Connection Between Principal And Mirror Servers
Apr 2, 2007
Hi guys, right now I am facing this scenario several times and I wonder why it can be happen. Both SQL servers are in Enterprise SP1 edition. The mirroring setup can be work fine to me. Once my principal get attacking by DDOS, then mirroring session change the status to 'DISCONNECTED'. However, after DDOS attack solved and line connection gets back on the principal server, the mirroring session still remain to the status ('DISCONNECTED'). If I restart the SQL services on principal server or mirror server, then only the mirroring session change to 'SYNCHRONIZING' status. Does anyone faced this happen before? I need some assistance on it and hope able to get any explanation or solution from you guys. Thanx and have a nice day.
Best Regards,
Hans
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Sep 26, 2007
We have mirroring setup for 5 dbs, 4 of which are synchronized and 1 which is in "synchronizing" state on the principal and "restoring" state on the mirror. Mirroring for all dbs has been working fine for the past several months and we have a witness that has allowed automatic failover in the past without problems.
This database has several bulk inserts performed throughout the day and am sure there is some latency due to the size of these transactions.
Not sure as to why this is happening all of a sudden, but the db in question has been in this state for the past 12 hrs. I checked the mirroring status on the principal and it states that it is "synchronizing: data is being transferred from principal to mirror", but the mirror server states that db is in "restoring" state. Can anyone suggest as to how I can get the database on the mirroring server to get back to "mirror, synchronizing/restoring..." state? Or suggest on how I can troubleshoot this?
Thanks in advance.
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Apr 13, 2007
I have a Server Agent Job that does a full backup of my principal database. I then have a separate job which does an incremental backup of the log files every 20 mins throughout the working day - the incremental backup sends me an email if it fails.
If I establish a failover to the mirror server, the backups continually try to run, sending me an email every 20 mins telling me that it can't back up the database as it's a Mirror.
Is there any way to script a method in the job that checks to see if the DB is a principal or mirror. if it's a principal I want the backup to happen, if it's a mirror I want it to skip the job.
Thanks in advance to anyone that can help
Niels
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Nov 29, 2006
Hi,
can we control how transaction send from principal to mirror ?
If application inserting 10000000 rows in one transaction to principal database
how infomation will be transfered once it is commited and where it will be stored before it is replayed on mirror database?
1. Is it going to be 1 big data packet ?
2.is it going to be split on many packets (of what size ?)
Thanks
Alex
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Mar 3, 2006
Hi there.
Imagine this scenario in High Availability mode :
The principal sends a transaction log to the mirror, then the mirror saves the log on disk and then notify the principal. What happen if the acknowledge is lost, because a network failure(back on track in 1 or 2 seconds) and the principal dont receive it ?
In this case an automatic failover will not occurr, and i dont really know what happen next...
Will the mirror resend the ack ?
The heartbeat mechanism plays an important role in solving this scenario ?
The principal must receive the ack to commit the transaction, and i´m not seeing how the problem is solved.
I have one other question. In "Database Mirroring in SQL Server 2005" document, is said that "...unlike a distributed transaction, failures to commit on the mirror will not cause a transaction rollback on the principal".
But in this case the mirror will be inconsistent with the principal. How is this problem solved ?
Thanks in advance.
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Oct 16, 2006
Hi!
Is it possible to use teamed network adapters for Principal and Mirror in a quorum?
I need to use a VLAN networkconnection in order to setup a Synchronized Database Mirror with Witness session.
Thanks in advance!
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Jul 6, 2007
In documentation about SQL mirroring, the only thing about version requirement are that: 1) enterprise, standard, developer edition; 2) SP1 for official support
Is there any requirement for the Principal and Mirror SQL instances? For example, can one be Enterprise, the other one be Standard? Can one be SP1 and the other one be SP2?
It seems we are having some problem with the above scenario, not sure if that's supported..
Thanks!
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Nov 7, 2006
We were having problems setting up the mirroring, so I did it via command lines. I found out the "alter...set partnership" command works on the mirror server going to the principal, but gets a 1418 error when going from the principal to the mirror.
So if A is the principal and B is the mirror, A to B fails but B to A works.
If I reverse it so that B is the principal and A is the mirror, B to A fails and A to B works.
Any suggestions?
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Aug 10, 2015
I have checked my Production databases, both are went to Disconnected state, both are unable to connect to the application, i checked all the services and its working fine. and restarted the end points on Principal and Mirror, still issue not solved, after restart the witness server End point both the databases are working fine.
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Jan 31, 2008
After adding the Witness Server to the Mirror session, the Witness Connection state between the Mirror and Witness Connection is Disconnected and the state between Principal and Witness Connection is Connected.
