Placement Of Sys.conversation_endpoints And Sys.transmission_queue
Dec 21, 2006
Is there any thought going into moving these two tables to a file group that we can control? Putting this in Primary with the rest of my system tables is quite problematic, and hinders my ability to manage space usage on my files. Traditionally, we didn't have to consider a primary file group that could grow to large proportions, but now with these two tables it can. If a large volume of messages gets sent through and the system can't keep up, then these tables and my primary file group will grow sometimes enormously.
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Jul 25, 2007
hi all!
I have 2 instances that communicate via service broker.
The conversations are only one way from initiator server1 db to target server2 db.
I also reuse dialog id's in BEGIN DIALOG @dlgId
i save @dlgId from the first run into a table and then retreive it for each message send
since the messages are constant i don't close the dialog at the target for each message.
i'm just wodering why do both sys.transmission_queue and sys.conversation_endpoints get a row
for each message i send but the transmission_status in sys.transmission_queue is emtpy.
also each conversation_handle and conversation_id is different for each row and
only one row in each sys table has the same conversation_handle as my saved @dlgId.
just wondering what is going on.
this code is done on the initiator
DECLARE @dlgId UNIQUEIDENTIFIER
-- each database has one dialog id
SELECT @dlgId = DialogId
FROM dbo.Dialogs
WHERE DbId = DB_ID()
-- Begin the dialog, either with existing or new Id
BEGIN DIALOG @dlgId
FROM SERVICE [//DataSender] -- service on initiator server
TO SERVICE '//DataWriter', -- service on target server
-- Target's Service Broker Id
'83382A22-2830-4B25-B067-15AAC255EB03'
ON CONTRACT [//Contract1]
WITH ENCRYPTION = OFF;
-- Send data
;SEND ON CONVERSATION @dlgId
MESSAGE TYPE [//Message1] (@msg)
Thanx,
Mladen
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Oct 21, 2005
Is there anyway to figure out which tables/objects this view uses?
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Oct 12, 2006
I know that if a conversation is normally ended the handle will wind up in the sys.Conversation_endpoints table in a Closed State. I realize they are supposed to stay there for 30 minutes to prevent a reply attack, however the number of rows I have in this table continues to grow with the bulk of the states set to 'Closed'. I am trying to use this table to determine if I have any conversation handle leaks. I see some rows in there with a Disconnected Outbound state while some are conversing. What should I be looking for in this table and how can I know I have a problem (ie. leak). I realize that Disconnected Outbound is probably something i need to look into. Are there any other states I should be concerned with?
Gary
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Oct 26, 2006
So I took the time to build a reproduction of the conversation_endpoint problem that was discussed in another thread. I build two databases, with a send and receive queue. This is essentially the way the code works here at my site. I have a script near the bottom that sends messages every 5 minutes for 2 hours. If there is any logic that removes conversation_endpoints 30 min then the Message record table will show them.
Please let me know what I am doing wrong, so I can change my production code to help eliminate the large buildup in the sys.conversation_endpoints.
Thanks!
use master
go
if exists ( select * from sys.databases where name = 'SBSource' )
drop database SBSource
go
if exists ( select * from sys.databases where name = 'SBTarget' )
drop database SBTarget
go
-- Setup environment for test
create database SBSource
GO
ALTER DATABASE SBSource SET ENABLE_BROKER
ALTER DATABASE SBSource SET TRUSTWORTHY ON
GO
create database SBTarget
GO
ALTER DATABASE SBTarget SET ENABLE_BROKER
ALTER DATABASE SBTarget SET TRUSTWORTHY ON
GO
use SBSource
go
CREATE MESSAGE TYPE [msgTest] AUTHORIZATION [dbo];
CREATE CONTRACT [Test] ( [msgTest] SENT BY ANY );
CREATE QUEUE dbo.[SourceQueue] WITH STATUS = ON , RETENTION = OFF;
CREATE SERVICE [SBSourceTest] authorization [dbo]
ON QUEUE [dbo].[SourceQueue]
