI. Hopefully I'm looking in the wrong place?

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Feb 20, 2008

I'm looking for a sanity check. Service broker and Event Notifications are new to me, so it is possible I'm either abusing or incorrectly using the technology. I'm experimenting with using Event Notifications and Server Broker to log error messages. The process works pretty well as long as I don't do something stupid such as stressing the process by calling raiserror in a loop of a 100000 - twice. It processed for a while, but eventual either SQL Server terminates (sev 25) or I had to force the SQL service to stop by killing it's process via task manager. I could not connect to SQL Server or stop the service normally.

I have several general questions. I think they are good questions. Any thoughts or suggestions would be appreciated.

1) I'm looking into generating deadlock and blocking email alerts. It appears that Event Notification is the way to go since there are very few events and I can respond to the event with an email. Is there a better method to automate blocking and deadlock email alerts that include event details?

2) If I wanted to retain some history of errors for the developers, should Event Notifications be avoided if a high number of errors can be generated by a badly formed T-SQL? Avoid TRC_ERRORS_AND_WARNINGS and USER_ERROR_MESSAGE? (I could tell the developers not to be stupid, but why would that stop them if it does not stop me?)

3) Is there a way to efficiently filter a Event Notification from entering the queue before the Receive statement is called? I get some events that I throw away after receiving them. For example, perhaps I want all events from all non-system databases without having to add a notification for each single non-system database. Or I want all errors with severity 11-17 only?

4) Is there a trick to filter out events from the procedure activated by the event. I tried using raiserror to debug a procedure without thinking. The result was that the queue never was empty because the processing produced more events to process. As a result, I don't use raiserror and use a try-catch to avoid raising errors in the procedure activated.

5) I can receive one message at a time using local variables or receive a batch of messages using a local table. Is a small batch the best way even if there is memory pressure?

6) In the activated procedure I continue processing in a loop until there are no more messages. This seems to be the most efficient. Is this always the case? Should I exit the procedure after a set number (large) of messages have been received? The procedure would activate again to continue processing?

7) Is there any point to using the MAX_QUEUE_READERS setting when processing event notifications? Should it be 1?

8) I currently get the next conversation group id and process its messages within a transaction. Is this a bad idea with event notifications? Should I just call Receive and get the next batch? I don't really care if I lose some messages if things are going badly. Should I avoid wrapping the receive in a transaction?

9) I could run a trace that starts with SQL Server; however, I think my only choice is to log to a file. Is there a way to trace to a table using SQLTrace without running profiler? I would like to automate the process and have the data in a table so that it can be easily queried and parsed for each database/team.

10) Is there a way to fix my process and handle 100000 messages a minute? Is there a way to skip messages when it gets to busy? Can the query generating the messages get throttled - perhaps along with the query designer - before the server gets into trouble? Query the memory used by a queue and drop/create the queue with a delay if there is an issue?

I'm using a single CPU test machine with only 1 GB and 2 GB pagefile and a single disk. OS: Windows 2003 R2 SP2. SQL: 9.0.3054 and on 9.0.3228 (update package 6 just came out today). I could add memory, but I think that would just permit me to queue more message before running into trouble.
I'll add code shortly - length limit.

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May 10, 2006

Hi!



Just set up my first Service Broker test. Wanted to send an Event Notification from one instance to another. Finally, the message arrives but profiler shows that the message is still being continously resent (and rejected as being duplicate). What am I doing wrong?



With best regards,

Artus

--

/* Local Event Source.sql */

USE master
GO

CREATE DATABASE NotificationDB
GO

ALTER DATABASE NotificationDB SET ENABLE_BROKER WITH ROLLBACK IMMEDIATE;
GO

CREATE ENDPOINT BrokerEndpoint
STATE = STARTED
AS TCP
(
LISTENER_PORT = 5554
)
FOR SERVICE_BROKER
(
AUTHENTICATION = WINDOWS,
ENCRYPTION = DISABLED
)
GO

USE NotificationDB
GO

CREATE EVENT NOTIFICATION TestEN
ON DATABASE
FOR CREATE_TABLE
TO SERVICE 'ExpressService', 'AFEDD339-AD3D-4865-AF3C-299B0A0784C6'
GO

CREATE ROUTE ExpressRoute
WITH SERVICE_NAME = 'ExpressService' ,
BROKER_INSTANCE = 'AFEDD339-AD3D-4865-AF3C-299B0A0784C6',
ADDRESS = 'TCP://localhost:5555'
GO

