Query Notifications/ Service Broker Problem

Sep 11, 2006

Hey , I encountered a problem using SqlDependency and notification services.
I€™ve created a database with tools from c# Express 2005 and attached it to the sql server express 2005. And it turned out that €˜dependency_OnChange€™ in my application is triggered each time I execute the command.ExecuteReader(); and it shouldn€™t, because the command is just the select statement of columns and rows for which I wait to be modified.

SqlDependency dependency = new SqlDependency(command);
dependency.OnChange += new OnChangeEventHandler(dependency_OnChange);
command.ExecuteReader();//when the program gets here dependency_OnChange is called


So I Used the example from here :
http://msdn2.microsoft.com/en-us/library/a52dhwx7.aspx

and with AdventureWorks it behaves as it should , but when I change the connection string and select statement in the example to work with MyDatabase, the problem appears again.
So there is something wrong with MyDatabase ?

The select statement I used was €œselect Name, Pass from Users where Name like €˜L%€™€?;
So theoretically this should work but it does not and I end up in an infinite loop with
dependency_OnChange called cyclically €¦

I€™d be grateful for any advice !

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The SQL Server Service Broker For The Current Database Is Not Enabled, And As A Result Query Notifications Are Not Supported. Please Enable The Service Broker For This Database If You Wish To Use Notifications.

Feb 16, 2008

Hello,          I receive this error  "The SQL Server Service Broker for the current database is not enabled, and as a result query notifications are not supported.  Please enable the Service Broker for this database if you wish to use notifications." I attach the database in Management Studio to query and enable the broker using the scrip below but to no avail. ALTER DATABASE DataName SET ENABLE_BROKER ‘''<<------successfulandSELECT is_broker_enabled FROM sys.databases WHERE name = 'Database name' ‘'''<<-------value is 1 Global.asax ...    Sub Application_Start(ByVal sender As Object, ByVal e As EventArgs)        System.Data.SqlClient.SqlDependency.Start(ConfigurationManager.ConnectionStrings("dataConnectionString1").ConnectionString)    End Sub...Web.config ...    <connectionStrings>        <add name="dataConnectionString1" connectionString="Data Source=.SQLEXPRESS;AttachDbFilename=|DataDirectory|jbp_data.mdf;Integrated Security=True;User Instance=True"         providerName="System.Data.SqlClient" />        <add name="ASPNETDBConnectionString" connectionString="Data Source=.SQLEXPRESS;AttachDbFilename=|DataDirectory|ASPNETDB.MDF;Integrated Security=True;User Instance=True"         providerName="System.Data.SqlClient" />    </connectionStrings>... Hope you could help.  cheers,imperialx 

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Sep 10, 2007

How to prevent the hang on the initator service broker if the target service broker is not started?

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Query Distribution Using Service Broker

Mar 28, 2006

Hello ,

I am wokring on an application where in I am migrating the legacy application to SQL server. for this when ever I make any changes to the legacy application,I immediately move this changes to SQL, using insert/delete/update to SQL.

I also want all these data on 2 to 3 other SQL servers which are on different remote machines. for this i thought of using the service broker to send the query as messages.

So on the initiator(where the legacy application reside), i  create 2 to 3 queues(based upon number of receivers) and each time a query is successful on the initiator, i move these messages(queries) to the initiator queues and send them to the various targets. on the target i just pop these messages and execute them so that the query run on the all the targets and all my databases are in synch.

I need some info on various operations on the Service broker queues like:

1.How do i insert/update/delete from the queue.
2.Can i set some size constraint on the queue
3.Can i get the info like when the queue is full.
4.Can i set some custom flags on the queue like, queue is invalid or valid(setting and getting these falgvalues).
5.Clearing the entire queue.

These are the operations, i need on the queue for various use cases(failure cases)

Can you point to some documentation/tutorials whihc sheds more light on these queue operations.
Thanks,

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Error: Service Broker &&amp; SQL Query Notification Errors

Apr 13, 2006

My database is logging frequent errors and I am unable to determine the cause. These errors appear to be related to the Service Broker. Below is the database log file after a database restart and attempted access to the database through a web application. The first error (bottom of the logfile) is error 28054. I have searched on this error code and have found nothing helpful. Any assistance or direction would be greatly appreciated.

