Event Notification On Disabled Queue: The Conversation Must End?
Jun 19, 2007
Hello,
I have configured an Event Notification for BROKER_QUEUE_DISABLED.
I created a Queue different from the one the Receive my normal messages and on this queue I define an activation.
The Activated SP takes the [EventNotification] message and execute a
RAISEERROR('Message',0,1) WITH LOG.
The error is properly logged in the SQL server event log but I gave a look the Initiator and target sys.conversation_endpoints catalog view and I have see the the conversations are in the status CONVERSING or SI ...
Do I have to call the END CONVERSATION after the commit or these statuses are caused by some mistakes on the message process workflow?
Thank you
Marina B.
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Jun 15, 2007
Hello,
I have almost finished to design my Service Broker application and I found out something strange.
I was tring to handle the Target queue disabled scenario, because I want to save to message that was not sent so I can create an alert to the user to say that some messages as not been sent.
To disable to queue I run:
Alter queue [dbo].[Receivedqueue] with status = off
I had the Event Viewer in front of me and I have seen the suddenly it appeared a lot of this informational events:
Event Type: Information
Event Source: MSSQLSERVER
Event Category: (2)
Event ID: 9724
Date: 15/06/2007
Time: 15:00:47
Description:
The activated proc [dbo].[OnReceived] running on queue TestReceiver.dbo.Receivedqueue output the following: 'The current transaction cannot be committed and cannot support operations that write to the log file. Roll back the transaction.'
For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.
What this message means?
I would like to avoid to have it because it appears a lot of time and I don't want to fill up my Event Viewer!!
I don't know of it is important but in the moment I executed the code there was not CONVERSING conversation and all the queues were empty.
Somebody has seen this error before or I have to send to the forum the [dbo].[OnReceived] code as well?
thankx
Marina B.
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Jan 21, 2008
Hi all -
I have an event in my sql server 2005 box that is fired every 5 seconds. Source MSSQLSERVER event ID 9274.
The activated proc [dbo].[sp_sysmail_activate] running on queue msdb.dbo.ExternalMailQueue output the following: 'The service queue "ExternalMailQueue" is currently disabled.'
I don't know anything about this queue that is mentioned above. How do I disable this message or get rid of that queue?
TIA
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Mar 25, 2006
Hi,
I receive messages in my target queue but target queue continously become disabled even aften I enable and receive message it still says target queue is disabled?
Please Guide
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Aug 31, 2006
When examining the "conversation_handle" column value in the Queue (from: "select * from ProcessQueue"), I find the value of the conversation_handle appears to be different from the "conversation handle" ("SEND ON CONVERSATION @conversationHandle...") on which the message was sent.
I'm trying to gather all messages for a given Dialog conversation, but am not able to do this because the conversation_handle doesn't appear consistent between messages in the Dialog.
note: the conversation_handle of "BEGIN CONVERSATION TIMER (@conversationHandle)..." message does appear to be correct in the Queue.
Thoughts on why the conversation_handle listed in the Queue might be different than that of the
"SEND ON CONVERSATION @conversationHandle..." command that sends the message?
-------------------------------------------------------------
-------------------------------------------------------------
-------------------------------------------------------------
ALTER PROCEDURE [dbo].[SendMessageStoredProcedure]
AS
-- Declare Conversation Handle
DECLARE @conversationHandle uniqueidentifier;
-- Declare Message
DECLARE @message nvarchar(max);
-- Begin Transaction
BEGIN TRANSACTION;
-- Begin Dialog from Service1 to Service2 on Contract
BEGIN DIALOG @conversationHandle
FROM SERVICE ExecuteProcess
TO SERVICE 'ExecuteProcess'
ON CONTRACT Process;
---
--- FROM DEBUGGER: @conversationHandle has value of AC8DF4E0-9F38-DB11-96A2-000CF1D46448
---
-- Set Message value
DECLARE @requestDocument xml
SET @requestDocument = N'<ProcessRequestMessage/>';
-- Start Converstation time
BEGIN CONVERSATION TIMER (@conversationHandle) TIMEOUT = @queueSeconds;
-- Send Message
SEND ON CONVERSATION @conversationHandle MESSAGE TYPE ProcessRequest (@requestDocument);
-- Commit Transaction
COMMIT TRANSACTION;
-------------------------------------------------------------
-------------------------------------------------------------
-------------------------------------------------------------
RESULTS OF: select * from ProcessQueue;
status priorty q_order conversation_group_id conversation_handle msg_s_# service_name ser_id srv_cont_name ...
