Simple Question About Database Mirroring...
Oct 30, 2007
Hi all,
I am a sysadmin (not a DBA by any means!), so just keep that in mind when answering
I was thinking to set up a database mirror with a manual failover for my Business Objects server. The question I have here, is the database name.. how is it kept?
I have three servers right now, all pointing to the same database. Let's call it DatabaseA. If I set up database mirroring (the links I've seen make it seem simple enough), and I fail over, what happens to the servers that have an ODBC entry to DatabaseA? Do I have to repoint them? Or is the identity of the server transferred over as well?
A little information on this would be greatly appreciated. Right now, we are using doubletake to copy over the database dumps on a constant basis, and I thought that database mirroring would be a better solution to my problem. Please let me know! I am quite new to database mirroring, so take it easy with me
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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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May 2, 2015
DB replication can set db recovery model to simple ,why db mirror can not db recovery model to simple.
DB mirror must be set to full recovery model.
As far as I know, whatever db mirror and db replication ,there is a log reader to read the log in the ldf file DB mirror and DB replication are almost the same principle to replicate the db to another db server.
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Oct 12, 2015
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....
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Dec 2, 2014
I have just finished configuring my first test mirrored environment (High safety mode). I setup the database engine service accounts on each of the servers with domainuser. I inherited a production mirrored environment set up by someone else. On the production servers the database engine service account is NT Authorityuser a local account. I am trying to practice installing Windows updates within a mirrored environment and I not sure how to proceed when the service account is NT Authority user account. should I change the service account to a domainuser?
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Jun 12, 2007
When I issue this command:
ALTER DATABASE foo set PARTNER = 'TCP://10.3.3.1:1234'
I get this error message:
The database is being closed before database mirroring is fully initialized. The ALTER DATABASE command failed.
What does that mean, and how do I fix it?
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Apr 2, 2008
I set up a new mirror server. Everything is good except that the Database Mirroring Monitor is not working for one of the databases. In the monitor the principal data is showing up as blank
If I look at dbm_monitor_data on the principal most of the data columns (e.g. Send_queue_size) are null where as they have data for the other databases.
Both servers are SQL Server 9.0.2047 Enterprise Edition.
Any idea what might be going on here?
Thanks in advance.
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Oct 12, 2007
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.
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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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Mar 12, 2008
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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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.??
thanks
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Jul 30, 2007
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....
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Mar 21, 2008
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
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Mar 14, 2008
Hi,
I have some questions about database mirroring. we have almost 40 databases in one server. Can I set up the database mirroring for all the databases. Is it going to any affect on performance. we have already setup the mirroring on almost 30 databases, and I need to set up for the rest of 10. please some body could help on this. Thank you.
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Jul 7, 2006
Hi,
i'm a novice of sql server and I have a problem.
I have to reply a server in which there are database that are managed with sql server 2000 sp3; what I must make in order to set up the mirroring between the database of the two server so that the data are always aligned ?
thanks for the attention
best regards
alessandro
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Apr 18, 2007
I am new user of SQl and preparing the exam database mirroring....can you tell me how i start the mirroirng ..what is my first tep..and is there only one instance
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Mar 12, 2008
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?
Thank you.
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Jan 4, 2008
Can we have database mirroring for two databases. Like i have an application where in the db used are two, namely DB1 and DB2, DB1 is used in the connection string and with the help of DB1 the tables and sps of DB2 are handled.
in this case can i go ahead with database mirroring. Please comment and give the idea or link on the same.
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Oct 25, 2006
Hi,
Is there a way to automatically mirror/backup a SQL Express database with a SQL Server 2005 licenced system?
They will be on seperate machines on the internet.
I have done manual backup and restores but would like to allow constant updates to allow both databases to be synchronized.
I read that the SQL Server 2005 version has a mirroring facility but I also read that this is not possible in the Express version.
What other (automated) options do I have?
Thanks Andrew
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Jan 30, 2002
Hello Everybody ..
Can anyone help me with some information or procedure as to how to mirror database devices in SQL Server 7.0 & SQL 2000 servers ?
SQL Server 6.5 has mirror utility built in the Enterprise manager .
Is there any way to do it on SQL 7.0 and SQL 2000 Servers ?
Any help will be appreciated .
Many thanks
Yatin.
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Mar 23, 2007
what are the different testing we can do for the database mirroring with witness and without witness ??
thanks
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Jan 24, 2008
Can 32-bit witness Server support 64 -bit Principle and Mirror Server? Please experts in database, i need advise.
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Nov 22, 2006
Can anyone offer some advice on how to reduce the size of a databaselog. The database is mirrored on another server using the logs. Thanks
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Jan 28, 2008
Hi Can Anybody help me what exectly is database mirroring? I am working in a small scale company. we have SQL server 2005 installed for a software used by our staff. Can any body expalin me what is mirrroring? how can i implements to my Database? What are the Basic Requirements? What are the Steps? Plz.. Thanks in advace who ever help me out for this......
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Dec 28, 2006
After reading about it, i'm still confused. Is replication and database mirroring the same? they seem to accomplish the same thing.
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Mar 16, 2008
I have setup database mirroring for one big database.But now Transaction log is full and server is down. What should i do? We do bulk-insert in that database.
