Mirroring The Databases Without Witness Server?
Jul 10, 2013I need to start mirroring the databases without witness server.
View 3 Replies
ADVERTISEMENT
Database Mirroring | Can Witness Live On Mirroring Server?
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?
Witness Server In DB Mirroring
Jan 28, 2008Can 1 witness server work for 4 Principal and mirror servers?
Needs expert advise.
Mirroring :: Unable To Add Witness Server
Sep 14, 2015I 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'.
View 5 Replies View RelatedMirroring :: 2012 Database Mirror Missing Witness Server Information?
Oct 24, 2015missing 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. Â
Recovery :: Where To Place Witness Server For Mirroring Using High-safety And Auto-failover
Apr 9, 2015We have 2 data centers, site 1 and site 2. Â Site 1 is generally our primary, and site 2 is our Disaster Recovery (DR) site. Â I want to setup a SQL instance to have extremely high availability. Â Therefore I was looking at using DB mirroring, with synchronous data writing, high-safety and auto-failover. Â 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. Â 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. Â 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?
View 3 Replies View RelatedSQL Mirroring Witness
Sep 14, 2006I 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
SQL 2012 :: Mirroring In Two Servers With Witness?
Jun 19, 2014One 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) ?
View 4 Replies View Related2005 Database Mirroring && Witness
Mar 14, 2006I'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 beused in a production environment, yet the SQL2005 seminars I've been toindicate that this is a worthy option.Do we also need a witness server, or can this be done (sensibly) withtwo 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 ofthe SAN and Cluster and use the mirroring instead.Any advice on the pro's / cons would be appreciated.ThanksRyan
View 5 Replies View RelatedMirroring :: How To Reduce LDF Size While Mirror Enabled With Mirror And Witness Server
Jun 14, 2015I 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.
View 4 Replies View RelatedProblems On Database Mirroring (Loss Of Mirror And Witness)
Nov 29, 2006Hi 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
Mirror And Witness Connection In A Disconnected State Immediately After Adding Witness Server To Mirror Session.
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,
My Structure Contains Mutli Databases In One Server, Will That Affect Mirroring ?
Mar 19, 2008
With the Synonym, I was encouraged to separate my db to several smaller dbs, like base,dynamic,static and security. Now I am trying to use mirroring, I see it may cause problem, I think I need mirror all them to another server. My question is when the server is down, will all db switch to mirror server in the same time? And one can manually set which db is the principal db, but in my case, it will not work if principal server of all four dbs are not the same.
Any thought?
thanks
SQL SERVER 2005 Database Mirroring For Large Number Of Databases
May 30, 2006I 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.
SQL SERVER 2005 DATABASE MIRRORING For Large Number Of Databases
Jun 1, 2006I 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?
SQL Server Admin 2014 :: Database Mirroring For Large Number Of Databases
Oct 27, 2015I have a 2 node cluster having 4 cores each wherein having 3 instances of SQL 2008 R2 enterprise comprising of 60 databases, 20 on each instance. I need to setup mirroring for each of the databases to a secondary server having 4 cores and 3 instances. What i understand is that in this case the mirror server will be providing max of 512 worker threads and the 60 mirror databases would consume 240 threads.what all needs to be checked for looking into the feasabilty of going ahead with a async mirror setup as mentioned above.
View 0 Replies View RelatedMirroring Devices And Databases???
Oct 21, 1998Hi all
I have a raid 5 NT server 4.0 with SQL 6.5 running.
I perform backups on tranlogs every hour and db`s every night.
I also have another 16G Nt server not raid 5.
Can someone tell me if it is possible to mirror a device or a database
into the regular 16G NT server from raid 5 server?
HOW???
HOw about database mirroring??
And also whats the best solution when it comes to mirrorring in NT server?
Mirroring Large Amounts Of Databases
Mar 6, 2008I have been looking into mirroring a large amount of small databases approx 150 databases.
As I understand this won't be feasible because of the way mirroring threading works, http://forums.microsoft.com/MSDN/ShowPost.aspx?PostID=441900&SiteID=1
As I understand it for every database being mirrored sql will ping the mirror second, causing a network bottleneck?.
Also that the amount of threads generated for each mirrored database will cause also cause a bottleneck?
At the moment our database servers are under very little pressure and as an estimate use about 10% of the resources allocated to them such as CPU utilization, memory, disk IO and network. Our server hardware is Dual Quad core Xeons with 4 - 8 gig of memory and variety of 10k SCSCI raid configurations from raid 5 or 1,0 and sql 2005 32bit.
Ive done some calculations on the log file generation rate compared to network bandwidth there is more than enough network bandwidth.
Has anybody had any luck in mirroring many small databases?
My concerns is how much traffic is caused by the pinging of the mirror for each database?,
How many threads will the mirroring cause and what is the max amount of threads sql can handle?
How much memory will be consumed by each one of these mirroring threads?