The procedures defined in Books Online was used to setup Database Mirroring...when the Witness server was added to the Mirror session, only the alter database T-SQL statement was executed on the Principal server.
ALTER DATABASE <db_name> SET WITNESS = 'TCP://<servername>:<port>'
After executing the above statement, a few seconds later the state between Principal and Witness Connection changed to Connected and the state between Mirror and Witness Connection remains Disconnected.
The Mirror session is not using Certificates, every server is on the same domain, using the same domain login account, and all servers have SP2 installed running Enterprise Edition.
Any idea's why the state between Mirror and Witness Connection remains Disconnected?
Thanks,
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Apr 7, 2008
Sorry I didn't know the best forum for this question.
I have 3 SQL 2005 x64 servers on my remote domain.
10.1.10.65 is the primary
10.1.10.66 is the mirror
10.1.10.67 is the whitness.
All 3 machines run the MSSQLSERVER service as a domain admin user acount, and all of the other servies use LocalSystem.
All machines are configured to use the default instance name of MSSQLSERVER.
I have another seperate server ON THAT DOMAIN which runs IIS and ASP Classic.
I installed the SQL Native client on that machine.
Here is the ASP code:
-----------
<%
dim strConnString, objConn, rs, sql
strConnString = "Provider=SQLNCLI;Persist Security Info=False;User ID=sa;password=MyPassword;Initial Catalog=LCR;Data Source=10.1.10.65; Failover Partner=10.1.10.66"
sql = "SELECT * FROM DFW"
Set objConn = CreateObject("ADODB.Connection")
objConn.ConnectionString = strConnString
objConn.CommandTimeout = 300
objConn.Open
SET rs = Server.CreateObject("ADODB.Recordset")
rs.CursorLocation = 3
rs.Open sql, objConn
Do While Not rs.EOF
Response.Write rs(0) & "
"
rs.MoveNext
Loop
rs.close
objConn.close
set objConn = nothing
set rs = nothing
%>
--------------------------------
If I run this code on the server on the SAME domain and shutdown MSSQL services on the primary machine the Failover server starts working an serving data requests.
It I then take that code and run it from another REOMTE domain, I can connect to the primary server and get data, but when I force a failover for testing it refuses to connect the the MIRROR server.
In the error log on the primary server I see 12 errors.
There are 4 sets of the following 3 errors, as SQL will try to connect 4 times before failing.
1)
Date 4/7/2008 12:00:39 PM
Log SQL Server (Current - 4/7/2008 12:00:00 PM)
Source Logon
Message
Login succeeded for user 'sa'. Connection: non-trusted. [CLIENT: 10.1.3.79]
2)
Date 4/7/2008 12:00:39 PM
Log SQL Server (Current - 4/7/2008 12:00:00 PM)
Source Logon
Message
Error: 18456, Severity: 14, State: 16.
3)
Date 4/7/2008 12:00:39 PM
Log SQL Server (Current - 4/7/2008 12:00:00 PM)
Source Logon
Message
Login failed for user 'sa'. [CLIENT: 10.1.3.79]
Why does this work when the code runs on the LOCAL domain only when I'm connecting via SQL Security?
Thanks for any help.
John Rossitter
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Jun 28, 2007
Hello,
the Mirror Server is not connected to the Witness Server.
Mirror Server and Wtiness Server are instances on one server.
I get this error:
"
2007-06-28 17:08:12.77 spid23s The server instance Witness rejected configure request; read its error log file for more information. The reason 1451, and state 3, can be of use for diagnostics by Microsoft. This is a transient error hence retrying the request is likely to succeed. Correct the cause if any and retry."
In the SQL Profiler for the Witness Server I get "An error occurred while receiving data" Error 64.
In the witness server logs is nothing depending on this.
The connection between the witness and principal and the mirror and principal are all right. I have created User logins with certificates on the same way on all instances.
What can I do?
Greets
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Jun 14, 2015
I am using SQl Server 2012 Database Mirroring with around 40 gb as mdf and 1 gb as ldf. Now my ldf size increased . How to reduce ldf size while mirror enabled with mirror server and witness server. Can shrink the ldf with mirror enables.
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Dec 27, 2006
I was trying to test mirroring and now would like to delete the mirror database but it says I need to remove database mirroring first. I deleted the endpoint and cannot figure out how to remove the mirroring. Can someone please help.
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Oct 17, 2007
I'm getting the following error when launching the database mirroring monitor and attempt to connect to my database.