1 0 1 AD8DF4E0-9F38-DB11-96A2-000CF1D46448 AC8DF4E0-9F38-DB11-96A2-000CF1D46448 -2 ExecuteProcess 65536 Process 65536 http://schemas.microsoft.com/SQL/ServiceBroker/DialogTimer 5 E NULL
1 0 0 AE8DF4E0-9F38-DB11-96A2-000CF1D46448 AF8DF4E0-9F38-DB11-96A2-000CF1D46448 0 ExecuteProcess 65536 Process 65536 ProcessRequest 65536 X 0xFFFE3C004400610074006100620...
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Jun 16, 2007
Hi was wondering whether it is possible to log somewhere outside SB that there are messages in the transmission_queue because the Target queue was disabled.
I was testing this scenario:
try to send messages on a disabled queue and log the problem.
But the transmission_status from the trasmission_queue is always empty.
This is the code that I tried to execute between the send and the commit and after the commit:
WHILE (1=1)
BEGIN
BEGIN DIALOG CONVERSATION .....
SEND ON CONVERSATION ......
if select count(*) from sys.transmission_queue <> 0
BEGIN
set @transmission_status = (select transmission_status from sys.transmission_queue where conversation_handle=@dialog_handle);
if @transmission_status = ''
--Successful send - Exit the LOOP
BEGIN
UPDATE Mytable set isReceivedSuccessfully = 1 where ID = @IDMessageXML;
BREAK;
END
ELSE
raiserror(@transmission_status,1,1) with log;
END
ELSE
BEGIN
UPDATE [dbo].[tblDumpMsg] set isReceivedSuccessfully = 1 where ID = @IDMessageXML;
BREAK;
END
END
COMMIT TRANSACTION;
As I wrote before the @transmission_status variable is always empty and I have the same result even if I put the code after the commit transaction!
Maybe what I'm trying to reach has no sense?
With the event notification I can notify when the queue is disable because the receive rollsback 5 times but what if by mistake the target queue is disabled outside the SB environment? I can I catch it and handle it properly?
Thank you!Marina B
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Jun 4, 2007
I use ALTER QUEUE statement to disable a Service Broker QUEUE then i see message -Service Queue is currently disabled every 5 sec in SQL server error Log. How can i stop this messages it is enought to see it only one time?
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Nov 16, 2005
Well I downloaded an example (HelloWorld) from www.SQLServiceBroker.com yesterday and it WAS working this morning, however; now I'm getting this error:
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Sep 17, 2007
I am using the Centralized Asynchronous Auditing with Service Broker article example to set up my first Service Broker attempt. We want to start logging search criteria and search results for our product search page. We wanted it to be asynchronous and be stored in another dbase, this seemed like the perfect example.
I modified the example above to save into an Audit table we created and to read a custom message that I generated the XML for. I'm pretty certain that should all work. However, I didn't change much else but I can't get the message to send.
This is the error I'm getting in profiler:
This message could not be delivered because the destination queue has been disabled. Queue ID: 197575742.
I am sending from one database to another within the same SQL server instance. Here are the profiler details
SQL:BatchStarting
EXEC dbo.usp_SendAuditData @X Microsoft SQL Server Management Studio - Query Larry APP1Larry
Broker:Conversation Group Microsoft SQL Server Management Studio - Query Larry
Broker:Conversation STARTED_OUTBOUND Microsoft SQL Server Management Studio - Query Larry
Broker:Conversation CONVERSING Microsoft SQL Server Management Studio - Query Larry
Broker:Message Classify Microsoft SQL Server Management Studio - Query Larry
Broker:Message Undeliverable This message could not be delivered because the destination queue has been disabled. Queue ID: 197575742. Microsoft SQL Server Management Studio - Query Larry APP1Larry
SQL:BatchCompleted
EXEC dbo.usp_SendAuditData @X Microsoft SQL Server Management Studio - Query Larry APP1Larry
Broker:Message Classify
Broker:Remote Message Acknowledgement
Broker:Remote Message Acknowledgement
Broker:Remote Message Acknowledgement
Broker:Message Classify
Broker:Message Undeliverable This message could not be delivered because the destination queue has been disabled. Queue ID: 197575742. sa
Broker:Message Undeliverable This message was dropped because it could not be dispatched on time. State: 2 sa
Broker:Message Undeliverable This message was dropped because it could not be dispatched on time. State: 2 sa
When I run SELECT * FROM sys.transmission_queue I get this in the transmission_status:
"One or more messages could not be delivered to the local service targeted by this dialog."
