2005 Database Mirroring && Witness
Mar 14, 2006
I'm devlving into 2005 and specifically mirroring.
Having read the following article (
http://www.microsoft.com/technet/pr...5/dbmirror.mspx ),
is mirroring a sensible option as it indicates that it should not be
used in a production environment, yet the SQL2005 seminars I've been to
indicate that this is a worthy option.
Do we also need a witness server, or can this be done (sensibly) with
two SQL2005 servers ?
Currently we have 2xSQL2000 (clustered) servers and a SAN for the data.
If we go down the route of mirroring, it looks like we can get rid of
the SAN and Cluster and use the mirroring instead.
Any advice on the pro's / cons would be appreciated.
Thanks
Ryan
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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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Nov 29, 2006
Hi guys , I would like to know what's the exactly results able to get in this following scenario.
Server A : Principal
Server M : Mirror
Server W : Witness
1) Firstly, disable server M, following by server W. So probably i will unable to connect to Server A eventhough it acts as a principal.
2) Next, if I enable either server M or server W , what will I able to get actually ? Is it the mirroring works like the article which written in Microsoft page ?(http://www.microsoft.com/technet/prodtechnol/sql/2005/dbmirror.mspx#ETPAE)
At here, I get an error message and unable to continue the mirroring section. ( "Database EMS is enabled for Database Mirroring, but neither the partner nor witness server instances are available: the database cannot be opened." or "Database 'EMS' is being recovered. Waiting until recovery is finished." )
3) If I enable both server M and server W, the mirroring continue to work again.
Can I have any assistance on (2) issue? Thx for the assistance.
Best Regards,
Hans
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Oct 24, 2015
missing witness server information and the fail-over is broken suddenly? 4:00am no maintenance job. I have one sql job on 10pm for backup on database transaction log only.
I can see the primary have problem then perform fail-over to mirror database, the auto fail-over was broken.
I re-build the sql mirror is OK , but i want to find the root cause.
Windows application event was full when there have many failed event, i have increase log size for application event.
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Sep 14, 2006
I have managed to set up mirroring on SQl 2005 however i have a come across a problem that i dont know how to resolve.
Im running the mirroring with 'High Safety with automatic failover.'
If i instagate a failover on the Principal Database, the mirror becomes the Principal, and vice versa ... great .. how ever .. i tried the golden test by making the principal server dissapear by yanking out the network connection, expecting the mirror to become the principal.....nope it just stays there in a disconnected / restoring state which isnt any good to man nor beast . I thought that the Witness should have dectected that the principal database had 'dissapeared' and would have made the mirror the Principal.
Any pointers on where i might have gone wrong in the setting up process, i used the mirror wizard
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Jan 28, 2008
Can 1 witness server work for 4 Principal and mirror servers?
Needs expert advise.
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Jun 19, 2014
One of my client asking mirroring between two server with witness.Is it possible witness and mirror in same server(with same instance)? OR Is it possible witness and primary in same server(with same instance) ? Best method to establishing mirroring with in two servers(with witness) ?
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Jul 10, 2013
I need to start mirroring the databases without witness server.
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Sep 14, 2015
I am unable to add witness server to my mirror configuration. my error log is throwing error'Connection handshake failed. The certificate used by the peer is invalid due to the following reason: Certificate not found. State 89'.
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Apr 9, 2015
We have 2 data centers, site 1 and site 2. Site 1 is generally our primary, and site 2 is our Disaster Recovery (DR) site. I want to setup a SQL instance to have extremely high availability. Therefore I was looking at using DB mirroring, with synchronous data writing, high-safety and auto-failover. This requires the usage of a witness server.My problem with this setup, is that if the witness and principal are both at site 1, if site 1 goes away (power failure, asteroid impact, lol, anything else that would be a *true* DR scenario), then there is no failover to the mirror server at site 2. However, if you put the witness at site 2, anytime the WAN link between site 1 and site 2 has an issue, the DB will auto-failover to site 2. Is the reason for the recommendation of the witness being at the primary site because the thinking is that WAN link failure is likely more common than a *true* DR scenario that takes out all of site 1?
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Jun 14, 2015
I am using SQl Server 2012 Database Mirroring with around 40 gb as mdf and 1 gb as ldf. Now my ldf size increased . How to reduce ldf size while mirror enabled with mirror server and witness server. Can shrink the ldf with mirror enables.
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Jan 31, 2008
After adding the Witness Server to the Mirror session, the Witness Connection state between the Mirror and Witness Connection is Disconnected and the state between Principal and Witness Connection is Connected.