( [Test] );
CREATE ROUTE [ToTarget] AUTHORIZATION [dbo] WITH SERVICE_NAME = N'SBTargetTest' , ADDRESS = N'LOCAL';
GO
create procedure dbo.ProcessEndDialogMessages
as
begin
set nocount on;
declare @conversation_handle uniqueidentifier,
@message_type sysname,
@message_body xml;
begin transaction;
WAITFOR (
RECEIVE @conversation_handle = [conversation_handle],
@message_type = [message_type_name],
@message_body = [message_body]
FROM dbo.[SourceQueue]), TIMEOUT 1000;
while @conversation_handle IS NOT NULL
begin
end conversation @conversation_handle;
commit;
begin transaction;
set @conversation_handle = null;
WAITFOR (
RECEIVE @conversation_handle = [conversation_handle],
@message_type = [message_type_name],
@message_body = [message_body]
FROM dbo.[SourceQueue]), TIMEOUT 1000;
end
commit;
end
go
Alter QUEUE dbo.[SourceQueue] WITH STATUS = ON, Activation ( STatus = on, procedure_name = dbo.ProcessEndDialogMessages, MAX_QUEUE_READERS = 2, EXECUTE AS 'dbo' )
go
use SBTarget
go
CREATE MESSAGE TYPE [msgTest] AUTHORIZATION [dbo];
CREATE CONTRACT [Test] ( [msgTest] SENT BY ANY );
CREATE QUEUE dbo.[TargetQueue] WITH STATUS = ON , RETENTION = OFF;
CREATE SERVICE [SBTargetTest] authorization [dbo]
ON QUEUE [dbo].[TargetQueue]
( [Test] );
CREATE ROUTE [ToSource] AUTHORIZATION [dbo] WITH SERVICE_NAME = N'SBSourceTest' , ADDRESS = N'LOCAL';
GO
create table dbo.MessageRecord ( Conversation_handle uniqueidentifier, Inserted datetime )
go
create procedure dbo.ProcessTargetQueue
as
begin
set nocount on;
declare @conversation_handle uniqueidentifier,
@message_type sysname,
@message_body xml;
begin transaction;
WAITFOR (
RECEIVE @conversation_handle = [conversation_handle],
@message_type = [message_type_name],
@message_body = [message_body]
FROM dbo.[TargetQueue]), TIMEOUT 1000;
while @conversation_handle IS NOT NULL
begin
insert into dbo.MessageRecord ( Conversation_handle, Inserted ) values ( @conversation_handle, getdate() );
end conversation @conversation_handle;
commit;
begin transaction;
set @conversation_handle = null;
WAITFOR (
RECEIVE @conversation_handle = [conversation_handle],
@message_type = [message_type_name],
@message_body = [message_body]
FROM dbo.[TargetQueue]), TIMEOUT 1000;
end
commit;
end
GO
Alter QUEUE dbo.[TargetQueue] WITH STATUS = ON, Activation ( STatus = on, procedure_name = dbo.ProcessTargetQueue, MAX_QUEUE_READERS = 2, EXECUTE AS 'dbo' )
go
use sbsource
go
-- start sending messages, check count in conv_endpoints along the way
set xact_abort on
set nocount on
declare @EndAt datetime,
@msg xml,
@ch uniqueidentifier;
set @EndAt = DATEADD( hh, 2, getdate() )
set @msg = '<message>dfsafa</message>';
while getdate() < @EndAt
begin
set @ch = null;
begin transaction;
begin dialog conversation @ch
from service [SBSourceTest]
to service 'SBTargetTest'
on contract [Test]
with
encryption=off;
send on conversation @ch message type [msgTest] (@msg);
--- note the abscence of an end conversation, so no fire and forget!
commit;
waitfor delay '00:05:00'
end
GO
-- check on data after complete.
select state, count(*)
from SBSource.sys.conversation_endpoints
group by state;
select state, count(*)
from SBTarget.sys.conversation_endpoints c
inner join sbtarget.dbo.MessageRecord m on c.conversation_handle = m.conversation_handle
group by state;
select m.*, c.*
from SBTarget.sys.conversation_endpoints c
inner join sbtarget.dbo.MessageRecord m on c.conversation_handle = m.conversation_handle
select *
from SBTarget.dbo.targetqueue
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May 21, 2007
Hello,
I have a server that is used to query other servers to ensure that things are functioning correctly. On some of our servers we are running ServiceBroker and some of the monitoring involves querying the SYS.CONVERSATION_ENPOINTS view on these servers.
When I query the SYS.CONVERSATION_ENPOINTS view over a linked server it returns zero rows, though when I run the same query locally it returns data. I initially thought it was a permission issue but it seems I can see data across the linked server to other system views within the sys schema (ie sys.all_objects).
Is there something different/special about SYS.CONVERSATION_ENDPOINTS that prevents me from seeing its data across linked servers or have I simply got permission problems.