I'm hoping someone can point me in the right direciton, thanks.
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Aug 10, 2004
Does anyone know if there is any software available that notifies specified people when an error above a certian level occurs. Im thinking along the lines of email and text message.
Im running sql server 2k at sp3a level, and the software will have to be compatible with it so as to get the event notification to pass the information on.
If there isn't any software, would anyone know of any scripts that will do this?
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Aug 10, 2004
I am trying to set up the email notification system in SQL server 2000, but im having some problems. Mainly, im having problems with setting up an email account in the first place (there is a dedicated mail box, but the one im working with is a different box altogether).
If anyone could help fathom this out from start to finish i would be really grateful.
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May 21, 2006
Hi
I have a simple question regarding event notification in sql 2005. I keep up getting a message indicating a syntax error when trying to execute the following script. I also tried with [ instead of '.
CREATE EVENT NOTIFICATION NotifyCT
ON DATABASE
FOR CREATE_TABLE
TO SERVICE 'NotifyService'
Msg 102, Level 15, State 1, Line 4
Incorrect syntax near 'NotifyService'.
I cannot find any error in my syntax. Please help
Thanks
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Jan 30, 2006
Hello Remus,
I have implemented Event Notification sample you provided in my logic, but I am perplexed that even though my watched queue does go down, I do not get message in the Event_Collector queue all the time. The Event_Collector queue does stay enabled though. Any thoughts? I guess any suggestions on debugging the event notification portion would be helpful.
Lubomir
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Jul 23, 2005
I would like to propagate an event signal to an external applicationwhen a table in my MSSql2000 server is updated.Prog A; I have an external application adding records to a table.Prog B; I have another external application using this table as well.When Prog A creates a new record in the Table, how can I have Prog B benotified of the event without polling the table or creating a linkbetween Prog A and Prog B.Thanks.
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Apr 13, 2007
If I call ExecuteNonQuery() in a timer event callback in a console application, it hangs. Why is that?
.B ekiM
class Program
{
static SqlConnection conn = new SqlConnection("Integrated Security=SSPI;Persist Security Info=False;Initial Catalog=NONEOFYOURBISUINESS;Data Source=localhost");
static void Main(string[] args)
{
NativeMethods.MEMORYSTATUSEX mem = new NativeMethods.MEMORYSTATUSEX();
NativeMethods.GlobalMemoryStatusEx(mem);
Console.WriteLine("{0} bytes", mem.ullAvailPhys);
System.Timers.Timer aTimer = new System.Timers.Timer();
// Set the Interval to 2 seconds (2000 milliseconds).
aTimer.Interval = 1000;
aTimer.Enabled = true;
// Hook up the Elapsed event for the timer.
