Transactions/Client-Side Redirect Issue

Mar 23, 2006

Hi there.

With Client-Side Redirect, connections can be dinamically redirected in case of failover. But if a long transaction is running on the principal, when it fails the redirect doesn´t work with the current ado.net connection, connected to the database running that transaction.

So if the principal fails, current running transaction will be lost right ?

 

Thanks in advance.

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Client-side Redirect Problem

Feb 14, 2006

Hi there.

I have a database mirroring session running, and both principal and mirror are working fine. But when i unplug the network cable from principal server, creating a failover scenario, the client doesn´t get redirected to the mirror.

I get an error saying: "A transport-level error has ocurred when received results from the server. The specified network name is no longer available."

 

 

connection = "Data Source=SISAD;Failover Partner=Projecto-SWS1;Initial Catalog=SIERE;Persist Security Info=True;User ID=sa;Password=testing;Connection Timeout=100";

//this method is called many times by a thread, emulating some request to the server

public static void Inserir(int codAutor)

{

SqlConnection sqlConnection = new SqlConnection(connection);

SqlCommand command = new SqlCommand("insert into Autor values(@codAutor,'test')", sqlConnection);

command.CommandType = CommandType.Text;

command.Parameters.AddWithValue("@codAutor", codAutor.ToString());

command.CommandTimeout = 200;

sqlConnection.Open();

command.ExecuteNonQuery();

sqlConnection.Close();

}

 

I think the error is because the ExecuteNonQuery() method return info about the rows affected on the server. But in this case how can i create a failover scenario with client-side redirect ?

Thanks in advance.

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Sep 22, 2006

Hi All,

My apologies if this question seems abit basic, but I'm a DBA by trade and programming .Net isn't my strong point ;)



I've enabled database mirroring on 3 SQL 2005 servers, a principal, a mirror and a witness.



Principal - SQL 2005 Enterprise Edition, SP1

Mirror - SQL 2005 Enterprise Edition, SP1

Witness - SQL 2005 Express, SP1



I've written some test code to test the mirroring but as soon as the connection is pulled from the principal, the client re-direct doesn't work and the program bombs. I'd be grateful fi someone could have a look at my code below and tell me if there's any schoolboy errors??



(NB, the user running the code is a sys admin on all 3 servers)



Thanks in advance.



Imports System.Data.SqlClient



Public Class Form1

Dim DCTADS As New SqlClient.SqlConnection

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

DCTADS.ConnectionString = "Network=dbmssocn; Server=STUD; Failover Partner=DBDRTEST; Database=mirrortest; Integrated Security=True"

DCTADS.Open()

End Sub



Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

Dim cmd As New SqlClient.SqlCommand

cmd.CommandText = "Select fulldesc from unclproduct where internal = '20000110'"

cmd.Connection = DCTADS

Dim dr As SqlClient.SqlDataReader

dr = cmd.ExecuteReader

MsgBox(DCTADS.DataSource.ToString)

If dr.Read Then

MsgBox(dr("fulldesc").ToString)

End If

dr.Close()

End Sub

End Class

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Sep 22, 2006

Hi All,

My apologies if this question seems abit basic, but I'm a DBA by trade and programming .Net isn't my strong point ;)



I've enabled database mirroring on 3 SQL 2005 servers, a principal, a mirror and a witness.



Principal - SQL 2005 Enterprise Edition, SP1

Mirror - SQL 2005 Enterprise Edition, SP1

Witness - SQL 2005 Express, SP1



I've written some test code to test the mirroring but as soon as the connection is pulled from the principal, the client re-direct doesn't work and the program bombs. I'd be grateful fi someone could have a look at my code below and tell me if there's any schoolboy errors??



(NB, the user running the code is a sys admin on all 3 servers)



Thanks in advance.



Imports System.Data.SqlClient



Public Class Form1

Dim DCTADS As New SqlClient.SqlConnection

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

DCTADS.ConnectionString = "Network=dbmssocn; Server=STUD; Failover Partner=DBDRTEST; Database=mirrortest; Integrated Security=True"

DCTADS.Open()

End Sub



Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

Dim cmd As New SqlClient.SqlCommand

cmd.CommandText = "Select fulldesc from unclproduct where internal = '20000110'"

cmd.Connection = DCTADS

Dim dr As SqlClient.SqlDataReader

dr = cmd.ExecuteReader

MsgBox(DCTADS.DataSource.ToString)

If dr.Read Then

MsgBox(dr("fulldesc").ToString)

End If

dr.Close()

End Sub

End Class

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Hi!

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-------------------------------------------------------

I have set up mirroring and trying to get it to work from my .NET
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-------------------------------------------------------

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