Backup Mirroring Database or Recovering database
Hi All,
First, I apologize for posting this in two different palces. I have posted here but no response and I think this is a better place to post.
SQL Server 2012 - Windows 2008 R2.
Can you backup a mirroring database (Not the primary database but the one in mirroring partner) when it is in "suspend mirroring" state or "Disconnected" state or any other state ?. The idea is to backup the database on mirroring partner
before DR (Disaster Recovery) test (before putting the database online) then have the test be done than restore the database from the previous backup to continue with the mirroring without copying the primary database Full-Differential-TRN log backups again
from primary and establishing the mirroring again. Thanks for any input.
Can't use Availabilty groups due to the network setup. I am looking for a solution wher I don't have to copy large backup files (Full + Diff + TRN) after the DR test to re-establish the mirroring again.
Why would you have to take full and log backup again. No need to take diff backup at all. If mirroring fails when you try to configure it fist time try to find out reason why it failed you don't require to restore full backup again.
Hope I can understand what you are saying
Please mark this reply as answer if it solved your issue or vote as helpful if it helped so that other forum members can benefit from it
My Technet Wiki Article
MVP
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Hi Please correct me,
backup of mirror database is not possible right?
Thanks
Shashikala
ShashikalaHi Shashikala,
While a database mirroring session is active, the mirror database is in a recovering state and it is not accessible. Thus as Ashwin’s post, backup and restore of the mirror database is not allowed. In addition, you need to note the following things:
•Backup of the principal database is allowed, but BACKUP LOG WITH NORECOVERY is not allowed.
•Restoring the principal database is not allowed.
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Database Mirroring and Backup and Restore.
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I can open rman
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Guys looking for some help, I have an Oracle database that must run 24hours a day but I need to be able to back this database up daily, from what I understand I have to make the database run in archive log mode to be able to perform a hot backup.
I have found out that currently my database is in noarchive log mode
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Is backup full database , is backuing up controlfile ?
Hi
i am on 8174
is that enough to cold backup the database?
shutdown immediate;
startup mount;
run {
allocate channel t1 type 'SBT_TAPE';
send 'NB_ORA_POLICY=....';
backup full format 'bk_%U_%t' (database);
or do i need
backup current controlfile; ?
i can see here http://download-west.oracle.com/docs/cd/A87860_01/doc/server.817/a76990/rmanconc.htm#436070
this statment "A full backup is different from a whole database backup, which is a backup of all datafiles and the current control file."
is that means
backup full database , is backuing up controlfile ?(i think yes) and is restoring from it requires any archivelogs?(i think no)
Thanks very much
Edited by: user9145417 on 25-Aug-2010 16:42The reason to have the current controlfile is that it keeps all the information of the database. If you lose the entire machine, it will be much more difficult to recover to another machine without that controlfile. That is one reason that control files are multiplexed, so that you do not lose all of them.
With 8174 I don't believe there was a method to always included it automatically like with 10g. So yes...always backup your control file with an exact statement.
Will you need archive logs? If you want to do a complete recovery you will need all the archivelogs that occur after the start of the backup untill the time the database crashes.
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Regards
Tim -
How to Increase database / log size of mirrored database
Hi All,
I have been asked to increase the default database and log size of two databases, both of which are mirrored.
I have been trying to find out what else I need to do in this case other than the standard resizing.
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FROM sys.database_mirroring
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1. Check the mirroring configuration and partner status with above query.
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Reference:
Increase the Size of a Database
How to add a database file to a mirrored SQL Server database
Thanks,
Lydia Zhang
Lydia Zhang
TechNet Community Support -
Hi folks,
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Hi Board,
i´ve search across the board, technet and symantec sites but did not found a hint about my problem.
we drive a 2 node DAG (Location1-Ex1-mb1
Location2-exc1-mb1), on SP2 RU4 patchlevel with 40 Databases.
Since some time the backup of one - and only one DB - is failing with these events, logged on the Mailboxserver on which the passive DB is hosted.
Log Name: Application
Source: MSExchangeRepl
Date: 28.09.2012 00:37:17
Event ID: 2112
Task Category: Exchange VSS Writer
Level: Error
Keywords: Classic
User: N/A
Computer: Location1-Exc1-MB1
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Log Name: Application
Source: MSExchangeRepl
Date:
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Event ID: 2024
Task Category: Exchange VSS Writer
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Keywords: Classic
User:
N/A
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aren´t removed in a proper manner?
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BR
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I´ve encreases VSS / Exchange Backup Log levels to expert, before starting
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All those attempts failed.
But brought some more details - the backup against the active DB states, that there is still a backup in progress and therefore this backup is cancelled by VSS.
