Mirroring :: 2012 Database Mirror Missing Witness Server Information?

Oct 24, 2015

missing witness server information and the fail-over is broken suddenly? 4:00am no maintenance job. I have one sql job on 10pm for backup on database transaction log only.

I can see the primary have problem then perform fail-over to mirror database, the auto fail-over was broken.

I re-build the sql mirror is OK , but i want to find the root cause.

Windows application event was full when there have many failed event, i have increase log size for application event.  

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Mirroring :: How To Reduce LDF Size While Mirror Enabled With Mirror And Witness Server

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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Problems On Database Mirroring (Loss Of Mirror And Witness)

Nov 29, 2006

Hi guys , I would like to know what's the exactly results able to get in this following scenario.

Server A : Principal

Server M : Mirror

Server W : Witness

1) Firstly, disable server M, following by server W. So probably i will unable to connect to Server A eventhough it acts as a principal.

2) Next, if I enable either server M or server W , what will I able to get actually ? Is it the mirroring works like the article which written in Microsoft page ?(http://www.microsoft.com/technet/prodtechnol/sql/2005/dbmirror.mspx#ETPAE)

At here, I get an error message and unable to continue the mirroring section. ( "Database EMS is enabled for Database Mirroring, but neither the partner nor witness server instances are available: the database cannot be opened." or "Database 'EMS' is being recovered. Waiting until recovery is finished." )

3) If I enable both server M and server W, the mirroring continue to work again.

Can I have any assistance on (2) issue? Thx for the assistance.

Best Regards,


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Mirror And Witness Connection In A Disconnected State Immediately After Adding Witness Server To Mirror Session.

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?


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Database Mirroring | Can Witness Live On Mirroring Server?

May 3, 2008

Server A = primary SQL DBs (mirroring origination)
Server B = failover SQL DBs (mirroring destination)

For database mirroring a witness is required.
Can the witness live in another instance of SQL on server B?

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SQL 2012 :: Mirroring In Two Servers With Witness?

Jun 19, 2014

One of my client asking mirroring between two server with witness.Is it possible witness and mirror in same server(with same instance)? OR Is it possible witness and primary in same server(with same instance) ? Best method to establishing mirroring with in two servers(with witness) ?

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Mirroring :: Migrate Mirror Database To New Server

Apr 14, 2015

I need to migrate my SQL server Mirror Database to a new server. my current setup is as below

1. server A principal (

2. server B Mirror     (

Now i have a new server (Server C) to replace server B as below

1. server A principal (

2. server C Mirror     (

My question is how to migrate mirror db to new server without any affect or downtime on principal server.

note: SQL SERVER 2008R2 EE(64BIT), Win2008R2 EE 64bit.

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2005 Database Mirroring && Witness

Mar 14, 2006

I'm devlving into 2005 and specifically mirroring.Having read the following article (http://www.microsoft.com/technet/pr...5/dbmirror.mspx ),is mirroring a sensible option as it indicates that it should not beused in a production environment, yet the SQL2005 seminars I've been toindicate that this is a worthy option.Do we also need a witness server, or can this be done (sensibly) withtwo SQL2005 servers ?Currently we have 2xSQL2000 (clustered) servers and a SAN for the data.If we go down the route of mirroring, it looks like we can get rid ofthe SAN and Cluster and use the mirroring instead.Any advice on the pro's / cons would be appreciated.ThanksRyan

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Witness Server Connection To Mirror Disabled?

Jun 28, 2007


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?


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Database Mirroring. Asp Application (IIS 6.0) Does't Forward Connections To Mirror Server

Mar 28, 2007


I have setup a database mirroring session without witness - ServerA is the principal, ServerB is the mirror,. Each SQL Server instance is hosted on its own machine on sql2005 EE SP2. The mirroring is working correctly. If I submit to server ServerA command:


, ServerB becomes the principal, it means that mirroring works correctly.

My issue is with the SQL Native Client and a front-end ASP application (actually IIS 6.0 site) that needs to make use of this database. I have setup my front-end application to use SQL Native Client and specified the failover server in connection string. Here is the connection string that I am using :

PROVIDER=SQLNCLI.1;Server=ServerA,1433;Failover Partner=ServerB,1433;Database=MYDBNAME;Network=dbmssocn;Integrated Security=SSPI;

Everything works perfectly on my front-end application when ServerA is the principal. If I execute on server ServerA command:


, ServerB becomes the principal, and the failover occurs correctly on the database side. The problem is that my front-end application is not able to query the database on ServerB. The error appears:

Microsoft SQL Native Client error '80004005'

Cannot open database "MYDBNAME" requested by the login. The login failed.

