Recovery :: AlwaysOn Availability Groups Server Logins Fails When Switching Between Nodes
Jul 9, 2015
I am setting up a 3 node cluster as part of an availability group.Initially I tested failover between nodes using SQL Management Studio and everything failed over successfully when I stopped a node, and I was still able to write queries. I started to test with an application which connects using an SQL user and whenever I would switch nodes, I would get login failed. I believe the cause of this issue is because the server logins SID's which are tied to the database are different than the server logins on the other nodes which resulted in login failed.how can I ensure that the server logins SID's are the same between nodes? Is there a way of copying this over or how is this supposed to be done? I read a little about contained databases where I could just set the login on the database itself vs. creating a server login but I would rather not go down that route.
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Dec 1, 2015
I have configured replication between Always ON Availability Groups (Listener) (PUBLISHER), remote distributor to XYZ SUBSCRIBER...with above link ...
Now, I want to know how to replicate Data from XYZ SERVER a PUBLISHER to Always ON Availability Groups (Listener) (SUBSCRIBER)? Distributor Database being on XYZEX:
XYZ SQL SERVER as PUBLISHER, and DISTRIBUTOR
to
Always ON Availability Groups (Listener) SUBSCRIBER...
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Sep 16, 2015
Can we set up always on availability groups in server 2012 standard edition.
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Oct 19, 2015
I'm doing a certification process using AlwaysOn, and was using the link below, and on the lower 90 hotfix, and instead of downloading one by one, and then upgrade one by one updates, is there any way to make it more faster or practical, or unfortunately have to do this one by one, so the download as the update? This rollup contains the latest version of the Windows system files that are updated after the release of SP1. URL...
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Aug 17, 2015
We have a requirement to build SQL environment which will give us local high availability and disaster recovery to second site. We have two sites- Site A & Site B. We are planning to have two nodes at Site A and 2 nodes at Site B. All four nodes will be part of same Windows failover cluster. We will build two SQL Cluster, InstanceA will be clustered between the nodes at Site A Server and InstanceB will be clustered between the nodes at Site B, we will enable Always On Between the InstanceA and InstanceB and will be primary owner where data will be written on InstanceA and will be replicated to InstaceB. URL....Now we want we will have instanceC on the Site B and data will be writen from the application available on Site B, will be replicated to the instance on the Site A as replica.
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Apr 2, 2015
The MSDN doc makes it sound like after a failover of the primary, the CDC data won't "keep working" on the secondary unless you "To allow the logreader to proceed further and still have disaster recovery capacity, remove the original primary replica from the availability group using ALTER AVAILABITY GROUP <group_name> REMOVE REPLICA. Then add a new secondary replica to the availability group."
We have a few CDC tracked tables that we use and the general idea of AlwaysOn I thought was to minimize all the overhead and let things "just work" so your apps just connect and the listener re-routes everything where it needs to go.
It looks like to get this working properly an automated job /trigger would have to wait for a failover event and then kick off tasks to remove and re-add the replica and perhaps start up the CDC job on the secondary?
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Sep 15, 2015
I am planning to have AlwaysON Availability Groups setup between Server 1 and Server 2
Server 1 -->Publisher-->2014 SQL Enterprise edition-->Windows Std 2012 --> Always on Primary Replica
Server 2 -->Publisher(when DR happens)-->2014 SQL Enterprise edition-->Windows Std 2012 --> Secondary Primary
Server 4 as Subscriber
Server X as Remote Distributor ..
If i create Publications on Server1 (primary replica) to subscriber 4 servcer, will the publication be created automatically in Secondary Replica Server2 ? or do i have to create manullay using GUI/T Sql on Both Servers?
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Sep 14, 2015
I am planning to have AlwaysON Availability Groups setup between Server 1 and Server 2
Server 1 -->Publisher-->2014 SQL Enterprise edition-->Windows Std 2012 --> Always on Primary Replica
Server 2 -->Publisher(when DR happens)-->2014 SQL Enterprise edition-->Windows Std 2012 --> Secondary Primary
Server 4 as Subscriber
Server X as Remote Distributor ..
as of now , In the event of Disaster happens on Node 1 i will have to manage JOBS on Node 2 (backups, Maintenance, replication, day-day other Jobs)..Is there a way i can call all jobs to run from a remote server which executes on Active NODE(which ever is active)? so that in the event of disaster happens on node1, when node 2 becomes online and i don't have to do anything with SQL Agent or jobs on Node 2?