aTimer.Elapsed += new ElapsedEventHandler(OnTimedEvent);
Console.ReadLine();
}
private static void OnTimedEvent(object source, ElapsedEventArgs e)
{
NativeMethods.MEMORYSTATUSEX mem = new NativeMethods.MEMORYSTATUSEX();
NativeMethods.GlobalMemoryStatusEx(mem);
SqlCommand cmd = new SqlCommand(
"INSERT INTO Observation (StatisticType, StatisticObserved, StatisticValue) VALUES (1, @When, @AvailPhys);" +
"INSERT INTO Observation (StatisticType, StatisticObserved, StatisticValue) VALUES (2, @When, @AvailPageFile);" +
"INSERT INTO Observation (StatisticType, StatisticObserved, StatisticValue) VALUES (3, @When, @AvailVirtual);" +
"INSERT INTO Observation (StatisticType, StatisticObserved, StatisticValue) VALUES (4, @When, @AvailExtendedVirtual);");
DateTime dt = DateTime.Now;
cmd.Parameters.AddWithValue("AvailPhys", mem.ullAvailPhys);
cmd.Parameters.AddWithValue("AvailPageFile", mem.ullAvailPageFile);
cmd.Parameters.AddWithValue("AvailVirtual", mem.ullAvailVirtual);
cmd.Parameters.AddWithValue("AvailExtendedVirtual", mem.ullAvailExtendedVirtual);
cmd.Parameters.AddWithValue("When", dt);
cmd.ExecuteNonQuery();
Console.WriteLine("Inserted {0}", dt);
}
}
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Feb 21, 2007
Hello,
Can anyone spot what i am missing here ? The problem is that i am getting a null object for e.TextData in the t_OnEvent(object sender, TraceEventArgs e) function below. I am trying to get event- notifications while processing the data mining structure.
thanks
anil
//-------------code below-------------------------------------
using Microsoft.AnalysisServices;
private void ProcessMiningStructure(MiningStructure mStruct)
{
Trace t;
TraceEvent e;
t = server.Traces.Add();
e = t.Events.Add(TraceEventClass.ProgressReportCurrent);
e.Columns.Add(TraceColumn.TextData);
t.OnEvent += new TraceEventHandler(t_OnEvent);
t.Update();
try
{
t.Start();
mStruct.Process(ProcessType.ProcessFull);
t.Stop();
}
catch (Exception ex)
{
}
t.Drop();
}
//------------------------------------------------------
void t_OnEvent(object sender, TraceEventArgs e)
{
SetText(e.TextData);
}
//------------------------------------------------------
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Aug 20, 2007
Hi
I am unable to drop the above login. The error is Error:15141 The server principal owns an event notification and cannot be dropped.
I have looked in the table sys.server_event_notifications and there are rows returned that have a server_principal_id of the user I am trying to drop. No events have been created on this server, so I am assuming these notifications are either created by default or are somehow related to Database Mail?
All the event notifications belong to service name "SQL/Notifications/ProcessWMIEventProviderNotification/v1.0" and begin with SQLWEP (i.e. SQLWEP_RECHECK_SUBSCRIPTIONS, SQLWEP_B415ADB8_A604_4057_976F_600002FA5AF6). How can I find out what these are for and how they were created?
What purpose do these event notifications have? Is there some syntax to change the owner of these event notifications so I can successfully drop the login? If the only way is to directly update the system view, is this safe and what repercussions could this have?
Thanks
Martin
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Dec 3, 2007
Hi
I'm using service broker and keep getting errors in the log even though everythig is working as expected
SQL Server 2005
Two databases
Two end points - 1 in each database
Two stored procedures:
SP1 is activated when a message enters the sending queue. it insert a new row in a table
SP2 is activated when a response is sent from the receiving queue. it cleans up the sending queue.
I have a table with an update trigger
In that trigger, if the updted row meets a certain condition a dialogue is created and a message is sent to the sending queue.
I know that SP1 and SP2 are behaving properly because i get the expected result.
Sp1 is inserteding the expected data in the table
SP2 is cleaning up the sending queue.
In the Sql Server log however i'm getting errors on both of the stored procs.
error #1
The activated proc <SP 1 Name> running on queue Applications.dbo.ffreceiverQueue output the following: 'The conversation handle is missing. Specify a conversation handle.'
error #2
The activated proc <SP 2 Name> running on queue ADAPT_APP.dbo.ffsenderQueue output the following: 'The conversation handle is missing. Specify a conversation handle.'
I would appreceiate anybody's help into why i'm getting this. have i set up the stored procs in correctly?
i can provide code of the stored procs if that helps.
thanks.
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Jan 11, 2006
Hello,
This is info that I am still not certain about and I just need to make sure, my gut feeling is correct:
A.
When a procedure is triggered upon reception of a message in a queue, what happens when the procedure fails and rolls back?
1. Message is left on the Queue.
2. is the worker procedure triggered again for the same message by the queue?