This behavior my appication till I unload IIS 6.0 pool application. After that my front-end application becomes work correctly with ServerB.

When I swap server, I execute on server ServerB command:


my IIS 6.0 application automaticly turn back to ServerA without any action on my side.

I am using SQL Native Client last version http://download.microsoft.com/download/2/7/c/27c60d49-6dbe-423e-9a9e-1c873f269484/sqlncli.msi (issued in February 2007). Has anyone experienced this issue? I'm thinking that it's a problem in the SQL Native client

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Witness Server In DB Mirroring

Jan 28, 2008

Can 1 witness server work for 4 Principal and mirror servers?
Needs expert advise.

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Mirroring The Databases Without Witness Server?

Jul 10, 2013

I need to start mirroring the databases without witness server.

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Mirroring :: Unable To Add Witness Server

Sep 14, 2015

I am unable to add witness server to my mirror configuration. my error log is throwing error'Connection handshake failed. The certificate used by the peer is invalid due to the following reason: Certificate not found. State 89'.

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Mirroring Mirror Database

Jun 13, 2007

I have two questions here.

Question 1:

If I am using Database Mirroring for my production database in SQL Serever 2005, can I do mirroring on the mirror database?

Principal Database -- Mirror -- Mirror A -- Mirror -- Mirror B

Can this be done?

Question 2:

Can I do 2 mirroring on a single principal database? If can, which mirror database it will goes when the failed over happen? can the other mirror switch to mirror the failed over database?

Principal Database -- Mirror -- Mirror A

-- Mirror -- Mirror B

Please advise. Thanks

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Database Mirroring Using Certificate? (two Principles And One Mirror)

Dec 22, 2006

Hi, all.

here is the situation.

we designated one server as a mirrored server. this server will host all mirrored databases from different principles in different server using certificate.

1) Server A (Principle) Server B(Mirrored)
2) Server C (Principle) Server B(Mirrored)

I was able to set up mirroring between A and B. But unable to set up mirroring between C and B.
My question is "Can I grant connect on endpoint to two different host logins?"

For example, on the server B
I created two different logins for Server A and C in order to assign different certificates to two principle servers.

For Server A.
create login server_A_login with password = 'djkkajnxks';
create user server_A_user for login server_A_login
create certificate server_A_cert
authorization Server_A_user
from file = 'c:certificateserver_a_cert.cer'

GRANT CONNECT ON ENDPOINT::Endpoint_Mirroring TO [server_a_login];

For Server C.
create login server_C_login with password = 'djkkajnxks';
create user server_C_user for login server_c_login
create certificate server_c_cert
authorization Server_c_user
from file = 'c:certificateserver_c_cert.cer'

GRANT CONNECT ON ENDPOINT::Endpoint_Mirroring TO [server_c_login];

when I set up like this and try to start mirroring, I am getting error from server c saying, "the network tcp:serverb.corp.com can not be reached or does not exist"

But mirroring between server a and b is OK. I set up them first, then between c and b.

any ideas?


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Mirror Database Is Not Accessible When Mirroring Is Stopped.

Apr 23, 2006


I've a very basic doubt about database mirroring. I did setup a database mirroring session with the help of SQL Server Management Studio between the server A (db1) and B(db1). When is stop database mirroring by using the command button "Stop Mirroring" available in the mirroring page of SQL Server Management Studio , the mirror database{ B(db1) } goes to state "Restoring...". After stopping the mirroring i'm not able to access the mirror database.

Can you please tell me how to bring mirror database B(db1) to operation mode so that we can start working with that database?



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Mirroring :: Authentication Failing For Mirror Database

Aug 24, 2015

When I try to setup mirror on a SQLserver dbase using windows Authenticated login I get error:-

Login failed for user 'SERVERBAdministrator'. (Microsoft SQL Server , Error: 4060).The login connect string however on selection of SERVERB from SERVERA has a greyed out option for using Windows Authenticated login which clearly shows Username: SERVERAAdministrator.It is odd that the error coming back is showing SERVERBAdministrator on the rejection. (somehow the machines got swapped over in the authentication) The strange thing is if you use the SQLserver studio on SERVERA to connect to SERVERB using the object browser and Windows authenticated login it all works fine without errors. clearly the Mirror software is using some other means/privs of login to establish the connection.

