High Availability To High Protection Without Reconfiguring Mirroring
Apr 23, 2007
Hi,
Is there a way to configure mirroring to go from High Availability to High Protection without having to reconfigure Database Mirroring? Using the interface in Management Studio, I can change the configuration option to High Performance, but not High Protection despite both of them being Synchronous.
If not, what are the recommended steps to configure the mirror once it already has been configured? Is just like initially setting up the mirror or would there be any shortcuts I could take? If I stop the mirroring and remove the witness, will the High Protection option be available?
Thanks,
J.
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Jan 11, 2008
Here is the situation we are trying to resolve. The client has 2 locations, each has local appliations running on a database. db schema on both locations are the same, data is different and won't overlap.
The requirements are:
1. at each location the application can read and write
2. near zero down time for applications on each site
3. db on one site also has the data from the other site for DR purpose
The client is running on SQL 2005 STD SP2
We looked at the approach of setting up db mirroring on each location + 2-way transactional replication between both locations. The mirroring was fine, and I was able to set up transactional replication from mirrored publisher to a non-mirrored subscriber. But, from what I experienced and from reading, there is no way to have the subscriber db to be mirrored, since Distribution Agents simply doesn't have the option to specify Failover Partnr for mirroring, so I guess it is not supported. Any comments on that?
Assuming that's correct, then the only way of using SQL out-of-box technique seems to be using Clustering on each location instead of mirroring, then the 2-way transactional replication works on clustered subscribers I think (although I haven't tested it). Peer-2-Peer replication would have been a good candidate between sites in this case, but STD version of sql 2005 ruled that out.
Any suggestions and comments are welcome.
Thanks
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Oct 30, 2006
Hello,
I would like implementing a database mirroring architecture with SQL server 2005 but i have questions.
If i don't use a cluster architecture, i would like knowing if there's any solution to move the alias SQL server from the primary to the secondary by script.
Anyone got a pb like me? or any solution?...
Thanks for your help...
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Oct 4, 2007
Hi
I am experiencing a problem while performing failover testing on 2005 Standard.
I have an application which uses an ODBC connection SQL Native Client with a failover partner.
The following is the series of events that cause the problem. I am using a domain admin account whilst testing which has a server login on both servers with the same privileges.
Server A (Principle)
Server B (Mirror)
**Application can connect**
Manual failover
Server A (Mirror)
Server B (Principle)
**Application can connect following a restart**
Server A is switched off
Server B (Principle, disconnected)
**Application continues working**
***restarting the application the following error occurs***
€śConnection Failed
SQLState 08001
SQL Server Error 53
[Microsoft][SQL Native Client]Named Pipes Provider: Could not open a connectionto SQL Server [53].
Connection failed:
SQLState: '08001'
SQL Server Error: 53
[Microsoft][SQL Native Client]An error has occured while establishing a connection to the server. When connecting to SQL Server 2005, this failure may be caused by the fact that under the default settings SQL Server does not allow remote connections.
Connection failed:
SQLState: 'S1T00'
SQL Server Error: 0
[Microsoft][SQL Native Client]Login timeout expired€ś
Any help with this would be most appreciated
Peter
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Mar 2, 2004
Hello everybody,
We are starting new project
Customer validation with minimum wait time.
How to insure High-Availability?
We have 2 standard servers and in past used custom log shipping.
Log shipping still requre manual intervention ,while goal to switch
between servers automaticly.
Clustering is a last possible solution.
Could someone recomend any other soluion or products?
Thank you
Alex
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Jan 19, 2003
Hi,
I am new in SQL SERVER.I wanted to setup high availability database.It would be great if any one could answers my questions please.
-What are the options availability for HA except clustering?
-How to set up log shipping HA ?
-How to monitor log shipping?
-Is standby DB and log shipping same ?
-Can I setup log shipping without backup/restore method.Like I have to create db1 on server A and create db1 on server B and then configure log shipping?
-Is it necessary to ship log for master database or only user Database?