CREATE MASTER KEY ENCRYPTION BY PASSWORD = 'Pa$$w0rd';
GO

ALTER MASTER KEY ADD ENCRYPTION BY SERVICE MASTER KEY;
GO

USE master
GO

SELECT service_broker_guid FROM sys.databases WHERE database_id = DB_ID()
GO




/* Remote Service.sql */

USE master
GO

CREATE DATABASE Test
GO

ALTER DATABASE Test SET ENABLE_BROKER WITH ROLLBACK IMMEDIATE;
GO

CREATE ENDPOINT BrokerEndpoint
STATE = STARTED
AS TCP
(
LISTENER_PORT = 5555
)
FOR SERVICE_BROKER
(
AUTHENTICATION = WINDOWS,
ENCRYPTION = DISABLED
)
GO

USE Test
GO

CREATE QUEUE ExpressQueue
WITH STATUS = ON
GO

CREATE SERVICE ExpressService
ON QUEUE ExpressQueue
(
[http://schemas.microsoft.com/SQL/Notifications/PostEventNotification]
);
GO

GRANT SEND ON SERVICE::ExpressService
TO [public]
GO

CREATE ROUTE ExpressServiceRoute
WITH SERVICE_NAME = 'ExpressService',
BROKER_INSTANCE = 'AFEDD339-AD3D-4865-AF3C-299B0A0784C6',
ADDRESS = 'LOCAL'
GO

CREATE MASTER KEY ENCRYPTION BY PASSWORD = 'Pa$$w0rd';
GO

ALTER MASTER KEY ADD ENCRYPTION BY SERVICE MASTER KEY;
GO

SELECT service_broker_guid FROM sys.databases WHERE database_id = DB_ID()
GO

SELECT * FROM sys.endpoints
GO

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Date  10/25/2011 10:55:46 AM
Log  SQL Server (Current - 10/25/2011 10:55:00 AM)
Source  spid
Message
Event Tracing for Windows failed to send an event. Send failures with the same error code may not be reported in the future. Error ID: 0, Event class ID: 54, Cause: (null).
 
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We fixed one issue, but it brought up another. the fix we applied stopped the ServicesActive access failure, but now we have a failure on MSSEARCH. The users this is affecting do NOT have admin rights on the machine, they are SQL developers.
We were having

Event Type: Failure Audit
Event Source: Security
Event Category: Object AccessEvent ID: 560
Date: 5/23/2007
Time: 6:27:15 AM
User: domainuser
Computer: MACHINENAME
Description:
Object Open:
Object Server: SC Manager
Object Type: SC_MANAGER OBJECT
Object Name: ServicesActive
Handle ID: -
Operation ID: {0,1623975729}
Process ID: 840
Image File Name: C:WINDOWSsystem32services.exe
Primary User Name: MACHINE$
Primary Domain: Domain
Primary Logon ID: (0x0,0x3E7)
Client User Name: User
Client Domain: Domain
Client Logon ID: (0x0,0x6097C608)
Accesses: READ_CONTROL
Connect to service controller
Enumerate services
Query service database lock state

Privileges: -
Restricted Sid Count: 0
Access Mask: 0x20015



Applied the following fix

http://support.microsoft.com/kb/907460/


Now we are getting



Event Type: Failure Audit
Event Source: Security
Event Category: Object Access
Event ID: 560
Date: 5/23/2007
Time: 10:51:23 AM
User: domainuser
Computer: MACHINE
Description:
Object Open:
Object Server: SC Manager
Object Type: SERVICE OBJECT
Object Name: MSSEARCH
Handle ID: -
Operation ID: {0,1627659603}
Process ID: 840
Image File Name: C:WINDOWSsystem32services.exe
Primary User Name: MACHINE$
Primary Domain: domain
Primary Logon ID: (0x0,0x3E7)
Client User Name: user
Client Domain: domain
Client Logon ID: (0x0,0x60D37C1A)
Accesses: READ_CONTROL
Query service configuration information
Query status of service
Enumerate dependencies of service
Query information from service
Privileges: - Restricted Sid Count: 0 Access Mask: 0x2008D

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Thanks,

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2. SQL Server AGent
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I'm beginer with service brooker and i wandering if someone could help me to clarify what would be the proper usage of service broker for my current situation...



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Any help would be really appreciated







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All,



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