TITLE: Connect to Server
------------------------------
Cannot connect to dborat01.hs.pitt.edu.
------------------------------
ADDITIONAL INFORMATION:
SQL Server replication requires the actual server name to make a connection to the server. Connections through a server alias, IP address, or any other alternate name are not supported. Specify the actual server name, 'xxxxxx'. (Replication.Utilities)
------------------------------
BUTTONS:
OK
------------------------------
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Dec 6, 2000
Hi,
I have 2 DB as X and Y.
They are on 2 Servers A and B.
I am in need to create a stored procedure by getting a value from table1 in DB X on Server A and then use that value to get info from table2 in DB Y on Server B.
I am looking for a connection string to let me connect to DB X on Server A and DB Y on Server B.
Can anyone help!!!
Thanks.
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Dec 18, 2006
Hi
Windows XP Pro, SQL Server 2005 (Developer) & Visual Studio 2005 (Pro)
New SSIS project (Visual Studio)
New OLE DB/SQL Native client connection.
There's no servers available in the drop down box.
All the services that need to be running are running.
Guess I've missed the obvious here
Cheers
Dave
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May 8, 2006
Hello, Heros of The Programming World!
How it is possible to perform "replication" between two databases using technological means of MS SQL Server 2005 if two servers do not have a connection at all. The only thing is possible - is transfer of data for the replication on a CD.
What is the best way to do it if central database has a hundreds of such "subscribers"?
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Mar 1, 2006
When setting up an ODBC connection on a non-sql Server X and choosing from the drop down menu which SQL Server to connect to, I see two identical names for my SQL Server (Y). No matter which one I choose, Im not able to go to the screen after being asked how I want to log in (SQL server authentication)
If I build a ODBC connection from any other desktop, I only see one SQL Server Y, and am able to establish a connection to SQL Server Y, with the same user account and password as when Im on Server X.
Server X has two network cards and is teamed...could that be a possible problem ?
Any ideas ?...Thank you
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Jan 16, 2007
Being an IT consultant, I have to visit a number of customers having applications running on SQL Servers that implement trusted connection security model. In addition, all of these companies have their own DOMAIN settings, and security implementation.
How can I access to databases without changing the DOMAIN settings of MY notebook? I do not want them to switch to SQL security model, and I do not want to create any security hole in those companies.
What shall I want from the system administrator so that I can login into their domain without changing my domain settings?
Thanks,
EIO.
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Sep 29, 2006
Hi,
We currently have a test and development environment for our data warehouse which is using SSIS packages to build (SSIS packages call stored procedures). We have multiple connections accross the different packages. The problem that we are having is when we deploy the packages to the development environment, the connection strings in the packages are still pointing to the live server! Hence, when we run these packages in the test environment, they actually execute the stored procedures in our live server.
I have tried to use package configurations and the deployment utility to assist us in this regard but have still come up with a few problems:
- When running the deployment utility, I still have to go and manually type in the data source the connection string must use - Is there maybe a way to use some sort of a variable that will automatically set this dependant on the name of the server that you are deploying to?
-It seems, even when I deploy to my live server, if I change the data source to point to my live server, it goes and changes the data source for the packages on my test server to point to the live servesr as well/
Basically, what I would like at the end of the day is to just be able to select the server the packages must be deployed to, and the connesction strings must be set automatically to either the test or live server dependong on which one I deploy to. Anyone know if this is possible?
Thanks in advance
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Nov 14, 2007
What is the best way to run SSIS scripts on different servers without changing connection information. Our test server is ppntt140 and our production server is ppntd110. If I create a script on server ppntt140 what can I do so I can move it to server ppntd110 without changing any connection information? Database names are the same, it is just the server that changes. What is the best way to handle this? Thanks in advance.
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Nov 2, 2007
I was wondering if someone could help explaining how the SQL Server handles all incoming connections, I and a friend started a discussion about using the connection pool in ADO.NET or not in a specific case.
Usually when creating like an ASP.NET Page it's recommended to use the connection pool, because it optimizes the performance, by using already created connection, so we don't have to recreate the connection all the time. I have always thought that the connection in the connection pool had an open connection on the server. So 5 connections in the connection pool, would be 5 open connections at the server. But after having the discussion with my friend I am not so sure anymore.
Say that I would create a client application (.NET using ADO.NET) that connects to the database and work with that data. If I then have 1.000 clients and each client have a connection pool with 5 connections in it (I think that the default numbers for the connection pool), then there would be like 5.000 open connections on the SQL Server, where most of the connections actually never do anything more than hanging around and waiting... And then the connectionpool is not 1 per client but 1 per connectionstring.