Thx
-Blace
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Oct 27, 2013
I have to describe Microsoft SQL High Availability options in the following layers: infrastructure, middleware and application. I know there are following options available: failover clustering, replication, mirroring and AlwaysOn but I am not sure in which layer each of them are.
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May 17, 2004
I have implemented log shipping between 2 databases, the transaction log size normally between 10mb - 50mb every 15 minutes during normal working hours, but it grows to 9GB when we run database optimization job and that makes it hard and long to transfer and apply the transaction log on the other database. Does anybody encountered a situation like this and is there a way to minimize the size of the Trans log after the optimization job?
Thanx
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Jul 12, 2006
We have a multi-lingual website (English, Spanish and German). We have a table called Posts that is potentially getting really big.
We are in the initial design phase of the database and would like to know what the experts are suggesting to keep our database mean and lean in the long run.
We have been talking about splitting the database up into 3 separate databases, one for English, one for Spanish and one for German. The language specific databases would also be hosted in countries where the language is spoken eg. the German database would be hosted in Germany.
Or maybe database partitioning by language???
Making changes to 3 databases once launched seems like a nightmare. It would be nice to have one main database and maybe 2 (Spanish and German) €śsatellite€? databases or something like that €“ any ideas???.
Any suggestions of how to deal with this problem the best way would be greatly appreciated. We are using SQL Server 2005.
Newbie!
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May 18, 2004
Hello,
Does any one know, any software out there that can provide a solid failover / cluster / high availability solution for SQL Server 2000 Databases.
I have tried Incepto but it requires an extra column in every single table that involves in Replication and its not gonna work
So Please advise.
Thanks,
imransi.
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May 26, 2004
I've been asked to look into the possibility of using SQL Server in a high availability environment. We have a few web based applications that use SQL Server back end DBs. What we are looking into is whether we can use multiple instances (on multiple physical servers) of SQL Server using some type of clustering/load balancing. I haven't worked with SQL Replication before, so I'm not even sure where to start in exploring the possible avenues we can explore.
Can anyone push me in the right direction? Any info would be greatly appreciated!
Thanks,
Bill
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Mar 9, 2015
We have H/A setup on SQL2012. Seems to work fine.I thought there was code I could add that would check to see if it was running on the primary node?
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Apr 15, 2008
The company that I work for has multiple database instances across two data centres in two different cities. All of these databases have front end applications reading/writing data to them.
Now, we have taken an initiative to merge all databases into one consolidated database. Then we want this database to be available in the other data centre. We'll have front application running at both locations reading/writing data to the databases and want it to be written to the other database too. These systems are in production 24/7 and we cannot afford any downtime over 5 minutes.
Replication, Log shipping, Mirroring or combination?
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Aug 24, 2007
I need to make a brief presentation to upper management about High Availability options in SQL Server 2005.
Current choices being considered are:
- Failover clustering
- Log shipping
- Mirroring
Q1: Are there other choices?
Q2: How do these choices compare in terms of cost, complexity of setup, ease of deployment, recovery procedures in case of a disaster?
Ben Aminnia
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Apr 5, 2008
Hi
I would like to know, Is Logshipping is supported on SQL 2005 clustering?
Thanks in Advanceshan
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Mar 6, 2008
Hi There
I realise this is a stupid quesiton but i cannot really find any confirmation of this in BOL.
If you are running High Safety with automatic failover, when failover occurs does this automatically change to High Performance mode. SInce for failover to occur something has happen with the primary , it will be impossible to commit transactions on the new primary and mirror asyncronously since 1 of them is no longer available.
So am i correct in assuming that automatic failover also automatically changes the mode to High Performacne for that session?
Thanx
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Jul 23, 2014
So we have our HA group servers and databases, now we want to deploy schema changes to the HA group databases.
1.) Can we deploy the changes to Server2.mydatabase whilst still having Server1.mydatabase available to users?
2.) If yes, what is involved in doing so
3.) If no, What is the best suggestions to apply schema changes to HA databases.
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Nov 13, 2014
I am using SQL Server 2012 and my AlwaysOn High Availability features is not enabled? What should I do. Is this requires any extra system requirements to be installed?