The procedures defined in Books Online was used to setup Database Mirroring...when the Witness server was added to the Mirror session, only the alter database T-SQL statement was executed on the Principal server.
ALTER DATABASE <db_name> SET WITNESS = 'TCP://<servername>:<port>'
After executing the above statement, a few seconds later the state between Principal and Witness Connection changed to Connected and the state between Mirror and Witness Connection remains Disconnected.
The Mirror session is not using Certificates, every server is on the same domain, using the same domain login account, and all servers have SP2 installed running Enterprise Edition.
Any idea's why the state between Mirror and Witness Connection remains Disconnected?
Thanks,
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Nov 7, 2006
Can I know is it possible using database mirroring for only certain tables from the database, not for the whole database in sql server 2005. Hopefully able to get any assistance here. Thx alot.
Best Regards,
Hans
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Oct 10, 2005
Hi, for SQL 2005 - to set up database mirroring, is it required to have Active Directory installed or to be part of a domain? I am looking to use a workgroup with the SQL machines only and to not reference any domain and cannot find this information - is this possible?
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Feb 1, 2007
Can I use Database mirroring between 2005 Std and 2005 Ent editions?
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Mar 8, 2007
Hello, My question is simply: according to BOL, a DB snapshot taken from a Mirror is read-only. Say I wanted a temporary (disposable) read-write DB created from the snapshot. Is there a way to generate a writable temp DB (that's not tempdb) from the snapshot? Thanks,AK
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Sep 27, 2006
Hi All,
I get a general question about the feacture "Database Mirroring". Is it support by SQL Server Standard. Edition without SP1?? Of i still need to upgrade the server from SQL Server 2005 to SQL Server 2005 with SP1?
Another question: are there any problem if the one machine(server) has installed SQL server 2005 Standard edition and the other with "Developer Editon".
I hope some one can answer my question. Thanks anyway!
Regards,
Pat
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Apr 7, 2008
Hi all,
i have a small problem to connect SQL Native ODBC Client to a mirrored Database.
The connection goes without any problem when I connect to a primary Database, but when i give this connect string to an
ODBC Client ""Server=Partner_A; Failover Partner=Partner_B; Database=XXX; Network=dbmssocn"", then i get an connect fail.
There are no firewalls and other things on the network.
I am also able to connect to a mirror database during failover, but I'm not able to set both servers on the ODBC Connection.
Kind Regards,
Gruna
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May 30, 2006
I am trying to enable database mirroring for 100 database.
It goes error free till 59 databases (some times 60 databases) with the
status (principal, synchronized) on principal. on the 60th or 61st database
it gave the status (principal, disconnected). Also mirror starts acting
abnormal. connection to mirror starts to give connection timeout and it is
not enabling database mirroring on any more databases. I have SQL SERVER
2005 Enterprise with SP1 on the servers. witness is not included yet.
this are my test servers... i have more than 500 databases on my production
servers.
principal and mirror both are using port 5022 for ENDPOINT communication.
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Jul 17, 2007
Dear All,
I have a download "SQL Server 2005 Evalution Copy". I installed it to 3 machine, 1 - XP Professional (Witness) and 2 - Windows Server 2000 (Principle and Mirror) . And I want to try Database mirroring.
However, after restore the Log into mirror server I try to execute the following statement in Principle Server:
ALTER DATABASE TestDB
SET PARTNER=N'TCP://[10.0.200.2]:5022'
GO
The above 10.0.200.2 is the mirror server IP address.
it show error message as:
Msg 1416, Level 16, State 31, Line 1
Database "SCMPGroup" is not configured for database mirroring.
In Miorror Server
I execute the statement :
ALTER DATABASE TestDB
SET PARTNER=N'TCP://[10.0.200.1]:5022'
The above 10.0.200.1 is the principle server IP address.
It shows sucess
ALTER DATABASE TestDB
SET WITNESS=N'TCP://[10.0.15.146]:5022'
it show error message as:
Msg 1416, Level 16, State 1, Line 1
Database "SCMPGroup" is not configured for database mirroring.
Please help me! I down't know if NT4 domain or evalution copy problem in there.
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Jun 1, 2006
I am trying to enable database mirroring for 100 database.
It goes error free till 59 databases (some times 60 databases) with the
status (principal, synchronized) on principal. on the 60th or 61st database
it gave the status (principal, disconnected). Also mirror starts acting
abnormal. connection to mirror starts to give connection timeout and it is
not enabling database mirroring on any more databases. I have SQL SERVER
2005 Enterprise with SP1 on the servers. witness is not included yet.
these are my test servers... i have more than 500 databases on my production
servers.
principal and mirror both are using port 5022 for ENDPOINT communication.