Mirroring Databases Connected Through A View
Oct 12, 2006I have two databases db_A_primary and db_B_primary, both databases are on one Primary server.
db_B_primary has a View into db_A_primary.
Scenario: db_A_primary goes down and failsover to db_A_mirror on the Mirror server.
In this scenario when the View in db_B_primary is accessed will it automatically be redirected to look at the db_A_mirror database on the Mirror server?
Barry.
Mirroring Multiple Databases On A Single Instance
Jul 7, 2007Can someone explain what does this mean? This is from http://www.microsoft.com/technet/prodtechnol/sql/2005/dbmirror.mspx
<quote>However, all these techniques for coordinating client redirection with a database mirroring have an important limitation. Database mirroring occurs only at the database level, not the server level. Be careful if your application relies on querying several databases on a server, or uses multi-part object names to query across several databases. When several databases reside on one server, and they are mirrored to a standby server, it is possible that one of several databases might fail over to the standby but the others remain on the original server. In that case, you might need one connection per database that you are querying, so that you do not attempt cross-database queries on a standby server where only one database is a principal and the remaining are mirrors.</quote>
Also I read somewhere that if one mirrored DB fails, all other mirrored DB should also be transferred to the mirror.
For example: Let's say Srv1 (principle) and Srv2 (mirror) and Srv3(witness) are SQL servers with only default instances. The SQL instance has 4 DBs (DB1, DB2, DB3, DB4) and all of them are mirrored to Srv2.
An ASP.NET application has four seperate connection strings like:
objConn1 --> Data Source=Srv1;Failover Partner=Srv2;Initial Catalog=DB1;Integrated Security=True;
objConn1.connect();
objConn2 --> Data Source=Srv1;Failover Partner=Srv2;Initial Catalog=DB2;Integrated Security=True;
objConn2.connect();
objConn3 --> Data Source=Srv1;Failover Partner=Srv2;Initial Catalog=DB3;Integrated Security=True;
objConn3.connect();
objConn4 --> Data Source=Srv1;Failover Partner=Srv2;Initial Catalog=DB4;Integrated Security=True;
objConn4.connect();
If DB2 failsover to Srv2 (mirror), why should all other DBs be failedover?
Thanks
SQL 2012 :: Mirroring Multiple Databases On Single Instance?
Jun 10, 2014I have to mirror 3 DBs on my sql server instance . I have restored there full backups and log backups on mirror.I have also created endpoints on principal and mirror using default ports 5022 and 5023.
know if i can use the same endpoint for the databases on principal instance ?
Mirroring :: Async Mirror Setup For High Number Of Databases
Oct 27, 2015I have a 2 node cluster having 4 cores each wherein having 3 instances of SQL 2008 R2 enterprise comprising of 60 databases, 20 on each instance. I need to setup mirroring for each of the databases to a secondary server having 4 cores and 3 instances.
What i understand is that in this case the mirror server will be providing max of 512 worker threads and the 60 mirror databases would consume 240 threads.
What all needs to be checked for looking into the feasibility of going ahead with a async mirror setup as mentioned above.
Witness Only Seen By One Server
Mar 3, 2008The problem: One server sees the witness, one does not. If the dbs are active on the one that doesn't see the witness and I shut that server down everything works as it should. However, if the dbs are active on the server that sees the witness and I shut that one down the mirror does not take over because it can't see the witness and form a quorum. It throws Event ID 1438 every 20 seconds complaing "The server instance Witness rejected configure request...The reason 1451, and state3, can be used for diagnotics by Microsoft...."
The scenario: I finished setting up a mirror in a WORKGROUP, by going through the GUI and then at the choosing not to start the mirror. That allowed me to modify the NETBIOS names and change them to IP addresses in order to get around the FQDN requirement that I can't fulfill since the servers are in a workgroup. They are in the same subnet and can run SQL queries against each other.
When I query sys.database_mirroring from the database servers I get this on the good server:
mirroring_witness_name mirroring_witness_state_desc
----------------------------------------------------------
TCP://155.17.92.63:5022 CONNECTED
TCP://155.17.92.63:5022 CONNECTED
And this on the bad server:
mirroring_witness_name mirroring_witness_state_desc
-----------------------------------------------------
TCP://155.17.92.63:5022 DISCONNECTED
TCP://155.17.92.63:5022 DISCONNECTED
here's are the results from sys.database_mirroring_witnesses
database_name principal_server_name mirror_server_name safety_level safety_level_desc
-------------- -------------------------- ------------------------- ------------ ------------------
dbadmin TCP://pscdaltpscom20:5022 TCP://155.17.92.65:5022 2 FULL
dbtest TCP://pscdaltpscom20:5022 TCP://155.17.92.65:5022 2 FULL
Oddly, the server that I created the mirror from registered itself with it's NETBIOS name even though I told it to use an IP address. However, that's the one that is working properly. I think this might be a red herring.
Does anyone have any ideas why my second server can't communicate with the mirror? Any clarifications I can make? I have been completely unable to find a step-by-step guide to creating mirror databases outside of a domain...so if someone knows of one please point me that direction.
