Hi,
I am new to DB mirroring and witness. For the purpose of learning, any one can suggest me like is there any posibility to do the DB mirroring and witness on 2 or 3 VHD Files. Basically, these VHD's are downloaded from microsoft website.
VHD's have W2K3 and SQL2K5 EE .
Please suggest me in this.
Regards,
Mohanraj Jayaraman
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?
Using SQL Server 2008, we would like propose mirroring between two servers of a critical database. Since we initiate, may require to clarify on its purpose and also required changes from application end.Any changes required from OS Level? (I believe both servers IP or Host name should be added in host entries. Mirroring ports should be allowed/open including Principal and mirror server IP Addresses): Windows Team.Any changes required from Application? (Instance name, authentication: user name and its password should be added in web config files): Application Team.Any changes required from Network Team?Also for mirroring both the principal and mirror servers should be with same version, does it only mean SQL Server 2008 versions are enough or does it also mean to say build numbers 10.00.4000 should also be same.URL....
View 5 Replies View RelatedI need to set up asyncronous data replication across two clustered instances of SQL 2012 across 2 Datacenters. Both the datacenters have a common domain however the vlans are different. There are only 3 small databases on the primary instance.
any issue in setting up mirroring in this case as vlans are different.
Operating system is Windows 2012.
Hi All
By mirroring I mean device mirror, since I do not think that there is a database mirror
We only have disk mirror. I also know that SQLServer 7.0 does not provide Mirror, unmirror or remirror. and for this we have to refer to Windows NT disk mirroring.
I need mirroring in both versions SQL Server 6.5 and 7.0
I want to have mirror on another server. I need this for tonight.
Sincerely.
I hereby let u know the steps that i undertook for performing mirroring
1. Created a database in Principal server named Mirror1 and one table named tblMirror1.( no values inside the table)
2. Repeated the same in Mirror in Witness
3. Selected the Principal server's database -->right click-->tasks-->mirror
4. from the left hand panel selected Options -->recovery model-->full
5. selected Mirroring from left hand panel-->configure secuirty-->entered mirror and witness name--Success
6. When I click on start mirroring I have an error stating
" Alter failed for database mirror1"
"Database mirroring cannot be enabled because Mirror1 database may have bulk logged changes that have not been backed up etc...."
7. followed this one
BACKUP database mirror1 TO DISK='C:Program FilesMicrosoft SQL ServerMSSQL.1MSSQLBackupmirror1_FULL.BAK'
got the answer as
Processed 160 pages for database 'mirror1', file 'Mirror1' on file 2.
Processed 1 pages for database 'mirror1', file 'Mirror1_log' on file 2.
BACKUP DATABASE successfully processed 161 pages in 0.318 seconds (4.147 MB/sec).
According to sources
Run a restore of this backup on your mirror.
This can be done through the GUI or using a T-SQL command.
The database restore must use the NO RECOVERY option, so the database stays in a loading state.
Also the database name on the mirror must be the exact same name as the principal
RESTORE TestMirror FROM DISK='C:Backup TestMirror_FULL.BAK' WITH NORECOVERY
Hence did the below
RESTORE database mirror1 FROM DISK='C:Program FilesMicrosoft SQL ServerMSSQL.1MSSQLBackupmirror1_FULL.BAK' WITH NORECOVERY
ERROR
Msg 3201, Level 16, State 2, Line 1
Cannot open backup device 'C:Program FilesMicrosoft SQL ServerMSSQL.1MSSQLBackupmirror1_FULL.BAK'. Operating system error 2(The system cannot find the file specified.).
Msg 3013, Level 16, State 1, Line 1
RESTORE DATABASE is terminating abnormally.
HENCE MODIFIED AS
use master
go
RESTORE database mirror1 FROM DISK='C:Program FilesMicrosoft SQL ServerMSSQL.1MSSQLBackupmirror1_FULL.BAK' WITH NORECOVERY
Msg 3201, Level 16, State 2, Line 1
Cannot open backup device 'C:Program FilesMicrosoft SQL ServerMSSQL.1MSSQLBackupmirror1_FULL.BAK'. Operating system error 2(The system cannot find the file specified.).
Msg 3013, Level 16, State 1, Line 1
RESTORE DATABASE is terminating abnormally.