Database Log:

04/13/2006 12:26:05,spid22s,Unknown,An error occurred in the service broker message dispatcher<c/> Error: 15517 State: 1.
04/13/2006 12:26:05,spid22s,Unknown,Error: 9644<c/> Severity: 16<c/> State: 14.
04/13/2006 12:26:04,spid57s,Unknown,The activated proc [dbo].[SqlQueryNotificationStoredProcedure-aa148e0f-2980-4a23-b9cf-b44dbfddf783] running on queue CDR.dbo.SqlQueryNotificationService-aa148e0f-2980-4a23-b9cf-b44dbfddf783 output the following: 'Cannot execute as the database principal because the principal "dbo" does not exist<c/> this type of principal cannot be impersonated<c/> or you do not have permission.'
04/13/2006 12:26:01,spid22s,Unknown,An error occurred in the service broker message dispatcher<c/> Error: 15517 State: 1.
04/13/2006 12:26:01,spid22s,Unknown,Error: 9644<c/> Severity: 16<c/> State: 14.
04/13/2006 12:26:01,spid56s,Unknown,The activated proc [dbo].[SqlQueryNotificationStoredProcedure-aa148e0f-2980-4a23-b9cf-b44dbfddf783] running on queue CDR.dbo.SqlQueryNotificationService-aa148e0f-2980-4a23-b9cf-b44dbfddf783 output the following: 'Cannot execute as the database principal because the principal "dbo" does not exist<c/> this type of principal cannot be impersonated<c/> or you do not have permission.'
04/13/2006 12:26:01,spid56s,Unknown,The activated proc [dbo].[SqlQueryNotificationStoredProcedure-aa148e0f-2980-4a23-b9cf-b44dbfddf783] running on queue CDR.dbo.SqlQueryNotificationService-aa148e0f-2980-4a23-b9cf-b44dbfddf783 output the following: 'Cannot execute as the database principal because the principal "dbo" does not exist<c/> this type of principal cannot be impersonated<c/> or you do not have permission.'
04/13/2006 12:26:01,spid56s,Unknown,The activated proc [dbo].[SqlQueryNotificationStoredProcedure-aa148e0f-2980-4a23-b9cf-b44dbfddf783] running on queue CDR.dbo.SqlQueryNotificationService-aa148e0f-2980-4a23-b9cf-b44dbfddf783 output the following: 'Cannot execute as the database principal because the principal "dbo" does not exist<c/> this type of principal cannot be impersonated<c/> or you do not have permission.'
04/13/2006 12:26:01,spid52,Unknown,Service Broker needs to access the master key in the database 'CDR'. Error code:25. The master key has to exist and the service master key encryption is required.
04/13/2006 12:26:01,spid52,Unknown,Error: 28054<c/> Severity: 11<c/> State: 1.

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Mar 12, 2007

Hi,

SQL Server 2005 SP1. (+ 5 minutes fix installed).

Query notification subscription cretaed (sys.dm_qn_subscriptions).

Subscription does not fire in response to event.

sys.transmission_queue is empty.

profiler does not show errors.

sys.conversation_endpoints shows one endpoint in status SO. (along with a lot of left over garbage - about 300K records - but this should not be a problem other than storage).

I know SP2 is suppose to solve the garbage records problem but this is not our problem. This setup was working and then just stoped.

any ideas ?



Boaz

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Apr 5, 2007

Hi,



I am struggling with the position SSB could take in an SOA. If I would want a broker in the general sense, meaning an intermediary sitting between applications which exchange information through messaging, would SSB be a good candidate? I know Biztalk is probably the primary candidate, but in my scenario I would end up with Biztalk apps with empty orchestrations. Also, I think Biztalk is more expensive to manage. So I am looking for a lightweight broker for a simple SOA targeted at application interoperability, no fancy business processes in sight.



I look forward to some responses.