Thanks
Ian
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Dec 7, 2006
I hope someone can help me with this as we plan on using Service Broker in a high volume production environment. The script that builds everything is available if it's needed to diagnose the problem I'm having.
I'm having an issue where sys.conversation_endpoints on the target side of a conversation is never getting purged of closed conversations even after the 30 minute delay. The view is filled with closed conversations and database size is growing every day. I'm aware I can end conversation with cleanup on these conversations, but I would prefer that Service Broker behaves as expected. I'm also aware of the problems with the fire and forget model, but my model is request/response/end between 2 databases on the same server instance. Here's the typical series of events:
Initiator sends request
Target receives request
Target processes request
Target sends response
Initiator receives response
Initiator processes response
Initiator ends conversation
Target receives EndDialog message
Target ends conversation
Occasionally during the target's processing of a request, an exception is caught and the Target ends the conversation with an error:
Initiator sends request
Target receives request
Target processes request and recognizes error
Target ends conversation with error
Initiator receives EndDialog message
Initiator ends conversation
Here's the trace where Database ID 23 is initiator and 24 is target, no error:
EventClass
DatabaseID
TextData
EventSubClass
Broker:Conversation Group
23
1 - Create
Broker:Conversation
23
STARTED_OUTBOUND
11 - BEGIN DIALOG
Broker:Conversation
23
CONVERSING
1 - SEND Message
Broker:Message Classify
23
1 - Local
Broker:Conversation Group
24
1 - Create
Broker:Conversation
24
STARTED_INBOUND
12 - Dialog Created
Broker:Conversation
24
CONVERSING
6 - Received Sequenced Message
Broker:Activation
24
1 - Start
Broker:Conversation
24
CONVERSING
1 - SEND Message
Broker:Message Classify
24
1 - Local
Broker:Conversation
23
CONVERSING
6 - Received Sequenced Message
Broker:Activation
23
1 - Start
Broker:Conversation
23
DISCONNECTED_OUTBOUND
2 - END CONVERSATION
Broker:Conversation Group
23
2 - Drop
Broker:Message Classify
23
1 - Local
Broker:Conversation
24
DISCONNECTED_INBOUND
7 - Received END CONVERSATION
Broker:Conversation
23
CLOSED
10 - Received END CONVERSATION Ack
Broker:Conversation
24
CLOSED
2 - END CONVERSATION
Broker:Conversation Group
24
2 - Drop
Broker:Activation
23
2 - Ended
Broker:Activation
24
2 - Ended
Here are the typical records in the target sys.conversation_endpoints. These records never disappear:
Normal
With Error
conversation_handle
3FE27EE5-1E86-DB11-B009-000BDB714730
53E17EE5-1E86-DB11-B009-000BDB714730
conversation_id
0A432392-55F5-461B-87D5-0058795BC3AE
BCCDFA85-86A3-43B8-9648-24FFE5C0ED3F
is_initiator
0
0
service_contract_id
0
0
conversation_group_id
00000000-0000-0000-0000-000000000000
00000000-0000-0000-0000-000000000000
service_id
0
0
lifetime
2074-12-25 21:29:28.640
2074-12-25 21:29:28.000
state
CD
CD
state_desc
CLOSED
CLOSED
far_service
http://my.domain.com/schemas/test/Initiator/2006-12-07
http://my.domain.com/schemas/test/Initiator/2006-12-07
far_broker_instance
227D0898-0399-40E0-954B-C8B685EE415A
227D0898-0399-40E0-954B-C8B685EE415A
principal_id
5
5
far_principal_id
6
6
outbound_session_key_identifier
DEBEB4DB-D186-410B-9555-A34F8F5C9FE2
B82BB074-5AE5-4164-9D0B-53E364B0B52B
inbound_session_key_identifier
1DBAE307-5DFF-4050-9D94-71003D8BD058
57B5C7D8-9E8B-4614-9325-5AA30AED3670
security_timestamp
2006-12-07 18:45:52.763
1900-01-01 00:00:00.000
dialog_timer
1900-01-01 00:00:00.000
1900-01-01 00:00:00.000
send_sequence
1
1
last_send_tran_id
0x550800000000
0x700700000000
end_dialog_sequence
-1
1
receive_sequence
2
1
receive_sequence_frag
0
0
system_sequence
0
0
first_out_of_order_sequence
-1
-1
last_out_of_order_sequence
0
0
last_out_of_order_frag
0
0
is_system
0
0
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Aug 5, 2007
Hi! I'm wondering why is my sys.conversation_endpoints table inserting a new row for each message i send even when i reuse conversations?
when i send the first message i get the first row in the sys.conversation_endpoints with a uniqueidentifier for the conversation_handle. this uniqueidentifier is then saved in the table which i query the next time i send a message to reuse the dialog conversation.