The two machines SERVERA and SERVERB are in the same Domain (DOM1) but they are not using a domain user account.They are using Administrator user on both independent machines. The SQLSERVER install specified both Windows and sqlserver logins. The mirror is to use Windows authenticated login.Is there some login priv we are missing The sqlserver security has allowed this type of login......

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Recovery :: Where To Place Witness Server For Mirroring Using High-safety And Auto-failover

Apr 9, 2015

We have 2 data centers, site 1 and site 2.  Site 1 is generally our primary, and site 2 is our Disaster Recovery (DR) site.  I want to setup a SQL instance to have extremely high availability.  Therefore I was looking at using DB mirroring, with synchronous data writing, high-safety and auto-failover.  This requires the usage of a witness server.My problem with this setup, is that if the witness and principal are both at site 1, if site 1 goes away (power failure, asteroid impact, lol, anything else that would be a *true* DR scenario), then there is no failover to the mirror server at site 2.   However, if you put the witness at site 2, anytime the WAN link between site 1 and site 2 has an issue, the DB will auto-failover to site 2.  Is the reason for the recommendation of the witness being at the primary site because the thinking is that WAN link failure is likely more common than a *true* DR scenario that takes out all of site 1?

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To Configure Database Mirroring-Dont Get Mirror Option In TASK

Jul 7, 2006

To configure database mirroring

After connecting to the principal server instance, in Object Explorer, click the server name to expand the server tree.

Expand Databases, and select the database to be mirrored.

Right-click the database, select Tasks, and then click Mirror. This opens the Mirroring page of the Database Properties dialog box.

To begin configuring mirroring, click the Configure Security button to launch the Configure Database Mirroring Security Wizard.

but i do not see any "Mirror" Option in the "Tasks" menu.

Why ?

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Mirroring :: Can Database Mirror Configured On Single Stand Alone Installation?

Jul 15, 2015

I want my database to be mirrored . is it possible to mirror it on the same machine.

I have tried to create a named instance but while trying to configure its not visible.?

Am using SQL SERVER 2008

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Mirroring :: Store Transaction Log File / When Create Mirror Database

Nov 27, 2008

When Create Mirror Database Server, Where need to store the Transaction Log backup file?I took FULL Backup of my Primary Database, and I restored at my Mirror Server also. When I try to create a Mirror Database."The remote copy of database "<db_name>" has not been rolled forward to a point in time that is encompassed in the local copy of the database log. (Microsoft SQL Server, Error:1412)".I am misplacing the Transaction Log backup file. Where I need to store that file?

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Unable To Add Witness To DB Mirror Error 1456

May 9, 2007

I can establish the mirror with the principal and mirror but cannot add the witness (error 1456) all machines are SQL Server 2005 standard edition service pack 2 principal and mirror are windows server 2003 and witness is windows xp

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Missing Feature In SP2 Database Mirror Monitor

Mar 29, 2007


I've been running SQL 2005 Enterprise SP1 for some time. After installing SP2, I miss the "Database Mirror Monitor"-Feature. Where is it? Did MS kill the feature?


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SQL Server 2012 :: Mirror Database - Create Stored Procedure

Nov 5, 2014

I have a database which uses "Database Mirroring", and I need to write stored procedure and pull data from "Principal Server".

My Current Logic:

IF Server01 = 'ONLINE'

[Code] .....

The problem I am facing is: Stored procedure is not created because "One of the server is not Online"...

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SQL Mirroring Witness

Sep 14, 2006

I have managed to set up mirroring on SQl 2005 however i have a come across a problem that i dont know how to resolve.

Im running the mirroring with 'High Safety with automatic failover.'

If i instagate a failover on the Principal Database, the mirror becomes the Principal, and vice versa ... great .. how ever .. i tried the golden test by making the principal server dissapear by yanking out the network connection, expecting the mirror to become the principal.....nope it just stays there in a disconnected / restoring state which isnt any good to man nor beast . I thought that the Witness should have dectected that the principal database had 'dissapeared' and would have made the mirror the Principal.

