In SQL Server 7.0 there was option that allows you to set 'MAX async io', but it no longer available in SQL 2000.
Does anyone know why this option is not available or did Microsoft replace this function with something else?
Thank You,
John
In SQL Server 7.0 there was option that allows you to set 'MAX async io', but it no longer available in SQL 2000.
Does anyone know why this option is not available or did Microsoft replace this function with something else?
Thank You,
John
SQL7 SP1 NT4 SP5
Hi.
Very long story and I will not bore you with it. What I need to do is call a stored procedure and from within that stored procedure, initiate other sp and get out before those other sp are finished running.
I know I can execute a job but my volume would be about 1 job per second with a life of 2-5 seconds. So in a very short period of time, I can stack up a large volume of jobs.
Anyone have any better ideas ?
Help Please !@!!
Craig Somberg
csomberg@stageone.com
Hello Everybody,
In the past few days I try to work with SQL Mobil and Replication.
And now I have a big problem.
When the replication ist running in my little application the pda-user wants not stop there working. So I try to implement some routines of code that I find in this onlinearticle: http://msdn2.microsoft.com/en-us/library/2ysxae29.aspx
The codes workes fine as long I don't start another SQL Task. When I start either (Select, Insert, Update or Delete) Statement the Database crash with errormessage: "The database file may be corrupted. Run the repair utility...
Can anyone give me a tip what I must do to fix this problem.
Many Thanks
Markus
Hi,
I'm currently writing an windows application where a LOT of threads connect to database and send small amount of data.
I'd like to ask you for the best approach to do it.
The way it's implemented now:
Each therad uses it's own SqlConnection sends few bytes of data and closes the SqlConnection. Each thread has to send initliazation data which i guess is few times bigger then accual data and then it has to close connestion even more bytes that could be avoided are sent.
The way i'd like it to be:
There is only one SqlConnection all therads share it. It's opened when the applications starts and closed when it's application is closed. This way i send initialization data only once and by doing this i can save some bandwidth.
Does SqlConnection operations has to be in critical area? Can it be used pararelly by many threads? Maby there is better way to do it? Is it recomended to close SqlConnection as soon as possible after query? If so why?
Thanks in advance,
Erxar
Hi Folks,
I've found a pretty good code example on http://www.dotnetfun.com for a Asynchronous Trigger.
I've parsed through the Code, to understand how to wirte my own Async Trigger with a Service Broker, but the Code isn't working! It seems that the stored procedure don't receive the messages in the queue, but the queue get's filled.
MessageType
CREATE MESSAGE TYPE myMsgXML
VALIDATION = WELL_FORMED_XML;
Contract
CREATE CONTRACT myContractANY
(myMsgXML SENT BY ANY)
Queue
CREATE QUEUE myQueue
WITH STATUS = ON,
RETENTION = ON,
ACTIVATION
(
STATUS = ON,
PROCEDURE_NAME = sp_myServiceProgram,
MAX_QUEUE_READERS = 5,
EXECUTE AS SELF
)
Service
CREATE SERVICE myService ON QUEUE myQueue (myContractANY)
Procedure (greped from http://www.dotnetfun.com/)
CREATE PROC sp_myServiceProgram
AS
-- This procedure will get triggered automatically
-- when a message arrives at the
-- Let's retrieve any messages sent to us here:
DECLARE @XML XML,
@MessageBody VARBINARY(MAX),
@MessageTypeName SYSNAME,
@ID INT,
@COL2 VARCHAR(MAX);
DECLARE @Queue TABLE (
MessageBody VARBINARY(MAX),
MessageTypeName SYSNAME);
WHILE (1 = 1)
