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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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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Hello friends....
my question is as follows:
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waiting for answers.....
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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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Oct 12, 2005
Will this work with replication too. I see it with a mirror database, but could it work if I was keeping two copies of the database and wanted to transparently reroute the connection to a surviving server?
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Apr 12, 2006
Hi!
I posted this on the adonet forum but didn't get any response so I might as well post it here. Hope anyone can help me.
-------------------------------------------------------
I have set up mirroring and trying to get it to work from my .NET
application. Mirroring seems to work ok.
When I do a manual failover the witness is updated properly in the
sys.database_mirroring_witnesses table so it seems to be configured
correctly. I also can shutdown the master database and the mirror takes over.
My application is configured with Server set to my master database and
FailOverPartner to my mirror database.
If I am connected to the master database and do a manual fail-over all my
attempts to communicate with the database fail with an exception, even after
repeated retries.
(System.Data.SqlClient.SqlException: A transport-level error has occurred
when sending the request to the server. (provider: TCP Provider, error: 0 -
An existing connection was forcibly closed by the remote host.).)
If I do a manual fail-over and restart my application it connects to the
mirror database and everything is working. If I now do a manual fail-over I
get the same exception, but after a few retries it connects to the master
database.
The field Connection.Datasource always shows the master database regardless
if it's connected to the mirror.
What am I doing wrong? Is this how it's supposed to work?
-------------------------------------------------------
I have been pulling my hair over this problem and I just can't get it to work.
I'm using SQL Server Authentication to access the database and I can connect
to the master when it's acting as principal and I can connect to the mirror
when it's acting as principal, but when doing a fail-over, manual or shutting
down the master server it never tries to connect automatically to the mirror
even if it's changed role to principal.
Do the client need access to the witness in any way?
I'm using version 2.0.50727 of System.Data.dll.
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