Neither The Partner Nor The Witness Server Instance For Data...
Jan 27, 2006I am getting this error while trying to setup mirroring.
"Neither the partner nor the witness server instance for database "shop" is available. Reissue the command when at least one of the instances becomes available. (Microsoft SQL Server, Error: 1431)"
I am just using principal and mirror server, there is no witness server. I have tried fully qualified name and ip for the servers also. I can connect from the principal server to the mirror server using the management studio and it also creates endpoints on prinicipal and witness. But then gives me an error that it cannot find the instance of the mirror server and if I try again it gives the error above. I can also telnet to port 5022.
I have used -T1400 as the startup parameter.
I did the backup and recovery based on this link http://msdn2.microsoft.com/en-us/library/ms189053.aspx and the mirror server is in recovery mode now.
64bit Mirrored SQL Server Std With 32bit Witness?
Mar 30, 2007
I have two 64bit SQL Server Std servers that will be principal and mirror. I also need to stand up a witness. I already understand that the witness can be any version of SQL Server, but can the witness server be 32bit given the principal and mirror are 64bit?
Witness Server Connection To Mirror Disabled?
Jun 28, 2007Hello,
the Mirror Server is not connected to the Witness Server.
Mirror Server and Wtiness Server are instances on one server.
I get this error:
"
2007-06-28 17:08:12.77 spid23s The server instance Witness rejected configure request; read its error log file for more information. The reason 1451, and state 3, can be of use for diagnostics by Microsoft. This is a transient error hence retrying the request is likely to succeed. Correct the cause if any and retry."
In the SQL Profiler for the Witness Server I get "An error occurred while receiving data" Error 64.
In the witness server logs is nothing depending on this.
The connection between the witness and principal and the mirror and principal are all right. I have created User logins with certificates on the same way on all instances.
What can I do?
Greets
Newly Created Witness Server Only Connects To One Of The Partners?
Apr 2, 2007We've been running a mirrored database (using certificates since we don't have a domain) and it's all working well. Last week we decided to add a witness for automatic failovers, but for some reason I just can not get the witness to connect to the Partner2 server.
See screenshot here
Please help me troubleshoot this - I re-created the endpoints / users / certificates but it's still not working. Where can I get more information on what exactly the problem is? Can I test the endpoints somehow?
Can There Be More Than One Witness?
Mar 7, 2007Say that ny witness goes down can I have another witness that takes it place
View 1 Replies View RelatedWitness Hosting
Sep 14, 2006Does anyone know where I can get SQL Server 2005 witness hosting? Our primary server is in Vermont and our DR site is in New Hampshire. I would like to set up a witness server somewhere off the east coast. I don't want to have to purchase a new server and pay big prices for colo.
Is there such a thing as witness hosting? Would someone be willing to host my witness and I can host yours?
Witness Not Working
Oct 24, 2006We are trying to set up database mirroring. The mirroring works for the principal and mirrored databases (set up via Management Studio), but when we try to set up the witness database, we are getting the error message €œThe ALTER DATABASE command could not be sent to the remote server instance 'TCP://€¦ (Error: 1456)€?.
The same occurs if I try to do €œALTER DATABASE xxx SET WITNESS =€? in TSQL. We are using the Standard edition for all three. We have tried using several different servers for the witness. All same user, same domain. Any suggestions?
Thanks.
Using SQL Express As Witness
Oct 28, 2006I have set up a SQL Express sytem to act as a witness....all are under the same admin account, all can ping and see each other. When I attempt to start a mirror session, it fails to issue an "ALTER Database" comment and the mirror setup is set to "High Performance".
This is my first time setting this up and it took over a day to do this as it is a relatively new concept, I am not DBA, just a S/W developer set up with the task of communicating with two DB instances which are mirrored. A couple of questions:
1) Is it normal to see the mirror instance in the following mode: (Mirror, Synchronized/Restoring)?
2) Any special steps required on SQL express besides enabling TCP/IP within the Configuration manager? It doesn't need the same instance of the same databaes on it, does it?
Paul
Changing IP Of Witness
Sep 10, 2007Hi,
I have a basic configuration question.
I removed mirroring on a configuration that is currrently working. Next, I moved the witness server to another IP and changed the FQDN (I patched the machine to another newtork, added a FQDN to our DNS server and reconfigured the machines IP information. I can ping the witness at its new address from the principal and the mirror).
Would changing the Witness's IP and FQDN prevent Database Mirroring from being setup after the certificate has been created and distributed to the principal and mirror instances under the old IP and FQDN? Should the endpoint be reconfigured and a new certificate be generated and distributed after an IP and FQDN change?
Thanks,
Chris
Witness In WM Ware
Oct 11, 20061) Is it possible to place the witness in an instance of VM Ware?
2) Are there any specific claims on the witness server if this uses SQL Server Express 2005?
Thanks in advance!
Dan