========
Kindly let me know please where am i going wrong
Regards
cmrhema
hello
if i run dbcc dbreindex on a database thats the principal in a mirrored pair, will the mirrored database indexes also be rebuilt?
i am for the first time creating the database mirroring.I am moving the all the usr databases and everything from test server to a new server called test1.And from that new server i am restoring on the another new server called test2 for database mirroring.But in the test server , the transaction logs are backup for every 15 minutes.So in this case is there a need to move all the logs to test1 and then to test2 for mirroring?? or there is no need to move transaction logs to the new servers at all??
my secnario
------------
server1 server2 server3
-------- ------- --------
test test1 (moving everything from test) test2(mirror for test1 )
all the transaction logs are backup in test for every 15 minutes. so in this case , do i need to move the transcation logs from test to test1 and test2
or there is not need to move at all??
thanks,
Can anyone please tell me what mirroring is??
Thanks in ADvance
RKNAIR
I have sql server 2005 on my vista laptop.
When i set up database mirroring, do i have to set up Principle,
mirror and witness on seperate servers as well as seperate instances.
Or can i install 3 seperate instances on the same laptop im using and still use mirroring? I have tried to start mirroring with all three instances on my laptop but i receive an error.
Regards
Rob
Hi All,
I am trying to set up database mirroring and in the initial phase of database restoring im getting some problem.
the scenario is .
1- I create a TestMirror on server1(which will be principal server) and backup full and transaction logs.
2- create TestMirror in server 2( Which is going to be used as mirror) .
3- restore the full backup of "TestMirror" from Principle Sever with NORECOVERY option.
this step results in a message box showing that the restore was successfull...
but the database explorer( management studio) shows the TestMirror in (restoring ...) state. and no more operations can be performed with this Database. ( because the database is in restoring mode).. please help what this issue is?
Thanks In Advance for any suggestions
-- Krishna
hello
i used following query to create endpoint
CREATE ENDPOINT Endpoint_Mirroring
STATE = STARTED
AS TCP (
LISTENER_PORT=5024
, LISTENER_IP = ALL
)
FOR DATABASE_MIRRORING (
AUTHENTICATION = CERTIFICATE HOST_A_cert
, ENCRYPTION = REQUIRED ALGORITHM RC4
, ROLE = ALL
);
GO
i got the following error msg:
Msg 1498, Level 16, State 2, Line 11
Database mirroring is disabled by default. Database mirroring is currently provided for evaluation purposes only and is not to be used in production environments. To enable database mirroring for evaluation purposes, use trace flag 1400 during startup. For more information about trace flags and startup options, see SQL Server Books Online.
any help plzz
thanks in advance
Hello,
I have Microsoft SQL SERVER 2005 installed in my system.
To try out mirroring, I rightclicked on the database went to the tasks, but i found that in Status its written
"This database has not been configured for mirroring"
What shall I do now?
Hello Guys,
Can any one help I want SQL to email me when a database fails over I can find alerts for loads of thing to do with Mirroring but not to notify me when a database failover.
Thanks matt
How sql server will mirror big transaction ?
Example
inserting 10000000 rows in 1 transaction (columns big ,text data ...)
will it transfer data in multiple packets (size, location of temp file) to mirror ?
will it transfer data in 1 packet (size , location of temp file ) to mirror ?
Can you control transfer (size , location of temp file) ?
Thanks
Alex
Do you know if the following excerpt from technet is still true? I want to mirror a device over the net to another server. Has anyone tried this with sql server 6.5 or is it still not a feature?
----------------------
PSS ID Number: Q115043
Article last modified on 04-29-1997
4.2 | 4.2
OS/2 WINDOWS
================================================== ====================
----------------------------------------------------------------------
The information in this article applies to:
- Microsoft SQL Server version 4.2 for OS/2
- Microsoft SQL Server version 4.2
----------------------------------------------------------------------
The use of database devices accessed over the network is not a supported
configuration for either the OS/2 or Windows NT versions of Microsoft SQL
Server. All database devices, including mirrors, should be configured to
use local drives. Database dump devices are an exception to this
restriction.
----------------
Thanks.
