Pause And Resume Mirroring

Dec 5, 2007



If we have a situation that the Mirror server is unavailable for a day....very unlikely, but it happens when servers are moved from one data center to another....Lets assume we are doing safety off (high performance mode)

Should we pause mirroring on the principal server?

When we pause, does the transaction log keeps growing ?
Can we backup the logs ?

If we don't pause mirroring

Does the transaction log keeps growing ?
Can we backup the logs ?

What we can expect we we bring online the mirror server next day! will there be any performanbce problems since mirroring will try to catch up....

Considering moving to mirroring from logshipping for our disaster recovery.

Thanks,


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Hello-

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3 try
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17
18
19 }
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26 }
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HTML Code:
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Server A = primary SQL DBs (mirroring origination)
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Hello All,



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3. Perform Post-load Tasks (stored procedure)



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I want to have mirror on another server. I need this for tonight.
Sincerely.

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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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Mar 13, 2007

hello

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Mar 27, 2007

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
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Nov 7, 2007

Can anyone please tell me what mirroring is??



Thanks in ADvance

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Regards

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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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