Kind regards,

Neeva

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Mar 30, 2007

I am trying to send a message between to SQL Server 2005 instances on two different machines. I have checked all my routes and all my objects appear to be setup correctly. However, when running Profiler on the target machine, I receive the "This message has been dropped because the TO service could not be found. Service name: "[tcp://mydomain.com/TARGET/MyService]". Message origin: "Transport". This is my activated stored procedure that is sending the message to the target service. I am using certificate security. Any help appreciated....



CREATE PROCEDURE [usp_ProcessMessage]

AS

BEGIN

SET NOCOUNT ON;

DECLARE @conversation_handle uniqueidentifier

DECLARE @message_body AS VARBINARY(MAX)

WHILE (1=1)

BEGIN

BEGIN TRANSACTION;

WAITFOR(RECEIVE TOP (1)

@conversation_handle = conversation_handle,

@message_body = message_body

FROM [tcp://mydomain.com/INITIATE/MyQueue]

), TIMEOUT 1000;

IF (@@ROWCOUNT = 0)

BEGIN

COMMIT;

BREAK;

END

END CONVERSATION @conversation_handle

IF @message_body IS NOT NULL

BEGIN



BEGIN DIALOG CONVERSATION @conversation_handle

FROM SERVICE [tcp://mydomain.com/INITIATE/MyService]

TO SERVICE '[tcp://mydomain.com/TARGET/MyService]'

ON CONTRACT [tcp://mydomain.com/INITIATE/MyMessage/v1.0]

WITH ENCRYPTION = ON, LIFETIME = 600;

SEND ON CONVERSATION @conversation_handle

MESSAGE TYPE [tcp://mydomain.com/TARGET/VisitMessage]

(@message_body);

END

COMMIT;

END

END

GO



My endpoints are created like so:



CREATE ENDPOINT MyEndpoint

STATE = STARTED

AS TCP

(

LISTENER_PORT = 4022

)

FOR SERVICE_BROKER (AUTHENTICATION = CERTIFICATE MasterCertificate)

GO



GRANT CONNECT TO CertOwner

GRANT CONNECT ON ENDPOINT::MyEndpoint TO CertOwner

GO



And my routes like so:



GRANT SEND ON SERVICE::[tcp://mydomain.com/INITIATE/MyService] TO CertOwner

GO

CREATE REMOTE SERVICE BINDING [MyCertificateBinding]

TO SERVICE '[tcp://mydomain.com/TARGET/MyService]'

WITH USER = CertOwner,

ANONYMOUS=OFF

CREATE ROUTE [tcp://mydomain.com/INITIATE/MyRoute]

WITH SERVICE_NAME = '[tcp://mydomain.com/TARGET/MyService]',

BROKER_INSTANCE = N'xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx',

ADDRESS = N'TCP://xxx.xx.xx.xx:4022'

GO

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Apr 13, 2006

Hi everybody
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Thank you
asa.:)

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May 10, 2006

Hi!



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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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I like the concept of Activation that Service Broker provides. But, from what I am reading most of the documentation describes activation as a way to call another stored proc. I definitely dont' want to do any process intensive work on the SQL server. So here comes my question...

How would I use a windows service to listen to the activation event from the Service Broker. I could have multiple windows services watching the same queue (scalable). Would I have to handle collisions myself? If so, I think I would rather keep it simple, and just use a simple table as my queue.

Thanks for your comments in advance...
Vijay.

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Jul 3, 2007

Hi all



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May 16, 2007

Hi,



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Thanks,

-paul

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VALIDATION = WELL_FORMED_XML;

CREATE CONTRACT MQContract
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CREATE QUEUE SentQueue
WITH
STATUS=ON, RETENTION=OFF;


CREATE QUEUE ReceivedQueue
WITH
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CREATE SERVICE SentService ON QUEUE SentQueue
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CREATE SERVICE ReceivedService ON QUEUE ReceivedQueue
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SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TRIGGER [dbo].[insertTrigger]
ON [dbo].[tblBBB] FOR INSERT AS
BEGIN
SET NOCOUNT ON;
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select @msgBody = someString from inserted

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FROM SERVICE SentService
TO SERVICE 'ReceivedService', 'CURRENT DATABASE'
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--Sends a message
SEND ON CONVERSATION @handle
MESSAGE TYPE SentMsgType
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END CONVERSATION @handle WITH CLEANUP;
END


SELECT * FROM SentQueue
SELECT * FROM ReceivedQueue;

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My
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Using the term
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Of
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Can the Service Broker provide me with this kind of functionality? If so, how well does it perform and scale? Is it a better choice for messaging applications that require high transactional throughput than MSMQ?