All of the databases are critical and all must be included in the Database Mirroring.
so, after that I tried to implement database mirroring again......
System has 3 GB of RAM, SQL SERVER (Mirror) using 85 MB of RAM but still
giving this error while trying to enable database mirroring for 37th
Database.....
"There is insufficient system Memory to run this query"
WHY?
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Sep 16, 2005
Can someone at Microsoft comment on this article, specifically, how it relates to SQL Replication? Will SQL Replication fall into the category of what this article describes, or only the mirroring feature?
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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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Jul 12, 2007
I am trying mirroring in my own laptop in 2 different instances of 2005 but when i configure it gives me an error "one or more of the server network addresses lacks a fully qualified domain name (FQDN). Specify the FQDN for each server, and click start mirroring again"
does anyone know what is the problem???? i read one post but could not understand properly.
Narayan
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Dec 28, 2006
i setup sql 2005 mirroring
when i run the wizard and start mirroing i get the folllowing error:1418
in the log it says database mirroring login attempted by user NT AUTHORITY/ANONYMOUS logon does not have connect permissions on the endpoint
my service acount is LOCAL SYSTEM
all 3 sql servers are in same workgroup
i can connect with studio to all 3 with no problem
any one have any clues here
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Jul 31, 2007
Hi everyone,
I have a project on my hand in which i need to implement two SQL 2005 servers
And configure it as DB mirroring.
I know that for the sake of 'fail over' I need to configure a witness
server as well.
My question is:
For the purpose of the mirror server and the principle server - what
are the software requirements (enterprise, standard?)
For the purpose of the witness server - what are the software
requirements (enterprise, standard, express?)
Should the witness server be a 'server' in terms of hardware...or is
it enough to establish a strong pc machine?
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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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Apr 25, 2007
Hi guys,
I have read many articles on the matter and I have probably used up all my printer's ink in doing so, however, some questions still remain.
1) What happens if I have to reboot the mirror.. security update, etc.? Obviously the session is broken during reboot, but would I have to do another backup of the principal and resync everything?
2) I know it is not best practice but at this point I have no choice, however, I wanted to get your guys feedback on having two instances of SQL2005 on my development box. One for the mirroring of the production and the second for development. The two instances would live on their own drive... not partitioned and have adequate memory and space.
What would I have to look forward with this?
3) Lastly, I am still uncertain if mirroring is approved for production. Is it?
Thanks for your help.
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Jul 20, 2007
I am working on a proof of concept to take to our Technical Board.
This POC is concearned with SQL server 2005 Mirroring for High Availability and Failover in a Highly Critical business sector.
The problem is that we use custom web pages to give the Operations Center an overview of the status of the system and that there are so many metrics available (not may are well documented). I have looked at the following
sys.database_mirroring_witnesses
is_suspended to show the state of the Sync
database_name to return the name of the mirrored database
safety_level_desc to show that the Safety level is at Full
Principal_server_name to show the name of the Principal server
Mirror_server_name to Show the Name of the Mirror Server.
I am at a loss as to what is the best approach as I do not want to display too much Information and confuse.
The Servers are locked down to remove any permissions not required so I have to create a SQL account with only acces to the required sys views. one issue is that the following SQL only works on the Principal
Code SnippetSelect * from sys.database_mirroring where mirroring_guid is not null
The Principal returns
Code Snippet
7 267CF8D3-8066-44EA-84BD-B7EA25C3F779 4 SYNCHRONIZED 2 MIRROR 20 2 FULL 1 TCP://DNGLHRSQL051.XX.XX.XXX:5022 DNGLHRSQL051 TCP://LHRSQL029.XX.XXX.XXX:5023 1 CONNECTED 40000000010300001 10 NULL UNLIMITED
where the Mirror will return nothing..
The configuration of the User is identical on both Principal and Mirror and is as follows
Master Public
MSDB Public, dbm_monitor
I have read that the User also requires "view any Database" but on the Mirror this database is not available on the Mirror as it is in Sync.
Is this an undocumented Feature?
Any help greatly appreciated
Regards
Andy
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Aug 16, 2006
I am trying to set up a SQL mirroring senario - I have some questions
Do I need to purchase an extra SQL Server license for the SQL server instance on the Mirror? what about the Witness does that also need a separate license/
Can the witness be a virtual server on the Mirror box itself? Do I still require a license if the witness is on a virtual server?
Thanks
jawahar
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