So if my client scenario would access data from 2 different databases, there would actually be 10.000 open connections at the SQL Server. So now I think that there must be a server connection pool or something to handle the connection from the clients. So that there would only be like 10-50 open connections at the server for the 1.000 Clients that was connected.
How is it? Is there 1 open connection in the server for every connection in the connection pool? If that's the case, it would be better for the SQL Server if I don't not use the connection pool in the client, but instead open the connection when we need it, and then close it, and taking that little performance hit every time, to help the performance on the SQL Server.
Best regards
- Magnus
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Apr 18, 2008
I am having MSSQLServer2000 on Win2k and Win2k3 server.
i have to connect these servers from a application using JDBC driver and AD Authentication.
I have programmed all the things needed for AD authentication in my application(changed url , using integratedSecurity=true), and it is working fine when my application connects to MSSQLServer2k5 on WinXP(which is added to same domain of my application).
But when i try to connect MSSQL2000 server on Win2000 server it failes and gives error as follows.
Apr 18, 2008 12:39:51 PM com.microsoft.sqlserver.jdbc.AuthenticationJNI SNISecGenClientContextINFO: Failed to get the SPNcom.microsoft.sqlserver.jdbc.SQLServerException: Connection reset at com.microsoft.sqlserver.jdbc.SQLServerConnection.terminate(Unknown Source) at com.microsoft.sqlserver.jdbc.TDSChannel.read(Unknown Source) at com.microsoft.sqlserver.jdbc.TDSReader.readPacket(Unknown Source) at com.microsoft.sqlserver.jdbc.TDSReader.readPacket(Unknown Source) at com.microsoft.sqlserver.jdbc.TDSReader.readResponse(Unknown Source) at com.microsoft.sqlserver.jdbc.TDSCommand.startResponse(Unknown Source) at com.microsoft.sqlserver.jdbc.TDSCommand.startResponse(Unknown Source) at com.microsoft.sqlserver.jdbc.SQLServerConnection.sendLogon(Unknown Source) at com.microsoft.sqlserver.jdbc.SQLServerConnection.logon(Unknown Source) at com.microsoft.sqlserver.jdbc.SQLServerConnection.access$000(Unknown Source) at com.microsoft.sqlserver.jdbc.SQLServerConnection$LogonCommand.doExecute(Unknown Source) at com.microsoft.sqlserver.jdbc.TDSCommand.execute(Unknown Source) at com.microsoft.sqlserver.jdbc.SQLServerConnection.executeCommand(Unknown Source) at com.microsoft.sqlserver.jdbc.SQLServerConnection.connectHelper(Unknown Source) at com.microsoft.sqlserver.jdbc.SQLServerConnection.loginWithoutFailover(Unknown Source) at com.microsoft.sqlserver.jdbc.SQLServerConnection.connect(Unknown Source) at com.microsoft.sqlserver.jdbc.SQLServerDriver.connect(Unknown Source) at ChangePassword.process(ChangePassword.java:33) at ChangePassword.main(ChangePassword.java:14)
I am using following code for connection --
String url = "jdbcqlserver://172.16.1.243\dbaudit;portNumber=1034;integratedSecurity=true";
Class dbDriverClass = Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
Driver driver = (Driver) dbDriverClass.newInstance();
Properties props = new Properties();
conn=driver.connect(url, props);
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Aug 29, 2006
Hello,
I am starting to use SQL Server 2005. I am having trouble connecting remotely. I tried to enable the 'sa' user and got this error:
Cannot use the special principal 'sa'
Is the 'sa' user no longer valid for remote connections?
Thank you
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Jul 7, 2014
I have deleted a windows login user under security in SQL 2012 Management Studio. The users have also been removed from the associated databases. When I try to add back the login, I receive the message 'The server principal 'xxxx' already exists'. What do I need to do so that I can re-add the login ?
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Apr 19, 2008
I am trying to grant various users permissions and am using the following sql command
GRANT Delete ON Resident TO hector AS barbara
barbara is a member of the fixed server role sysadmin and has Delete permission on the Resident table.
I log in to the server as barbara and try and execute this command and get:
Msg 15151, Level 16, State 1, Line 1
Cannot find the object 'Resident', because it does not exist or you do not have permission.
If I just run
GRANT Delete ON Resident TO hector
then everything works fine but the grantor is then dbo. I want to be able to have it recorded that barbara was the one that actually gave hector permissino to delete on the Resident table. Is there a way to do this?