3. I am hoping the Queue keeps on triggering workers until it is empty.
My scenario is that my queue reader procedure only reads one message at a time, thus I do not loop to receive many messages.
B.
For my scenario messages are independent and ordering does not matter.
Thus I want to ensure my Queue reader procedures execute simultaneously. Is reading the Top message in one reader somehow blocking the queue for any other reader procedures? I.e. if I have BEGIN TRANSACTION when reading messages of the Queue, is that effectively going prevent many reader procedures working simultaneously. Again, I want to ensure that Service broker is effectively spawning procedures that work simultaneously.
Thank you very much for the time,
Lubomir
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Apr 19, 2006
Hi:
My service broker was working perfectly fine earlier. As I was testing...I recreated the whole service broker once again.
Now I am able to get the message at the server end from intiator. When trying to send message from my server to the intiator it gives this error in sql profiler.
broker:message undeliverable: This message could not be delivered because the Conversation ID cannot be associated with an active conversation. The message origin is: 'Transport'.
broker:message undeliverable This message could not be delivered because the 'receive sequenced message' action cannot be performed in the 'ERROR' state.
How do I proceed now ?
Thanks,
Pramod
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Jan 18, 2008
We have implemented our service broker architecture using conversation handle reuse per MS/Remus's recommendations. We have all of the sudden started receiving the conversation handle not found errors in the sql log every hour or so (which makes perfect sense considering the dialog timer is set for 1 hour). My question is...is this expected behavior when you have employed conversation recycling? Should you expect to see these messages pop up every hour, but the logic in the queuing proc says to retry after deleting from your conversation handle table so the messages is enqueued as expected?
Second question...i think i know why we were not receiving these errors before and wanted to confirm this theory as well. In the queuing proc I was not initializing the variable @Counter to 0 so when it came down to the retry logic it could not add 1 to null so was never entering that part of the code...I am guessing with this set up it would actually output the error to the application calling the queueing proc and NOT into the SQL error logs...is this a correct assumption?
I have attached an example of one of the queuing procs below:
Code Block
DECLARE @conversationHandle UNIQUEIDENTIFIER,
@err int,
@counter int,
@DialogTimeOut int,
@Message nvarchar(max),
@SendType int,
@ConversationID uniqueidentifier
select @Counter = 0 -- THIS PART VERY IMPORTANT LOL :)
select @DialogTimeOut = Value
from dbo.tConfiguration with (nolock)
where keyvalue = 'ConversationEndpoints' and subvalue = 'DeleteAfterSec'
WHILE (1=1)
BEGIN
-- Lookup the current SPIDs handle
SELECT @conversationHandle = [handle] FROM tConversationSPID with (nolock)
WHERE spid = @@SPID and messagetype = 'TestQueueMsg';
IF @conversationHandle IS NULL
BEGIN
BEGIN DIALOG CONVERSATION @conversationHandle
FROM SERVICE [InitiatorQueue_SER]
TO SERVICE 'ReceiveTestQueue_SER'
ON CONTRACT [TestQueueMsg_CON]
WITH ENCRYPTION = OFF;
BEGIN CONVERSATION TIMER ( @conversationHandle )
TIMEOUT = @DialogTimeOut
-- insert the conversation in the association table
INSERT INTO tConversationSPID
([spid], MessageType,[handle])
VALUES
(@@SPID, 'TestQueueMsg', @conversationHandle);
SEND ON CONVERSATION @conversationHandle
MESSAGE TYPE [TestQueueMsg] (@Message)
END
ELSE IF @conversationHandle IS NOT NULL
BEGIN
SEND ON CONVERSATION @conversationHandle
MESSAGE TYPE [TestQueueMsg] (@Message)
END
SELECT @err = @@ERROR;
-- if succeeded, exit the loop now
IF (@err = 0)
BREAK;
SELECT @counter = @counter + 1;
IF @counter > 10
BEGIN
-- Refer to http://msdn2.microsoft.com/en-us/library/ms164086.aspx for severity levels
EXEC spLogMessageQueue 20002, 8, 'Failed to SEND on a conversation for more than 10 times. Error %i.'
