Reusing A Single Conversation Handle
Aug 30, 2007
Hi
I have a replicated table that has a trigger attached to the it. The trigger fires off a service broker message for inserts. Originally for every insert, I would begin a conversation, send, and end the conversation when target send an end conversation. Since replication process is only using a single spid, I would like to reuse 1 conversation. the following is what I have for the send procedure in the initiator. I check the conversation_endpoints for any open conversation, if it's null, I start a new conversation and send else just send with the existing conversation. Is there anything wrong with this code? What could cause the conversation on the initiator to be null if I never end the conversation on the initiator side? thanks
DECLARE @dialog_handle uniqueidentifier
select @dialog_handle = conversation_handle from sys.conversation_endpoints where state = 'CO'
IF @dialog_handle is NULL
BEGIN DIALOG CONVERSATION @dialog_handle
FROM SERVICE [initiator]
TO SERVICE 'target'
ON CONTRACT [portcontract];
SEND ON CONVERSATION @dialog_handle
MESSAGE TYPE [Port] (@msg)
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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 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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Nov 29, 2005
within the context of the sys.conversation_endpoints system view, there is:
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Feb 8, 2008
Hi,
I have implemented Remus Resanu's implementation from the Recycling Conversations article and I am experiencing locking issue when I try to insert new conversation handles to the SessionConversations table. I have copied the code in the article exactly including the activation procedure. Any ideas why I may be locking. I am thinking it is related to the HOLDLOCK hint on the table.
The sepcific line where I see locking is directly from the article:
INSERT INTO [SessionConversations] (SPID, FromService, ToService, OnContract, Handle) VALUES (...etc)
Thanks
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Dec 1, 2006
I have a initiator and a target service broker peer.
Both are controlled by a C# unit test. The initiator uses the Microsoft.Samples.SqlServer class. The target service uses stored procedure activation.
Sending a message from the initiator to the target, saves the content of the message, along with its conversation handle in the target's database specific table.
The unit test needs - at a later time - to instruct the target to send a message back on the same conversation handle to the initiator service.
For this the C# unit test creates a Conversation off of the saved conversation handle:
Service client = new Service("cleintservicename", conn, tran);
Conversation dialog = null;
dialog = new Conversation(client, convHandle);
Sending the message on this dialog generates an error "Message body: <Error xmlns="http://schemas.microsoft.com/SQL/ServiceBroker/Error"><Code>-8495</Code><Description>The conversation has already been acknowledged by another instance of this service.</Description></Error>".
Is the error due to the fact that a service - using the activated stored procedure already picked up the conversation, so that a new reference to the service can not be created through the Service class in CLR?
If so, I might need then to skip the activated stored procedure in favor or a CLR service, alltogether?
Any help - greatly appreciated.
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Feb 4, 2008
Hello friends
I am new to SQL database design.I am having a table name customerletter_master in which all details of customer letters are saved.At a time i.e in single second around 200- 400 entry are made in customerletter_master table. Hits to customerletter_master table are more.
Following fields are used in customerletter_master – CID (autogen number), letterno(primary key),consignee, consignor, letterstatus1, letterstatus2, letterstatus3, POD, and some more fields. When letter passes to different stages letterstatus1 is filled to yes and then letterstatus2 and letterstatus3 are filled according to passage of letter.
And at same time many user can accesses the customerletter_master table to search any letter according to letterno. Therefore customerletter_master is used to enter data and to search data at same time and there can be more than 200-400 users doing add and search records to and from customerletter_master
how should i design this table. What should i use to enter and search record and minimize the table hits made by the user at same time. Should i use store procedures or any other method to add and search record. Plz help me out by giving some example.
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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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Nov 12, 2003
Hi all,
I am accessing one database a bunch of different times all throughout my code...in various functions and different web pages. Is there a a way to create an sqlconnection that I can access all the time, instead of constanting hardcoding which database to go to? I've tried putting the info in another file and just including it where I want the database to open, but I can't use <!-- #INCLUDE --> inside of the server scripts.
Can anyone help
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Jan 2, 2006
Every time my asp.net app needs to open a connection, it tries to establish a new connection with the mssql server. I´ve already set the max pool size property in the connection string. After that, my app raises an "time out"error saying it couldn´t obtain a connection from the pool. The problem is that I have a lot of iddle connections. With the Enterprise Manager I can see the status of the connections. They´re all the same "awaiting command". How can I reuse this connections? I know that the connection string must be the same for all connections and it is. I´ve set it in the web.config file. If I remove the max pool size property from the connection string I get a lot, I mean A LOT of connections with the sql server. Any ideas?
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Apr 19, 2008
Hi ,
I want to open and close sql connection only once and want to use in every function without open or close this connection in class file in asp.net 2003 .
how can it possible .