BEGIN
WAITFOR (
RECEIVE message_body, message_type_name
FROM myQueue INTO @Queue
), TIMEOUT 5000;
-- If no messages exist, then break out of the loop:
IF NOT EXISTS(SELECT * FROM @Queue) BREAK;
DECLARE c_Test CURSOR FAST_FORWARD
FOR SELECT * FROM @Queue;
OPEN c_Test;
FETCH NEXT FROM c_Test
INTO @MessageBody, @MessageTypeName;
WHILE @@FETCH_STATUS = 0
BEGIN
-- Let's only deal with messages of Message Type
-- myMsgXML:
IF @MessageTypeName = 'myMsgXML'
BEGIN
SET @XML = CAST(@MessageBody AS XML);
-- Now let's save the XML records into the
-- historical table:
INSERT INTO tblDotNetFunTriggerTestHistory
SELECT tbl.rows.value('@ID', 'INT') AS ID,
tbl.rows.value('@COL2', 'VARCHAR(MAX)') AS COL2,
GETDATE() AS UPDATED
FROM @XML.nodes('/inserted') tbl(rows);
END
FETCH NEXT FROM c_Test
INTO @MessageBody, @MessageTypeName;
END
CLOSE c_Test;
DEALLOCATE c_Test;
-- Purge the temporary in-proc table:
DELETE FROM @Queue;
END
Send Message in a Update Trigger
SELECT @XML = (SELECT * FROM inserted FOR XML AUTO);
-- Send the XML records to the Service Broker queue:
DECLARE @DialogHandle UNIQUEIDENTIFIER,
@ConversationID UNIQUEIDENTIFIER;
/*
The target Service Broker service is the same
service as the initiating service; however, you
can set up this type of trigger to send messages
to a remote server or another database.
*/
BEGIN DIALOG CONVERSATION @DialogHandle
FROM SERVICE myService
TO SERVICE 'myService'
ON CONTRACT myContractANY;
SEND ON CONVERSATION @DialogHandle
MESSAGE TYPE myMsgXML
(@XML);
-- Let's detect an error state for this dialog
-- and rollback the entire transaction if one is
-- detected:
IF EXISTS(SELECT * FROM sys.conversation_endpoints
WHERE conversation_handle = @DialogHandle
AND state = 'ER')
RAISERROR('Dialog in error state.', 18, 127);
ELSE
BEGIN
--I want to list the queue after the trigger so I disabled
--END CONVERSATION @DialogHandle;
COMMIT TRAN;
END
The Problem is, that the Procedure doesn't even get started! So I tried to receive the Queues manually
WAITFOR (
RECEIVE message_body, message_type_name
FROM myQueue INTO @Queue
), TIMEOUT 5000;
and I run always into the timeout and get nothing back. A Select * FROM myQueue gives me some results back. Why I can't recevie?
Would be grateful for help, or at least a good tutorial, I haven't found one yet....
thx and greez
Karsten
After failing over to the DR replica. All databases are out of sync. DR replicas were setup as async the other 2 are set up as sync. Is this by design. No data has been updated to any of these as they are test dbs. So all dbs should be the same, no data loss.
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What all needs to be checked for looking into the feasibility of going ahead with a async mirror setup as mentioned above.
I get this error when I look at the state of my SQLresults object. Have I coded something wrong?Item = In order to evaluate an indexed property, the property must be qualified and the arguments must be explicitly supplied by the user. conn.Open()
Dim strSql As String
strSql = "INSERT INTO contacts (companyId, sourceId, firstName, lastName, middleName, birthday, dateCreated)" _
& "VALUES ('" & companyId & "', '" & sourceId & "', '" & firstName & "', '" & lastName & "', '" & middleName & "', '" & birthday & "', '" & now & "') SELECT @@IDENTITY AS 'contactId'"
Dim objCmd As SqlCommand
objCmd = New SqlCommand(strSql, conn)
Dim aSyncResult As IAsyncResult = objCmd.BeginExecuteReader()
If aSyncResult.AsyncWaitHandle.WaitOne() = True Then
Dim sqlResults As SqlClient.SqlDataReader
sqlResults = objCmd.EndExecuteReader(aSyncResult)
Dim cid As Integer
cid = sqlResults.Item("contactId")
Me.id = cid
conn.Close()
Return cid
Else
Return "failed"
End If