The Solution was, that i´ve needed to restart the Exchange Replication Service on the Mailbox Server hosting the passive DB.
Backups are working again on all DBs!
THX for your replys.
Best regards
Markus -
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We learn a lot every day on these Expert Forums !
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Dear Developers,
Greetings Of The Day !!!
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I try: http://technet.microsoft.com/en-us/library/hh758162.aspx
To back up the DPM database
On the computer where your DPM database is located, do one of the following:
If the DPM database is on the DPM server
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and this not working:
C:\Program Files\Microsoft System Center 2012 R2\DPM\DPM\bin>DpmBackup.exe -db
DpmBackup 1.0 - Data Protection Manager backup command-line tool
Copyright (c) 2013 Microsoft Corporation. All rights reserved.
Error: Invalid command -db.
Description:
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... deleted
where is problem ?Add "instanceName" and "dpmdbname" parameters, like this: DpmBackup.exe -db -instanceName "<SQLInstanceName>" -dpmdbname <DPMDB_NAME>
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Mirror Database shows Recovery state in Database mirroring in sql 2012
Hi I am working on DBmirroring and have encountered problem of mirror database showing recovery state.
I tried to resolve issue by removing database mirroring from principal ,removing endpoints from both the nodes and
finally firing alter database db1 set partner off statement also.But when reconfigure dbmirroring on principal it does not allow
start dbmirroring and mirror database db1 comes in to recovery state from restoring stage.
srm_2010ok in that case why it is not allowing me to configure db mirroring when I am trying from SSMS.It gives an error.tell me????
srm_2010
And what is the error ? If while configuring mirroring it fails for some reason you have to make sure the mirror database which has gone in recovery state needs to be brought in restoring state.
Please mark this reply as answer if it solved your issue or vote as helpful if it helped so that other forum members can benefit from it
My Technet Wiki Article
MVP -
Maximum Number of Mirrored Databases Decreases as Number of Available Cores Increases?
Hi,
I wonder if you can help me. We're planning a large in-house mirroring deployment and are concerned we may (at some point) run into the limits described in the following KB article:
http://support.microsoft.com/kb/2001270/en-gb.
Based on the formulas contained within the above article, I knocked up a quick spreadsheet to see how increasing the number of cores might allow us to increase the number of mirrored databases. However, to my surprise, my calculations imply that as you increase
the number of cores, the number of databases you can potentially mirror decreases?
No. of Logical Cores
Max Worker Threads
Threads Required per Mirrored Database
Max. No. of Databases that can be Mirrored
4
512
3
170.6666667
8
576
4
144
12
640
5
128
16
704
6
117.3333333
20
768
7
109.7142857
24
832
8
104
28
896
9
99.55555556
32
960
10
96
64
1472
18
81.77777778
Am I missing something here? Have a miscalculated somewhere? This seems counterintuitive.
Regards
AndyHi rushandy,
As the KB post, we need to calculate the max worker threads, which is default no. of worker thread SQL Server will spawn. about database mirroring requirements for worker threads, we need to calculate the number of threads required per mirrored database.
At end,
maximum number of databases that can be mirrored = the max worker threads/ the number of threads required per mirrored database.
As your post, for 64 bit architectures, if the number of logical CPU cores is 16 on the mirror server, after calculating , maximum number of databases that can be mirrored is 117. However, in actual scenario, the mirroring databases is less than 117, or
else, it will cause some errors, such as error 17884 and so on.
Usually, not all worker threads would be available to perform mirroring activities as some threads are assigned to core database activity on the server. For more information, see：http://sqlknowledgeshare.blogspot.com/2012/02/do-you-know-maximum-number-of-databases.html
Regards,
Sofiya Li
Sofiya Li
TechNet Community Support -
Powershell SMO SQL Server Mirror Databases
Hello,
I am almost done writing a script to help my team manage mirrored database during planned outages. I would like to do determine the role of the database (principal or mirror). If I query atheDMV sys.database_mirroring, I am able to determine the
role of the database by looking at the mirror_role and mirror_role_desc columns.
http://technet.microsoft.com/en-us/library/ms178655(v=sql.110).aspx
Since I am using SMO objects I looked for their equivalents, but I could not find any.
http://msdn.microsoft.com/en-us/library/Microsoft.SqlServer.Management.Smo.Database_properties.aspx
Does anyone have any idea where I could find/determine this information using SMO?
Thank youIf you must you can use this.
http://stackoverflow.com/questions/10091613/powershell-to-find-the-principal-mirror-in-sql-servers
¯\_(ツ)_/¯
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