BREAK;
END
-- We tried on the said conversation, but failed
-- remove the record from the association table, then
-- let the loop try again
DELETE FROM tConversationSPID
WHERE [spid] = @@SPID;
SELECT @conversationHandle = NULL;
END;
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Jun 2, 2015
Recently we migrated our environment to 2012.
We are planning to implement Xevents in all the servers in place of Trace files and everything is working fine.
Is it possible to configure Extended event to trigger a mail whenever any event (example dead lock) occurs.
I have gone through so many websites but i never find.
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Oct 25, 2011
My SQL Server 2005 SP4 on Windows 2008 R2 is flooded with the below errors:-
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).
Is there a way I can trace it how it is coming? When I check input buffer for these ids, it looks like it is tracing everything. All the general application DMLs are coming in these spids.
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Apr 8, 2008
I have been testing with the WMI Event Watcher Task, so that I can identify a change to a file.
The WQL is thus:
SELECT * FROM __InstanceModificationEvent within 30
WHERE targetinstance isa 'CIM_DataFile'
AND targetinstance.name = 'C:\Program Files\Microsoft SQL Server\MSSQL.1\MSSQL\Backup\AdventureWorks.bak'
This polls every 30 secs and in the SSIS Event (ActionAtEvent in the WMI Task is set to fire the SSIS Event) I have a simple script task that runs a message box).
My understanding is that the event polls every 30 s and if there is a change on the AdventureWorks.bak file then the event is triggered and the script task will run producing the message.
However, when I run the package the message is occurring every 30s, meaning the event is continually firing even though there has been NO change to the AdventureWorks.bak file.
Am I correct in my understanding of how this should work and if so why is the event firing when it should not ?
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May 31, 2007
Server 2003 SE SP1 5.2.3790 Sql Server 2000, SP 4, 8.00.2187 (latest hotfix rollup)
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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Nov 2, 2007
Hi all,
Can we get the event properties by using a query?
Are there any extended stored procuder to get the above?
Scenario:
>Desktop>Right Click on My Computer
>Go to Manage and click
>Expand System Tools
>Expand Event Viewer
>Application
click on one event.We can get the log info which is the manual procudure.
But now i want to get the event properties through the Query analyzer...
Any help would be great?
Thanks,
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Oct 22, 2007
We recently upgraded to SQL 2005 from SQL 2000. We have most of our issues ironed out however about every 1 minute there is a message in the Application Event log and the SQL log that states:
EVENT ID 18456 Login Failed for the users DOMAIN/ACCOUNT [CLIENT: <local machine>]
This is a state 16 message which I thought meant that the account does not have access to the default database. The account is actually the account that the SQL services run under.
Any ideas? We can't seem to figure this one out. We actually upgraded to 2005 from 2000 and had an error appear after every reboot that prevented the SQL Agent from running(This application has failed to start because GAPI32.dll was not found. Re-installing the application may fix this problem.) We did a full uninstall of SQL and reinstalled fresh and restored the databases from .bak files and that is when the EVENT ID 18546 started occuring every minute.
We don't have any SQL heavy hitters here so please be detailed with any possible solutions. That you very much for any help you can provide!
David
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Sep 25, 2006
I have a system that will post a message to a queue, but does not need to wait for a response - just needs to make sure the message arrived properly in the queue, not that is was processed at the receiving end. A second service will poll the queue to retrieve outstanding messages and will then move the message to an outside system. The movement of the message to the outside system will be wrapped in a transaction and if the process is successful, then the transaction will be commited otherwise it will be rolled back.
1) is it appropriate for the service that posts the message to send an END CONVERSATION ? This way the sending service will not be waiting for a response.
2) in the data movement phase, is it appropriate to issue and END CONVERSATION when commiting and not issue when ROLLBACK occurs. Or should ROLLBACK occur with a following END CONVERSATION with error message?
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Jul 30, 2006
I am attempting to learn Service Broker from Bob Beauchemin's book "A Developer's Guide to SQL Server" - Chapter 11. I'm finding it to be very good but I'm confused over the concept of closing a conversation. Could someone answer the following questions for me?