Any pointers on where i might have gone wrong in the setting up process, i used the mirror wizard

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Missing Information From Database

Aug 14, 2007

I have a serious problem with either SQL Server or SQL Reporting Services. I have 7 tables in a database that are relational. I have created serveral reports against this database. Last week when I pulled one of the reports, I was missing information on one of the cells. The reason why I know this is because my boss has us verify the report against the database. That took about an hour to complete. When we found that the report was not correct I repulled the report and the cell that was empty, was now populated. What gives? This is the same report I have pulled for the last month and had no problems until now. Is there a time issue involved between the last update to the database to the time I pull the report? Or maybe there is something wrong with the query?

SELECT Lease.[Lease #], MineralContacts.[Mineral Owner First Name], MineralContacts.[Mineral Owner Last Name], Tract.County, Tract.[Tract Number],
Tract.[Tract Description], Tract.Section, Tract.Block, Tract.Survey, Tract.Abstract, Lease.[Lease Date], Tract.[Title Check Though], Tract.[2ndTitleReview],
Tract.[2nd R/S Complete], Tract.[Title Agent], Tract.[Tract Gross Acres], SubTract.[Tract Net Acres], Draft.[Draft Status], Draft.[Draft Due Date],
Draft.[Draft Amount], Draft.[Draft #], Draft.[ANB Invoice #], Draft.[Lse File Sent to CP], Draft.[Money Wired from CP to EA],
Draft.[STA Approved Draft for pmt], Draft.[STA Recommend to Return Daft], Draft.[KE Advised ANB to Pay Draft], Draft.[KE Advised ANB to Return Draft],
Draft.[Paid Draft Recd], SubTract.Comments, SubTract.Hide
SubTract ON Tract.TractID = SubTract.TractID INNER JOIN
Mineral ON SubTract.SubTractID = Mineral.SubTractID INNER JOIN
Lease ON Mineral.MineralID = Lease.MineralID INNER JOIN
Draft ON Lease.LeaseID = Draft.LeaseID INNER JOIN
MineralContacts ON Mineral.MineralID = MineralContacts.MineralID
WHERE (Draft.[Draft Status] IS NOT NULL) AND (Draft.[Draft Due Date] IS NOT NULL)

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Mirroring :: Unable To Drop Endpoint With Name Mirror Server

Jul 16, 2015

I have created a Endpoint with "Mirroring Server" on the mirroring instance. Due to the keyword server i am not able to drop the endpoint now.

Also am not able to configure a mirror in a windows workgroup also( the two systems principal and mirror are under same network ). I have followed many ways as per msdn articles and other blogs.

I am not able to connect to the mirror server. 

I have tried giving the ip addr and the port no, also the computer name:port no, computername.local:port no etc. Both the systems are running on sql server 2008 only

I always get the error as Connection cannot be established to the destination.

(I have also enabled the ports in firewall by creating inbound and outbound rules)

The issue probably lies in NAMING server address i guess.

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Mirroring Causing Processor Load On Mirror Server

Jan 4, 2008

Hi everybody,
I have a mirroring set up for around 30 databases in a 64 bit - 2 powerfull servers scenario - wih latest sp2 + hotfix. Mirroring works perfectly most of the times but when the principal is getting busy during the busy period of the day all of a sudden the processor on the mirror jumps to 100% and stays there for a long time - there are no live databases on the mirror server - all the databases are in mirrored mode. The principal server processor is less than 5% all the time. The network load between the principal and the mirror is also in normal limits. The principal server is dedicated to SQL but the mirror has other things too but the other processes use up maximum 15-20% of the CPU and when I stop SQL Server in one of those moments when the CPU jumps to 100% everything comes back to normal so it's clear that the issue is SQL on the mirror.
Any ideas would be greatly appreciated.


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SQL Server 2012 :: Extract Locking Information In Database

Jul 16, 2015

I am using following sql to extract locking information in database. It only work on current selected database, how can I tune to work on all databases and not only currently selected?

ES.login_name AS LoginName,
L.request_session_id AS BlockedBy_SPID,
DATEDIFF(second,At.Transaction_begin_time, GETDATE()) AS Duration_Sec,
DB_NAME(L.resource_database_id) AS DatabaseName,

[Code] ....