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Feb 3, 2015
I have a Customer running a database in a High Availability Group and I am not familiar with the set up... They have a transaction log that quadrupled in size during a data import and update which was generated by an external application. They have limited server space and would like to shrink the log again now as this import / update only happens once a year. The way this has always been dealt with in the past was by shrinking the DB and logs after the update.
Now however, when attempting to do a log or db shrink, an error message is generated which says that the log cannot be shrunk as the DB is in use as part of an Availability Group....
The more I search and try to read up on this subject, it looks like the DB has to be removed from the Availability Group before the log can be shrunk and then the Availability Group has to be re-created or restored in some way. Is there a simple solution to this conundrum?
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Jun 9, 2015
I inherited a SQL 2012 Ent server sitting on a 2008R2 server using AlwaysOn High Availability, two nodes.
Available Mode: Synchronous commit
Failover Mode: Manual
Connection in Primary role: Allow all connections
Readable secondary: No
seesion timeout: 10
Somebody decided to give SQL server priority boost so I need to change this ASAP. So I plan on doing the following.
1. Manually fail over to the secondary, which does not have the priority boost set to true
2. change the setting
3. restart the service
4. Manually fail over
My question is with the service restart. How does SQL handle if the DB changes on the new primary while the secondary is having the service restarted. Where can I see if the DB are sync again or if not where are they in the sync process.
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Aug 18, 2015
I am trying to create a job that runs against my High Availability listener server.
It is a fairly simple SQL statement in the job - execute tsql.
When I try and run the job I get the error:
Executed as user: NT SERVICESQLAgent$SQL2014A. The target database ('BB_Prod') is in an availability group and is currently accessible for connections when the application intent is set to read only. For more information about application intent, see SQL Server Books Online. [SQLSTATE 42000] (Error 978). The step failed.
I thought there was a way to run a select statement as a job against the listener? The tsql step is only a select.
Is there a way to pass in the application intent = readonly as part of my SQL statement?
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May 19, 2015
Discovered that a geo-spatial AlwaysOn HA database (1 of 4) was not synchronizing as at a point in time earlier in the day. Â Suspend Data Movement appears to be working perpetually without finishing. Â The SQL Server services is in a Pending Changes state after an attempt to restart it from SQL Configuration Manager. Â The Cluster Dashboard says it is in a Not Synchronizing state, with only the one database in question having a yellow triangle, all 3 others show green. Â
The warning for the cluster is:At least one availability database on this availability replica has an unhealthy data synchronization state. If this is an asynchronous-commit availability replica, all availability databases should be in the SYNCHRONIZING state. If this is a synchronous-commit availability replica, all availability databases should be in the SYNCHRONIZED state. Â There is no abnormal data movement from the primary to the seconday.The warnings for the unhealthy database are:
The data synchronization state of this availability database is unhealthy. On an asynchronous-commit availability replica, every availability database should be in the SYNCHRONIZING state. On a synchronous-commit replica, every availability database should be in the SYNCHRONIZED state.Either a database administrator or the system has suspended data synchronization on this availability database.So how to get this database back to synchronizing state?
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May 19, 2015
Backing up all databases on a sql server that hosts secondary high availability databases as well as other databases. Â The other databases back up fine, but the high availability secondaries all get the same error:
BackupDiskFile::OpenMedia: Backup device 'F:MSSQLBackupdbnamedbname_backup_2015_MM_DD_tttttt_ttttttt.bak' failed to open. Operating system error 2(The system cannot find the file specified.)
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Jun 12, 2007
I am in the process of designing a database infrasture layout that can virtually scale to an very large number of servers in efforts to improve performance. The Scale-out architecture vs. grid computing (something like Oracle RAC) seems to be the way to go. It may take a lot more work up front, but it seems very flexible in the long run.
One of the issues that I am trying to tackle is how should I grow this thing. Right now, I have one single 4 way server running SQL 2005 Ent. edt. We are planning on getting a second server as well as a Enterprise level San solution.
With my 2 goals in mind (Scale out architecture and High Avail) should I bring this second server online as a passive cluster node, or should I partition out the data across both nodes. Will clustering even be part of my fault tolerence plan or should I use replication?