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Feb 7, 2007
Hi
I have 3 server configured with mirroring. When the automatic failover occur, I use alter event generate by Sql Agent to rebuild user account (problem witch
orphan user). My application use multiple database and I set up mirroring to multiple database. A question is the order which database get up after automatic failover. When event occur all database are ready to use, or maybe one database get up and sql agent send me event , secound database get up and sql agent send me event. What is the order?
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Feb 26, 2008
I'm not personally a DBA or claim to be a database expert, instead I am a software architect who works closely with database architects and DBA's. I'm presently architecting a system where we will have a smart client used in both Europe and the United States from the same database instance.
The system is to be used for performance testing of devices and then the results will be available to management through the same smart client used by test engineers etc. The first release is operational in the United States today with Poland coming online shortly.
Today we are weighing our options between having cross-geo database mirroring or merely having the database server in the United States with application server level caching implemented in Poland and the United States.
The .net framework's Windows Communication Foundation is used with a netTcpBinding and the service layer is asynchronous with the reliableSession option enabled.
Does anyone have any feedback on whether you would go with cross-geo database mirroring or would you use local application servers with possibly some caching capabilities at that layer? Please also describe the benefits and any risks associated with each also...
Thanks in advance,
Doug Holland
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Mar 13, 2008
I am trying to mirror a database and I keep getting the error Msg 1469 saying that "Database mirroring cannot be enabled because the database is an auto close database on one of the partners. Well.. the database properties is saying "false" under auto-close. What else could be wrong?
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Jun 4, 2007
Ok i am very new to the word of mirroring in sql 2005, i am trying to get it to work, i have 3 servers
my witness server
mirror server and then of course the principal server, all are completely different servers.
I have a copy of the db on the princapal and the mirror server (excatly the same, snapshot)
right click on the princapal db and go to properties choose mirroring run through the' configure security' wiarzd
it resolves all my other DB server as it should. (using the same sql authentication also tried windows intergrated)
when i start the mirror i get unable to start
This database has not been configured for mirroring
what am i not doing???
how do i configure this damn thing?
thanks
Brad
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Oct 25, 2006
Hi
I'm looking at replicating our primary SQL server to a secondary offsite server (linked via 100Mb so effectively LAN speed). What are people's preference when deciding on a solution?
On the surface mirroring looks much better but having dug a little I've found it is recommended only 10 databases are mirrored per instance. That said, I've found a post from someone who is upto 58 databases mirrored. Are there similar limitations with log shipping?
Does anyone have any experience of mirroring and is using it in prefence to log shipping?
Our current recovery strategy is the classic restore the SQL dump from tape onto a rebuilt server so either method will be a vast improvement. None of our databases are mission critical that they need upto the second replication. 15 minute replication would be fine leading me to think that log shipping may be better given the possible limitations of mirroring
For recovery, I was considering amending the DNS records of the Database servers. Does anyone see any issues with this approach? I understand there is a automatic failure function if using mirror but this may require the application to be coded correctly?
Thanks in advance for any feedback
Robert
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Oct 3, 2006
Hello All Database Mirroring Experts,
I'm interested in how Combining Log Shipping and Database Mirroring works when failover occurs.
From SQL BOL, it says:
"Topic: Database Mirroring and Log Shipping
...
To run in high-safety mode with automatic failover the mirroring
session is configured with an additional server instance known as the witness.
If the principal database is lost for any reason after the database is
synchronized and if the mirror server and witness can still communicate
with each other, automatic failover occurs. An automatic failover
causes mirror server to assume the principal role and bring its
database online as the principal database. For more information, see Automatic Failover
[ http://msdn2.microsoft.com/en-us/library/ms189590.aspx ] . If the log
shipping backup location is accessible to the new principal/primary
server, its backup jobs begin to ship log backups to that location. The
database mirroring synchronous mode guarantees that the log chain is
unaffected by a mirroring failover and that only valid log is restored.
The secondary servers continue to copy log backups without knowing that
a different server instance has become the primary server.
..."
Source: http://msdn2.microsoft.com/en-us/library/ms187016(d=printer).aspx
Could anyone tell me that how the database mirroring synchronous mode guarantees that the log chain is
unaffected by a mirroring failover and that only valid log is restored?
Let me elaborate the situation (if anything I said is incorrect, please correct me )
Here is the time line of the failover happens:
------- tn-1 ---------- tn ---------- tf -------- tn+1 ---------------> t
----------------> t: the time line.
tn: the moment that the log shipping backup job and copy job is done for the transaction log obtained between the time interval tn-1 and tn.
tf: the moment that mirroring failover occurs in the database mirroring session.
the time interval between each tn and tn-1 are constant, say h seconds, for all n are positive integers.
Here is the question that I want to ask:
In database mirroring synchronous mode, it guarantees that all the committed transaction from the moment tn to tf is copied to the mirror database. All the transaction log backup for log shipping are done on the original principal before the moment tf. After the mirroring failover occurs at the moment tf, how the log shipping mechanism guarantees that the transaction log between the interval tn and tn+1 that can be unaffected by a mirroring failover?
That's the point that I interested in.
Thanks a lot,
Terence
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