But even though it looks like the uniqueidentifier is reused i still get a new row for every message i send with a different conversation_handle?
this happens in both target and initator db.
I've tried to understand this by i don't.
Also for the moment i don't end conversations. But as i understand it this shouldn't matter.
Also the message successfully arives to the target and sys.transmission_queue is empty in both databases.
Neither queues have any error messages in them.
Thanx
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Oct 17, 2006
I have seen this buried deep with the questions on Service Broker, but I am looking for it again. How do you delete all records from your sys.Transmission_Queue. This is on a test server and I want to clean it before some more test.
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Dec 19, 2007
We are having a problem with messages getting out of transmission_queue and into the queues themselves. The queues all are actviated and enabled, and our service broker is enabled at the database level. The dba detached & reattached the db yesterday, which I believe may be the cause of this problem. Everything seems to be in order (sp ownership, activation procs, etc), except when I run:
select [name], count(*)
from sys.dm_broker_queue_monitors qm
inner join sys.service_queues sq on qm.queue_id = sq.object_id
group by [name]
I get 2 entries for each queue. And the last_activated_time is the same date as the detach event. When we reattached we had to do an alter database set enable_broker in order to get it back up and running. When I run the above query on our dev and test environments, I get only one entry per queue.
Does anyone know why this would happen? Is this a valid state for SB?
And to get past it, if we can't figure out the real fix for it, we want to get a copy of all the messages in the transmission queue, do an alter database set new_broker, then replay them all into SB. We hope this fixes the root cause, but it's a guess.
Any ideas? Thanks in advance,
John
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Aug 14, 2007
Hi,
At my company, we're trying to use service broker to create a client-server system where there is a head office machine and multiple outlets registered with that head office. My problem is that sometimes when a branch sends a message to the head office, it just seems to sit in the transmission queue and never gets sent. If I run a script that forcibly ends the conversations on the client machine (with cleanup), storing the message bodies and then resend them, they seem to get through fine.
The way that we send messages is by calling a t-sql stored procedure from a c# application using SqlCommand (don't know if this should make any difference).
If I monitor the Head Office machine and one of the Outlets while this is happening, on the HO I get three events in a row:
Broker: Message Classify (1 - Local)
Audit Broker Conversation (2 - No Certificate)
Broker: Message Undeliverable (1 - Sequenced Message)
The TextData contained in the third event is: This message could not be delivered because the security context could not be retrieved.
The RoleName of the server is Initiator, and the TargetUserName is the name of the service on the Outlet.
On the Outlet I get the following event repeatedly (presumably as it continues to try sending the message) - Broker: Remote Message Acknowledgement (1 - Message With Acknowledgement Sent).
On the client the RoleName also appears to be Initiator, and the TargetUserName is blank.
This would make me suspect that certificates were missing or something, except that if I remove messages from the queue and resend them they seem to get through, and also I've checked both databases and they have the correct certificates.
Any ideas?
Thanks in advance,
Adam
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Jan 29, 2007
Sorry for the stupid question, but I can't seem to figure it out...
There are 119 messages that are stuck in the transmission queue, all for the same queue. When I check the status of the queue (via sys.service_queues), is_receive_enabled = 1, is_activation_enabled = 1, and max_readers = 3. When I check to see if there is an active queue monitor (via sys.dm_broker_queue_monitors) there is nobody watching this queue. What would cause this queue to be active, enabled but have nobody montioring it? Is there something internal that went wrong that made these (outbound) messages get stuck in the transmission queue, and is not showing up in the views? How can I get these messages "un-stuck" and flow through the system?
A problem I am seeing is the return message to this queue (to signify the target has consumed the message, and to end the conversation) are not being consumed, thus getting stuck in the "DI" state.
Any suggestions would be greatly appreciated.
Thanks in advance,
John Hennesey
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Feb 15, 2006
Are lock hints propagated to the underlying tables of system catolog views? I ask because I often query sys.transmission_queue with nolock, and I wanted to know if this was honoured through out the underlying tables.