Its hard to find a good answer as what is the *best* way to make this happen.
Any insight will be greatful...
Thanks!
Eric Elliston
http://www.rbdstudios.com
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Apr 28, 2014
I came across an issue while migrating from SQL 2005 to SQL 2012 and using AlwaysOn Group. For some strange reason, when ever i connect to the Listener name for each AlwaysOn group, it list all the databases which is on the SQL instance, so i would be able to see databases that is not part of that Availability Group. I am not using default port, so have to put the port after the Name to connect and both Instance and Listener are using different port.
Testing the fail over works fine too, when i perform a manual failover, i can connect to any of the databases in the group from my application with no problem.
Considering that the Listener Port is different to the port which the instance is using?
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Jul 9, 2014
We have a vendor that is exposing our database via a High Availability replica. They are geographically far away from us though so we would like to extract portions of the database over to our side for our reporting /warehousing purposes. I was curious if it is possible to setup snapshot replication on a high availability group?
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Dec 16, 2014
I have a HA Listener which is visible and can be connected to, it has a read only secondary on a different subnet so when connecting to it we use the applicationintent = readonly and multisubnetfailover = true.
Trying to connect it as a linked server is giving me problems. I tried putting the extra info into the provider string but keep getting the failure to initialise error. I am trying to link SQL2012 to a 2012 HA group but will also need to connect from a sql2008 server as well
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Jul 9, 2015
I have a situation where I need to rebuild indexes on a large DB (500G).
When I do a test run of the rebuilds in my test environment it uses 100G of space - which is fine with me.
When I do a rebuild in my High Availability environment - same DB, same script - it eats up over 600G of space and fills the volume.
What can I do without removing my DB from H/A to rebuild the indexes?
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Nov 3, 2015
We are looking at going down the High Availability Always On route. However we have some concerns around the lack of support for MSDTC. In short we are concerned that developers may introduce functionality either on purpose or by mistake that uses the or escalates the Query’s to the MSTDTC. As this could result in database splitting.
Understand that this will be a moot point in SQL 2016 but for 20122014 is it possible to disable the MSDTC to protect against this and run High Availability Always On. ? Does it just need to be disabled on the SQL Server or does it need to be done on the application server ?
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May 27, 2015
I have getting issues when i am creating listener for always On . Error shown as below
Can not bring the Windows server fail over cluster (WSFC) resources online. (Error Code 5942). The WSFC service may not be running or may not be accessible in its currents states, or the WSFC resources may not be in a state that could accept the request.
For information about this error code see "system error code" in windows development documentationÂ
The attempt to create network name and IP address for the listener is failed. The WSFC service may not be running or may not be accessible in its currents states or the value provide for the network name and IP address may be incorrect. Check the state of the WSFC cluster and validate network name and IP address with network administrator. (Microsoft SQL Server error 41066) ...
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May 2, 2008
Hi,
can I assign a NAS(Network Attached Storage) server to store the database file(readable and writable) and assign other several MS SQL database servers which will use the same database file in NAS to achieve the objective of high availability?
If it can, how can I set it up in MS SQL Server or it requires another 3rd patry software to set it up?
Thanks.
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Oct 1, 2006
Hello!
I'm reading about database mirroring in High Safety Mode (Synchronous with no witness). I'm a little confused about what happens if the mirror server disappears.
From Books Online
"If the mirror server instance goes down, the principal server instance is unaffected and runs exposed (that is without mirroring the data)."
http://msdn2.microsoft.com/en-us/library/ms179344.aspx
I was to the course [Upgrading your Database Administration Skills to SQL Server 2005] and the course material does not say the same."Scenario: Synchronous mirroring without a witness server. If the mirror server becomes unavailable, the principal server will take the database offline. This action attempts to maximize the protection of the database and ensure the integrity of its contents"
I've made tests that shows that Books Online is right,
but I would like to know if this is a behaviour that has changed.
I also would like to know if it's possible to run in a more secure mode,
where exposed operations is not allowed.
Best regards
Ola Hallengren
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Oct 27, 2015
I 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.
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