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Everything works fine!Cool!



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Mar 19, 2007

Hi,

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What do I do wrong?

Regards,

Manfred



create message type Preisanfrage
validation = well_formed_xml;

create message type PreisanfrageAntwort
validation = well_formed_xml;

create contract PreisanfrageContract
(
Preisanfrage sent by initiator,
PreisanfrageAntwort sent by target
);



create queue PreisanfrageRequestorQueue with
status=on;

create queue PreisanfrageQueue;



create service PreisanfrageRequestorService
on queue PreisanfrageRequestorQueue ( PreisanfrageContract );


create service PreisanfrageService
on queue PreisanfrageQueue (PreisanfrageContract );

create table debug_table;
create table debug_table (id int primary key identity(1,1), msg varchar(100));

create procedure PreisanfrageAction
as
declare @conversation uniqueidentifier
declare @msg nvarchar(max)
declare @msgType nvarchar(256)
declare @answer xml;

insert into debug_table(msg) values('1');

;receive top(1)
@conversation = conversation_handle,
@msg = message_body,
@msgType = message_type_name
from PreisanfrageQueue;

insert into debug_table(msg) values('2');

-- Preisanfrage bearbeiten


set @answer = '<preis>1</preis>';
;send on conversation @conversation
message type PreisanfrageAntwort (@answer);

end conversation @conversation;

insert into debug_table(msg) values('3');

alter queue PreisanfrageQueue
with
status=on,
activation (
status=on,
PROCEDURE_NAME = PreisanfrageAction,
max_queue_readers = 100,
EXECUTE AS OWNER
);




-- Dialog starten

declare @conversation uniqueidentifier;

begin dialog conversation @conversation
from service [PreisanfrageRequestorService]
to service 'PreisanfrageService'
on contract [PreisanfrageContract];

declare @request xml;

set @request = '<?xml version="1.0" encoding="UTF-8"?><Preisanfrage xmlns="4711101'">http://www.xyz.at/samples/Preisanfrage"><KundenId>4711</KundenId><ProduktId>10</ProduktId><Anzahl>1</Anzahl></Preisanfrage>';

;send on conversation @conversation
message type Preisanfrage ( @request );

receive * from PreisanfrageQueue;

receive * from PreisanfrageRequestorQueue;


select * from debug_table


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Feb 12, 2007

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I have come to the point where I need to get the messages that share a conversation with this BatchEnd message type before I get any other messages, as this message type tells me information about how many others there are.

I built this script and ran it in management studio with success and felt it should work for me running as the sql for an OLE DB source.

declare @ch uniqueidentifier;

select @ch = conversation_handle

from dm.[consultant queue]

where message_type_name = 'BatchEnd';

Receive conversation_handle, message_type_name, message_body

from dm.[consultant queue]

where conversation_handle = @ch;

But SSIS constantly complains about it. I finally profiled SSIS to catch the sql that it is executing. It is below and this fails with an error about a missing conversation_handle.


declare @p1 int

exec sp_prepare @p1 output,NULL,N'declare @ch uniqueidentifier;

select @ch = conversation_handle

from dm.[consultant queue]

where message_type_name = ''BatchEnd'';

Receive conversation_handle, message_type_name, message_body

from dm.[consultant queue]

where conversation_handle = @ch;',1

select @p1

go



Now I'm not sure which team may own this, but shouldn't this sp_prepare work. If I change this to use a table variable then the prepare seems to work just fine, but then I never actually get any data back into SSIS. It is almost like it calls it twice; although, I could not confirm that with profiler.

I'll cross post this in the Service Broker forum too.

Thanks!

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