Secondly, is sys.transmission_queue indexed at all, providing a way to prevent table-scanning?
Thanks
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Mar 26, 2007
For some reason the messages are stuck at sys.transmission_queue. The transmission status seems to be null. I verified all the Queues and they hae the values of (is_receive_enables = 1, is_enqueue_enabled = 1, is_activation_enabled = 0)
I have set up the service broker on different domain and have bidirectional ports open to receive messages.
I can send and receive messages, when I run the same service broker setup scripts at the machines that belongs to same domain .
any help appreciated.
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Jul 13, 2005
as Christopher Yager say in "Need distributed service broker sample", I also test sending messages between two SQL Server 2005 instances,and after I setup the test environment with instance1 and instance2,I find queue [q2] in ssb2 can't receive message from ssb1. when I query by "select * from sys.transmission_queue",I get some message records that transmission_status is "64(error not found)".
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Feb 28, 2007
I may have a misunderstanding of how SB works, but this seems like a problem.
If a queue is disable (i.e. status = off) and a message is sent to the queue the message is placed on the sys.transmission_queue. Once the queue is enabled I thought the messages were sent to the queue in the order they were placed on the sys.tranmission_queue? I have been troubleshooting a problem and this is not the case. Do I have a misunderstanding of how the sys.transmission_queue works?
The queue has retention turned off.
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Nov 30, 2004
Can I choose where I want to store my database using MSDE
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Jul 20, 2005
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Jason
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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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Jan 29, 2008
I've got 2 service broker databases on remote servers. I've created my endpoints, my routes and have everything set up. But when i send a test message, the messages set in the transmission_queue. There is no transmission_status. And when i look in at the sys.conversation_endpoints view I see that the conversation status is conversing. One odd thing I wanted to point out though is that the far_broker_instance column of the sys.conversation_enpoints view is null. When i run a trace on both databases, I see activity on the Initiator with things like Started_OutBound and conversing but I don't see any messages such as acknowledgment or any errors. On the Targer side I see no activity at all. Does anyone know what the deal is. Why don't I get some kind of error message. Why are all my messages staying in the transmission_queue?
Thanks in advance.
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Jul 21, 2004
Hello,
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Thanks.
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Using SQL2000
Is it recommended to put tempdb data and logs files on different drives?
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Jun 7, 2007
Hello,
I have a question..
I set-up my Service Broker comunication on the same SQL Server Instance beetween 2 different DBs.
One DB behave as Initiator and send messages to the SB service setup in the other DB.
I execute the SEND statement from the Initiator and if I count the messages on the sys.transmission_queue before to commit the transaction the count returns 0.
If I try to send a message not compliant with the message type, the count that runs after the SEND returns 1 - far enought.
I'm confused about the first behaviour because from what I understood the Acknolodgment and the removal of the message from the sys.trasmission queue should happen after the COMMIT.
Some expert can aswer to this direct quection?
Thank you
Marina B.
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What is the best performance for this configuration:
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tempdb
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Surgery table
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102,Jack,0800,1030
102,Bart,1030,1130
102,Jack,1130,1215)
Select Patient INNER JOIN Anesthesia produced too many case results. So, I figured out there is an AnesthesiaTime table that only gets used if the anesthesia guys take time-outs. That doesn't happen all the time. I could use TOP 1 on the Anesthesia table, but technically I need to read the AnesthesiaTime table and locate the last time and pull that crna, Jack. I'm not sure how to deal with an optional table. I believe the IF Exists will be pertinent, but not sure of how to build this query. I've tried subquery without success.
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Apr 18, 2015
I can't seem to place the "option (recompile)" in any valid position so that the following procedure executes without a syntax error .
USE [PO]
GO
/****** Object: StoredProcedure [dbo].[npSSUserLoad] Script Date: 4/18/2015 3:57:38 PM ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
[Code] ...
-- Generated code - DO NOT MODIFY
-- From Object Schema: 'C:XXXXXX.NetPOPOModel\_ObjectSchema
-- To regenerate this procedure use the 'Open With' option on file _ObjectSchema and select POCodeGen.exe
Declare @SqlCmd nvarchar(max)
Declare @ParamDefinitions nvarchar(1024)
Set @ParamDefinitions = N'@UserId int,NTUser varchar(30), @XmlResult XML OUTPUT'
Set @SqlCmd = N'Set @XmlResult =
(
Select
[UserId] [a],
[UserName] [b],
[code]....
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