When a conversation is ended, can the conversation handle that was created when the conversation was created still be used? (I assume not)
Beauchemin says, on page 511, that when a conversation ends, "Any messages still in the queue from the other end of the conversation are deleted with no warning." Does this mean that if I send a message that expects a reply, but I end the conversation, the message is still sent, it is still received by the other endpoint, the other endpoint processes it, but I'll never receive the reply?
Beauchemin says that if no lifetime is specified, the conversation is active for the number of seconds which can be represented by the maximum size of an integer. Does this mean that if I don't specify a lifetime, a conversation is active for many, many years?
Thanks very much.
Amos
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Sep 6, 2007
I want to reuse conversations to minimize overhead during bursts of activity. Remus' article on reusing conversations (http://blogs.msdn.com/remusrusanu/archive/2007/05/02/recycling-conversations.aspx) is great. (I know you are reading this Remus, thanks.)
I was wondering if there is a simpler way of ending a cached conversation - Quiesce the conversation (Stop using it), then after some period of time, end it.
I create a conversation, cache it in RLY_Conversations, and use it for 50 seconds. After 1 minute, the dialog timer servicing proc ends the conversation. There will be no messages sent around the time the End Conversation takes place, thus no race conditions.
Do you see any problems with this method?
Select @DialogHandle = [conversation_handle]
From RLY_Conversations
Where TableName = @TableName and IsActive = 1 And
CreatedTmstp > dateadd(ss, -50, getdate())
if @DialogHandle is null
Begin
-- initialize a conversation and record it in our reuse table
BEGIN DIALOG CONVERSATION @DialogHandle
FROM SERVICE FirstHostRelayService
TO SERVICE 'SecondHostRelayService'
ON CONTRACT RelayContractSentByAny
WITH ENCRYPTION=OFF ;
-- cache the dialog handle to minimize dialog creation overhead.
Insert into RLY_Conversations (
TableName, conversation_handle, conversation_id, is_initiator, service_contract_id,
conversation_group_id, service_id, lifetime, state, state_desc, IsActive, CreatedBy, CreatedTmstp
)
Select @TableName, conversation_handle, conversation_id, is_initiator, service_contract_id,
conversation_group_id, service_id, lifetime, state, state_desc, 1, 'Setup', getdate()
From sys.conversation_endpoints
Where conversation_handle = @DialogHandle;
-- initiate housekeeping process
BEGIN CONVERSATION TIMER ( @DialogHandle )
TIMEOUT = 60;
End
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Feb 16, 2006
when you move a conversation to a conversation group, that conversation_group has to have been created previously, ie, you cant specify a non-existing conversation_group, right?
I ask because I am trying to develop an application where I use optimally one conversation related to many given conversation_groups, so that when I receive, I lock only a small determined subset of messages. What I could have used was a way to send messages on a conversation, specifying a conversation_group_id.
Any suggestions?
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Oct 16, 2006
Hi There
Message ordering is of utmost importance in our application.
As i found in testing the only way to ensure message ordering is if they are in the same conversation.If you send multiple messages in different conversations there is no garantee which will be processed first.
Therefore i will be creating conversations that last "forever", that is using a single conversation.
I plan on doing a BEGIN DIALOG CONVERSATION when an inititator site is setup and writing the conversation handle guid to a table.
I will them simply SEND ON SONVERSATION using the guid, i will never issue a end conversation from target or initiator.
Is this theory solid, ie: is there a better way or best practice to do this?
I know that conversatons persist with sql server restarts, however what happens if an initiator site db is restored ?
I was thinking of adding logic to first check if a conversation endpoint exists with the specified guid if not , then start another conversation. But is this the best way?
Thanx
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Jun 28, 2006
I am thinking of updating my SQL monitoring application to use Service Broker.
Right now I loop through my list of servers performing various checks on each server. Things like 'check last database backup', 'check for new databases', 'check for server restart'. I loop through, one server at a time, doing one check at a time. The more servers I have the longer it is taking.
So, I want to multi-thread the servers, but single-thread the checks on each individual server. This way I can check say, 5 servers at a time, but on each server I will only do one check at a time. This way I won't flood an individual server with multiple checks.
Is this possible? It looks like Conversation groups might be the way to go but I'm not sure.
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