Gail Wade
Raymond James and Associates
Clearwater, FL
gwade@is.rjf.com
I am testing out Synchronous Mirroring and have a question about failover. It seems the only way I can failover to the Mirror box is to log onto the Principal box and hit the Failover button? Is the whole point of mirroring to be able to handle the Principal not being available? Is there another way?
TIA, ChrisR
Hi All,
Does anybody know the OS requirements for Database Mirroring? I checked BOL and Google but couldn't find any info on that.
Thanks.
Hi All,
I have read on the web that high protection mode not recommended, except in the event of replacing the existing witness server. But I can't find the reason why anywhere. Can anybody explain? Thanks.
Hi All,
Couple of questions about database mirroing.
1. Once the mirroring is setup is it possible to switch between high-protection and high-performance modes? If it is will I have to stop the mirroring, switch the modes and then restart it again?
2. Let's say the principal server went down and I manually failed over to the mirror server. Mirror server runs as a new principal server for a couple of days and then I bring the original principal server back up. What needs to be done in order to bring transactions on the principal server up to date?
Thanks.
Hi,
I have place an question, but in some other place in the same forum.
My apologies for that
I wanted to implement mirroring
I hereby let u know the steps
1. Created a database in Principal server named Mirror1 and one table named tblMirror1.( no values inside the table)
2. Repeated the same in Mirror in Witness
3. Selected the Principal server's database -->right click-->tasks-->mirror
4. from the left hand panel selected Options -->recovery model-->full
5. selected Mirroring from left hand panel-->configure secuirty-->entered mirror and witness name--Success
6. When I click on start mirroring I have an error stating
" Alter failed for database mirror1"
"Database mirroring cannot be enabled because Mirror1 database may have bulk logged changes that have not been backed up etc...."
7. followed this one
BACKUP database mirror1 TO DISK='C:Program FilesMicrosoft SQL ServerMSSQL.1MSSQLBackupmirror1_FULL.BAK'
got the answer as
Processed 160 pages for database 'mirror1', file 'Mirror1' on file 2.
Processed 1 pages for database 'mirror1', file 'Mirror1_log' on file 2.
BACKUP DATABASE successfully processed 161 pages in 0.318 seconds (4.147 MB/sec).
According to sources
Run a restore of this backup on your mirror.
This can be done through the GUI or using a T-SQL command.
The database restore must use the NO RECOVERY option, so the database stays in a loading state.
Also the database name on the mirror must be the exact same name as the principal
RESTORE TestMirror FROM DISK='C:Backup TestMirror_FULL.BAK' WITH NORECOVERY
Hence did the below
RESTORE database mirror1 FROM DISK='C:Program FilesMicrosoft SQL ServerMSSQL.1MSSQLBackupmirror1_FULL.BAK' WITH NORECOVERY
ERROR
Msg 3201, Level 16, State 2, Line 1
Cannot open backup device 'C:Program FilesMicrosoft SQL ServerMSSQL.1MSSQLBackupmirror1_FULL.BAK'. Operating system error 2(The system cannot find the file specified.).
Msg 3013, Level 16, State 1, Line 1
RESTORE DATABASE is terminating abnormally.
HENCE MODIFIED AS
use master
go
RESTORE database mirror1 FROM DISK='C:Program FilesMicrosoft SQL ServerMSSQL.1MSSQLBackupmirror1_FULL.BAK' WITH NORECOVERY
Msg 3201, Level 16, State 2, Line 1
Cannot open backup device 'C:Program FilesMicrosoft SQL ServerMSSQL.1MSSQLBackupmirror1_FULL.BAK'. Operating system error 2(The system cannot find the file specified.).
Msg 3013, Level 16, State 1, Line 1
RESTORE DATABASE is terminating abnormally.
Please let me know what shuld i modify
regards
cmrhema
I think I've read some conflicting advice in BOL. Maybe someone can clarify it for me.
Under "Database Mirroring and Database Snapshots" it says:
"You can take advantage of a mirror database that you are maintaining for availability purposes to offload reporting. To use a mirror database for reporting, you can create a database snapshots on the mirror database and direct client connection requests to the most recent snapshot"
To my mind, to enjoy a noteworthy performance gain, that mirror database would need to be on another server.