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Aug 8, 2007
I can successfully execute my package via Business Studio but when I schedule it in SQL Agent I get the error message, 'could not get proxy data for proxy id = 2.' I am trying to execute the scheduled job with that proxy (call it abcd_proxy) because I have a logon id (call it abcd) with access to a specific network drive folder, which holds a required source flat file. The abcd logon is defined as a sysadmin account. I am unable to see that the abcd logon id is an added principal within the abcd_proxy, which I think is because the abcd logon principal has a sysadmin role. My proxy id = 2 definition looks to be defined the same way that my first proxy id was.
Does anyone have an idea about what the message means and how I can fix it?
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Jan 4, 2006
I am using asynchronous mirroring. When I try to failover on the mirror server using €śalter database xxx set partner force_service_allow_data_loss€? (having disconnected the primary server from the network) it sometimes fails to failover (it reports that the database is not in the correct state to failover). I can re-connect the primary server, get them sync€™d again, then unplug the primary and it will failover ok.
Any ideas... or is this just an issue that will be fixed in the next SP?
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Jun 26, 2007
Hello,
In the ErrorLog of my Sql Server , i found this line :
2007-06-26 05:35:18.37 Serveur The SQL Network Interface library could not register the Service Principal Name (SPN) for the SQL Server service. Error: 0x54b, state: 3. Failure to register an SPN may cause integrated authentication to fall back to NTLM instead of Kerberos. This is an informational message. Further action is only required if Kerberos authentication is required by authentication policies.
Operating System XP Home SP2
SQL Server 2005 Express Edition with Advanced SP1 )
( idem for another workstation with XP Pro SP2 and same version of SQL Server 2005 Express
My problem is :
i want use the windows authentification but my computers are on Worhkgroup linked by a router ( no window server )
i have read that's possible to connect from a remote computer to a computer having a SQL Server 2005 Express through SPN
How can i do it ? ( activating NTLM ? but how ?)
I'm writing a C# program which must be executing on several computers with a SQL Server 2005 Express installed on a particular computer. These computers will belong to a domain of Windows Server 2003.
As i can't connect to this "normal" network, i am trying to simulate this network at home because i want to test this program and especially the possible locks problems.
I don't know whether i'm querying with the "correct" forum.
Sorry for my poor english.
I shall appreciate any help about this problem
Have a nice day
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Dec 14, 2006
Hi all,
I've got two VLDBs on 64bit hardware platform + 64Bit-W2003K Std R2 + 64Bit SQL2005 Std Edition.
If I set this guy up as the Principal, can I have the standby/member on 32Bit HW + 32Bit W2003 Std + 32Bit SQL2005?
Will this actually work?
Regards,
Uday Shivamurthy
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Aug 7, 2006
Hi,
Here is my testing environment:
Database server: SQL Server 2005 Developer Edition with SP1
Application: An application developed by Visual Studio 2005 using C# (.Net framework 2.0) and ADO .Net 2.0.
Principal server: computerA
Mirror server: computerB
Witness server: computerC
Mirroring mode: High availability with auto failover
Connection String:
Data Source=computerA;Failover Partner=computerB;Initial Catalog=test_mirroring;Persist Security Info=True;User ID=sa;
Code used for failover:
while (true)
{
thisDataSet = new DataSet();
try
{
thisConnection = new SqlConnection(connectionString);
thisAdapter = new SqlDataAdapter(SQL, thisConnection);
thisAdapter.Fill(thisDataSet, name);
break;
}
catch (SqlException e)
{
thisConnection = null;
thisAdapter = null;
thisDataSet = null;
}
}
Test Case:
(Part A) At the beginning of the test, computerA was in principal role. I started my testing application and connected to computerA without any problem. Then I disconnected the connection of computerA to the network by unplugging the network cable of computerA. The failover of database from computerA to computerB was carried out without problem. computerB was in principal role at that time. The application was pending for about 45 seconds and running again without problem. Then I re-connected computerA to network and it became the mirror server. computerB was still in principal role. Up to this point, all works fine, but the problem was coming next. (Part B) I disconnected computerB from network, database failover occurred, computerA became principal again. But my application cannot switch the database connection to computerA and then kept pending. Then, I re-connected computerB to network. It was surprised that the application switched the database connection to computerA successfully at that point.
My questions:
1. I think Part B is abnormal, isn€™t it? The application should be able to failover from computerB to computerA, because it works fine when failover from computerA to computerB.
2. Is there anything wrong in my code leads to the abnormal behavior of the application in Part B.
3. How can I achieve Part B? Any suggestion or idea?
Thanks for your attention.
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Dec 13, 2006
Is it correct to say
in any case exept when data or log file not available pricipal db will be availabe
and manual failover could be done only from from principal?
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