Datbase Mirroring Issues

Jan 12, 2008

I am going to do database mirroring for. I need to configure what needs to be installed for mirror server and witness server with OS perspective. Does Mirror server have to have same hardware and software config as Principle server?
Thanks

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Help Need For Mirroring

Apr 1, 2008

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

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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,

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Nov 7, 2007

Can anyone please tell me what mirroring is??



Thanks in ADvance

RKNAIR

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I have sql server 2005 on my vista laptop.

When i set up database mirroring, do i have to set up Principle,
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Mar 26, 2008

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

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May 6, 2007





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

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Aug 22, 2007

Hello,
I have Microsoft SQL SERVER 2005 installed in my system.
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"This database has not been configured for mirroring"


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Oct 22, 2007



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,
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How sql server will mirror big transaction ?

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Sep 28, 1998

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
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restriction.
----------------
Thanks.
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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

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Does anybody know the OS requirements for Database Mirroring? I checked BOL and Google but couldn't find any info on that.

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Feb 27, 2008

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.

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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.

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Apr 1, 2008

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

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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?

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Jun 5, 2008

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?

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Mar 15, 2007

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.??

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