But then you read under "Database Snapshots":
"Multiple snapshots can exist on a source database and always reside on the same server instance as the database."
So how do you get the snapshot to the mirror?
I have a quick question regarding mirroring failover. If you have mirroring setup with a witness and the principal server goes down, once the principal is back up as the mirror will it automatically synchronize with the new Principal?
The main thing that I wasn't sure of is that if it took a fair amount of time to bring the original principal back up, the new principal will be in production so will all the new transactions be sent to the mirror once it is available?
for a database mirroring , which stretergy is good.
Creating with witness server or without it.?
I am firsttime doing this , so i am posting it to the forum..
and also if we are creating the database mirroring with witness server for automatic failover , will the witness server need the same amount of harddisk space like the pricipal or mirror server.??
thanks
Hi,
We have 2 servers each having a domain (i.e. 2 domains) running
Windows Server 2003
Standard Edition
Service Pack 1
We would like to have one of the servers replicate/mirror the data on to the other but we are getting this error
The error produced from the mirroring part is:
TITLE: Database Properties
------------------------------
An error occurred while starting mirroring.
------------------------------
ADDITIONAL INFORMATION:
Alter failed for Database 'CTSM'. (Microsoft.SqlServer.Smo)
------------------------------
An exception occurred while executing a Transact-SQL statement or batch. (Microsoft.SqlServer.ConnectionInfo)
------------------------------
The server network address "TCP://UM_db_live.UMlive.local:5022" cannot be reached or does not exist. Check the network address name and that the ports for the local and remote endpoints are operational. (Microsoft SQL Server, Error: 1418)
Thank you.
we want to migrate our production server , without taking the database down.so what we did was , we mirrored the databases from production to one of our development servers and we took the prodcution server for uprgrade.
so today we are moving back (mirroring) all the databases from that development server to our new production server.
my question is , when i move
productionserver_old(principal server) - having the script for principal server
development server(mirror server---->principalserver)) - having the script for mirror server , which is now acting as principal server
new production server(mirror server) - having the script for mirror server. will become principal server , once i moved all the databases
now while mirroring between the developement server and the new production server, i have to run the scripts for the mirror server only.
so both the servers are havign the mirror script now...
is that a problem, or any other way i can handle this....
Guys, I really need a help . I have one database (1TB) on two servers in different location( About 1200 miles distance). SO which options will be good:
Clustering or Database Mirroring
I am totally confused . As i read from SQl-server- performance , Clustering doesn't protect data. It is server level.
Can any expert throw a light on me?
Hi All,
Does anybody know any good Tutorials for Database Mirroring (Automatic Failover) or Manual Sync with Mirror Server. I tried some sites online, but doesn't have detailed steps..
pls.help as i need to sync data with One of my Mirror using Sql Server 2005.
thanks
I'm currently looking at setting up database mirroring using SQL 2005 had a thought regarding automatic failover using a witness. We have an application that is provided by a third party, and it connects to the DB by referencing an ODBC connection set up on each individual machine.
My question is how will the application be able to connect to the mirrored DB in case of a failover? Would I set the ODBC connection to point to the witness?
We have a sql server 2000 sp3 server on a win2k3 server standardedition. This is on dell hardware with a dell scsi dasd enclosuredirectly attached. We want to duplicate the hardware and replicate ormirror the database to the backup server and do a manual or automaticfailover in case of outage(more than likely manual). Wondering rightnow if replication - with say software like doubletake - is preferredover sql database mirroring or vice versa. Thanks
View 1 Replies View RelatedDoes mirroring exist on sql2000?
Regards,
Randy.
Hi
I know there was a previous thread on setting up DB Mirroring and Clustering where DB Mirroring would failover first because its faster than clustering. But is there a way to set up servers to allow clustering to failover first and then use DB Mirroring failover if the cluster node fails.
thanks
P
I am setting up transactional replication on a database A with read only subscriber database B (for reporting purpose). I have also setup mirror on database A. I tried to manually failover to mirror...mirroring works fine but transactional replication is interrupted.
I have followed the steps as in article
http://msdn2.microsoft.com/en-us/library/ms151799.aspx
I have also used PublisherFailoverPartner parameter...but replication still complains that it cannot connect to publishing database.
Any ideas or direction is greatly appreciated.