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Feb 20, 2008
Okay, so yes, I am new to SQL server...
I have this SP below, and I am trying to reuse the value returned by the Dateofplanningdate column so that I don't have to enter the code for each additional column I create. I have tried temp tables and derived tables with no luck.
REATE Proc CreateMasterSchedule
as
Select
dbo.[MOP_Planning Overview].warehouse,
dbo.[MOP_Planning Overview].[Item Number],
dbo.[MOP_Planning Overview].[Planning Date],
CAST (Convert (char(10),[Planning Date], 110)as DateTime)as DateofPlanningDate,
(case when dbo.[MOP_Planning Overview].[Order Category]='101' AND CAST (Convert (char(10),[Planning Date], 110)as DateTime)
<= (CAST (Convert (char(10),(dateadd(day, 8 - DATEPART(dw, dateadd(d,@@DATEFIRST-8,getdate())) ,getdate())-7),110) as DateTime)-1)then dbo.[MOP_Planning Overview].[Transaction Quantity - Basic U/M] else 0 end)as PriorInProc,
If I try to use DateofPlanningDate in the above case statement, I get the invalid column name error.
Basically, I just need a way to reuse the value returned by this column.
Can anyone help?
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Oct 23, 2006
I was looking at a means of reusing dialogs.
The attempt I tried was looking up an existing dialog in the conversation_endpoints.
However on doing a scale test I would that the non blocking I was hoping wasn't happening. Even through I was giving each spid a new dialog by using a conversation_group_id related to the spid. I found that the following SQL was blocked by a transaction that contains a begin dialog. This suggests the locking on conversation_endpoints is too excessive.
select top 1 conversation_handle
from sys.conversation_endpoints ce
join sys.services s on s.service_id = ce.service_id
join sys.service_contracts c on c.service_contract_id = ce.service_contract_id
where s.name = 'jobStats'
and ce.far_service = 'jobStats'
and (ce.far_broker_instance = @targetBroker OR @targetBroker = 'CURRENT DATABASE')
and ce.state IN ('SO','CO')
and ce.is_initiator = 1
and (ce.conversation_group_id = @conversation_group_id )--or @conversation_group_id is null)
and c.name = @contractName
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Apr 30, 2008
In the Package configurations wizard, I am trying to edit an existing configuration using the edit button. In the Configuration Filter, I get the list of several filters (the filters which were used for other packages). Whe I try to reuse an used filter, it is forcing me to set a new value and when I go back to SQL Server tables , I see the old value has got erased.
Can I not use an existing filter?. Do I need to use new filters for every new package?.
Thanks.
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Mar 23, 2004
Hi,
I'm trying to test some queries in SQL analyser without reusing the query plan (already cached). I know that there is a way to avoid that but I don't remember right now. Another option would be to restart MS SQL service but I don't want to do that.
Any thoughts...?
Thanks,
S.
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May 10, 2006
Is it possible to reuse a Lookup component which is configured with Full chaching?
My requirement is as follows....
A input file have 2 columns called CurrentLocation and PreviousLocation. In the dataflow, values of these two columns needs to be replaced with values from a look up table called "Location".
In my package i have added two LookUp components which replaces values of CurrentLocation and PreviousLocation with the values available in the table "Location". Is there any way to reuse the cache of first lookup component for second column also?
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Oct 22, 2007
Hi,I'm constructing a query that will performs a lot o datetimecalculumns to generate columns.All that operations are dependent of a base calculum that is performedon the query and its result is stored in a columna returned.I wanna find a way of reusing this generated column, to avoidreprocessing that calculumn to perform the other operations, causethat query will be used in a critical application, and all saving isfew.Thanks a lot.
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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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Feb 1, 2007
I currently have multiple (parent and child) packages using the same config file. The config file has entries for connections to a number of systems. All of them are not used from the child packages. Hence, my child package throws an error when it tries to configure using the same config file because it can't find the extra connections in my connection collection.
Does anyone have any ideas on the best way to go about resolving this? Is multiple config files (one for each connection) the only way?
Sachin
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Mar 3, 2004
Hello,
I have a real heartache with runtime parameter interogation on my DB.
Sure I get the latest and greatest and sure I don't have to type in all those lovely parameter types..but...the hit I take on performance for making no less then 3 DB hits for each SqlAdapter is unreasonable!
So ...I like the idea of maybe calling it once for all my stored procs on application startup...and then maybe saving this in CacheObject.
My problem is that I can't see where you can even serialize a SqlParametersCollection or even for that matter assign it to a Command object. Can you cache a command object ?
LOL
I think I may just have to write some generic routine for creating and populating my command objects based on a key (type) and then use that to fetch my command.Update,
command.Insert and command.