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SQL 2012 :: Creating Snapshot From Mirror Database Failed - Could Not Redo Log Record

Sep 1, 2015

Process to create snapshot failed (twice per day snapshot of the database is being created for some people to work on). Morning snapshot worked fine but the afternoon one failed. The snapshot is being created from Mirror database. I used this code:

(name = N'DB',filename = N'D:SnapshotDB.SQLSnapshot' )
,(name = N'indexes',filename = N'D:SnapshotDB_indexes.SQLSnapshot' )

And the error message i get

Msg 1823, Level 16, State 6, Line 1
A database snapshot cannot be created because it failed to start.
Msg 1823, Level 16, State 7, Line 1
A database snapshot cannot be created because it failed to start.
Msg 3456, Level 21, State 1, Line 1
Could not redo log record (202011:19306:2), for transaction ID (0:0), on page (1:1823948), allocation unit 281474979397632, database 'DB_snapshot' (database ID 6). Page: LSN = (201954:220201:1), allocation unit = 281474979397632, type = 1. Log: OpCode = 4, context 18, PrevPageLSN: (202010:23679:1). Restore from a backup of the database, or repair the database.
Msg 3313, Level 21, State 1, Line 1

During redoing of a logged operation in database 'DB_snapshot', an error occurred at log record ID (202011:19306:2). Typically, the specific failure is previously logged as an error in the Windows Event Log service. Restore the database from a full backup, or repair the database.

What might be causing this error? Mirroring seems to be working OK. status is "Synchronized"

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Mirroring :: 2008 R2 Failing Over Of Mirror

Oct 13, 2015

I have three win2k8 r2 servers.  2 are running SQL 2008 r2 and are mirrored. The 3rd server is a witness server. Every so often we get errors and failovers of the mirror. The communication errors are between the witness server and sql servers. No errors between SQL servers. There seem to be no network issues and happen randomly. 

Event id 1474 and 1479. 
The mirroring connection to "TCP://witnesssrv:5022" has timed out for database "DB" after 30 seconds without a response.  Check the service and network connections. 
Database mirroring connection error 4 'An error occurred while receiving data: '64(The specified network name is no longer available.)'.' for 'TCP://witnesssrv:5022'.

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Header Information Is Either Corrupted Or Missing. While Synchronization Between SQL Server 2000 &&amp; SQL Server CE 2.0

Jun 30, 2007

I am stuck while doing synchronization between SQL Server 2000 and SQL Server CE 2.0.
getting an Error "Header information is either corrupted or missing."

My Specification is follow :
Windows XP with SP2
Visual Studio 2005 Enterprise edition
SQL Server 2000 (SP3a)
SQL Server CE 2.0
Application is Smart Device application (Pocket PC 2003) using C#.
Microsoft ActiveSync 4.5
IIS 5.1

I followed steps as per given in this URL :
http://msdn2.microsoft.com/en-us/library/ms839425.aspx#sql_serverce_replication_net_topic2I performed eeach steps successfully, My code is as per given below.

private void button1_Click(object sender, EventArgs e)

SqlCeReplication loSqlCeReplication;
private void getSyncReady()
String lsDBFile = "Northwind.sdf";
loSqlCeReplication = new SqlCeReplication();
loSqlCeReplication.InternetUrl = "";
loSqlCeReplication.Publisher = "C99";
loSqlCeReplication.PublisherSecurityMode = SecurityType.NTAuthentication;
loSqlCeReplication.Publication = "NorthwindProducts";
loSqlCeReplication.PublisherDatabase = "Northwind";
loSqlCeReplication.Subscriber = Dns.GetHostName();
loSqlCeReplication.SubscriberConnectionString = "Data Source=" + lsDBFile;
if (!System.IO.File.Exists(lsDBFile))
MessageBox.Show("The application requires synchronization", "Replicator",
MessageBoxButtons.OK, MessageBoxIcon.Asterisk, MessageBoxDefaultButton.Button1);
catch (Exception foException)
throw foException;

I am not getting whats going wrong.
My Firewall is disable and i have not installed any antivirus softwares (including Norton internet Security....in many forums i got this suggestion but i think its not an issue,even though for solving this issue i performed new installation of Windows XP SP-2 )

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Mirroring :: Combined With Cluster And Asynchronous Mirror

Jun 1, 2015

I have configured active passive cluster in production environment. And we also have a dr which we have configured with asynchronous mirroring with no witness. Currently active node(node

a) is in sync with dr. When failover happens and the second node(node
b) becomes active, the mirror is broken and goes to disconnected mode.

But when we failback again to node a mirror is connected again and is in sync again. In our setup we have active passive cluster and a standalone server as dr.

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