I would like to use the new AsynchBlock to do the fetching of the stored proc parameters and then just pull them from the Cache object....put a file watch so that if the DB's change my params it re-pulls them again.
*nice*.....
Then I get the best of both worlds...caching...and no parameter writing...
Eric
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Oct 26, 2005
I have 5 packages in a solution.
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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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Dec 20, 2005
I'm having some troubles with conversation groups. I need to send two messages on the same conversation group so I have the following in my SP....
BEGIN DIALOG CONVERSATION @providerConversationHandle
FROM SERVICE [ProviderDataService]
TO SERVICE 'CalculatedDataService'
ON CONTRACT [ProviderDataContract]
WITH ENCRYPTION = OFF
, LIFETIME = 600;
BEGIN DIALOG CONVERSATION @curveConversationHandle
FROM SERVICE [ProviderDataService]
TO SERVICE 'CalculatedDataService'
ON CONTRACT [ProviderDataContract]
WITH RELATED_CONVERSATION = @providerConversationHandle
, ENCRYPTION = OFF
, LIFETIME = 600;
SEND ON CONVERSATION @providerConversationHandle
MESSAGE TYPE [ProviderDataMessage] ( @providerMessage );
SEND ON CONVERSATION @curveConversationHandle
MESSAGE TYPE [ProviderCurveMessage] ( @curveMessage );
When I query the queue I see two messages, but they don't have the same conversation_group_id.
Any ideas?
Thanks.
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Jul 26, 2006
I have not been successfull in getting conversation group to work. My understanding is that I can specify a 'guid' for a conversation group id in the create dialog and when I send a message on this conversation it will have that specific guid for its conversation group. When I do this it does not appear this way in the "target" queue.
I am looking for an example to help me understand how to use a conversation group. The MSDN has not really provided that run able example that I can run and verify and tweak.
The idea that I would like to try is that the initiator must send 5 different XML messages to a target. These 5 messages are all related and must exist together. What I assume is that if I want the target to get all 5 messages together out of the queue all messages must be sent in their own conversation but all linked with the same conversation group Id. I have not been able to get this to work.
The communication is really a one way where the initiator sends the data to the target and does not process or need a message sent back from the target.
Thank you for your time.
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Jul 13, 2006
I have a conversation that I want to know has not ended so I am using LIFETIME.
When the conversation times out I then have three records in the queue.
1. The original conversation record that has not been received.
2. Error message to the initiator.
3. Error message to the target.
Both message bodies on the error records say that it was a lifetime error.
If I end the conversation on the initiator side after it is sent, I still get the target error record but the message_body field is null.
So say I don't end the conversation on the initator side. My next receive on the target side will pull the original record. Then it will pull the initator record and then it will pull the target record. Nothing on that record says that it had timed out.
What is the best practice for handling lifetime errors?
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Mar 21, 2007
When I try to execute the following statement:
END CONVERSATION DIALOG CONVERT(uniqueidentifier, '58C1A7AA-C0D7-DB11-B4C6-005056C00008')
using ICommand.Execute method, I got an error:
Incorrect syntax near the keyword 'END'.
I use SQL Native Client as OLE DB Provider.
In profiler I can see that my statement becomes like this:
exec END CONVERSATION CONVERT(uniqueidentifier, '903586ED-C0D7-DB11-B4C6-005056C00008')
So provider add 'exec' before my statement, maybe because NCLI don't know such statetment and thinks that it is a stored procedure call with the name 'END'?
Is there is a way to avoid it except of using following construction:
exec sp_executesql N''END CONVERSATION ...
?
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Jan 17, 2007
Hello people
I am new to service broker and would like a little help please. I have a SP which gathers information from a collection of tables. Depending on the data gathered it may or may not begin a dialog conversation with a service broker queue. What i'm needing to know is should at the end of the SP once the required message has been sent should i end the conversation or not?
Many thanks in advance, Michael
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Oct 18, 2006
Given that the conversation states are as follows: (Thanks Rushi!)
Event Initiator Endpoint state Target Endpoint state
BEGIN DIALOG SO --
from Initiator
to Target
SEND message(s) CO --
from Initiator
to Target
Target receives a fragment CO SI
of the first message sent
or receives out of order
message
Target received entire CO CO
first message
END conversation at CO DO
target
Initiator receives EndDialog DI DO
message from target
Target receives ACK for the DI CD
EndDialog message sent
END conversation at CD CD
Initiator
When does the 30 minute timer start for clearing the conversation from the sys.conversation_handles table? Is it the same for both sides (initiator and Target) ie, the end conversation at the Initiator. I guess it must be just in case a resend is necessary.
Gary
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