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Oct 16, 2014
This is my first deployment of an always on availability group for SQL 2014 and I'm trying to get my custom backup procedure to handle all databases appropriately depending on the primary group. Basiscally I want the system databases and all databases that don't participate in the availability group to be backed up on both nodes and those that do participate backed up ONLY on the primary server. I've looked at the sys.fn_hadr_backup_is_preferred_replica funcation, but would like to only have to test for a single databases existance in the availability group. If the one database is in the group, only backup the system databases and those that don't participate, otherwise backup everydatabase. This would be the case for both full backups and transaction logs.
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Feb 13, 2014
I have four instances and each instance have its own Availability Group with its own listener.
Would like to know if you can have one listener for multiple Availability groups?
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Apr 28, 2014
We had 3 Availability Groups set up in SQL 2012 last year but they were poorly named so I am just looking to rename them but there doesn't seem to be any command for it that I can find.Can they not be renamed once created? I guess I could just create new ones and move the DB's into them but just thought I would check!
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Sep 15, 2015
We have multiple SQL 2012 SQL servers setup in an alwaysOn availability groups. Where should we schedule the re-index? We have Server1 as the primary and 2 secondaries Server2 and Server3. Are their any tricks to have it run on which ever one is the primary?
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May 28, 2015
I have a 2012 AlwaysOn DB Mirroring environment set up with two nodes. Both have 5 installs of SQL named instances.
The issue we are having is when we patch one server and fail everything over, some of the applications will error. Some of the applications had to have their web.config files updated with hostinstance name because it seems to not work with DNS.
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Sep 9, 2015
I'm just starting to work with AlwaysOn Availability and WSFC.
I have in my environment (in Azure) a DC, WSFC and to SQL instances, so I have 3 nodes in my Failover Cluster:
WSFC
SQL1
SQL2
If I simulate failure by shutting down one of the SQL boxes my Availability group seamlessly fails over to the other SQL instance - which is great.
However, I'm starting to look into the workings of the Quorum, my envt has the default settings and when I shutdown both of my SQL servers I expected the Cluster itself to go offline as 2 out of the 3 votes will be negative, but the Cluster is still up - Screenshot below when SQL1 and SQL2 are shutdown:
Going through the Wizard (but not changing anything) it shows following config:
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Nov 13, 2015
We have an AAG environment. In order for the failover to be transparent we have to ensure that the login that is added in the Primary node is also added to the secondary node. Currently, we are adding the logins to the secondary node manually. Is there a way to automate this process so that a Login added to the Primary node is automatically updated on the Secondary Node.
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Aug 13, 2015
How do I add my second (secondary) node in my AlwaysOn Availability Group, after adding my head node, and the secondary node is a virtual machine. See based on the attached file if it is the correct way?
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Jul 3, 2015
How to test always on availablity after configuring them.I have configured always on group with 1 active and 1 passive with readonly.I want to test from application.what are cases which we can have for testing.
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Sep 18, 2015
We have a SQLServer 2012 Always-On Availability (AAG) Primary and Secondary Node installation/environments. On the Primary node, we have some databases that have the TRUSTWORTHY option enabled (Set to ON). But when the databases are synched/added to the AAG the databases loose the TRUSTWORTHY property and are reset to OFF on the Secondary Node.Because of this,When the instance fails over to the Secondary Node the applications that were working don’t work anymore.
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Sep 22, 2015
I have an active passive cluster on my primary Data center in NY and have a DR Active / passive SQL Cluster in TX. These are two separate clusters in the same domain using the same SQL server credentials.Both clusters host an active / passive SQL instance. Lets call it SQLNY(Primary) and SQLTX (DR). I want to enable always On Availability group within the two SQL Instances SQLNY and SQLTX. The listener will be SQLAG which will be used by the Application to connect to the SQL instance. Is there a practical way to implement this? This will not only give me instant fail over within the NY (Primary) but also give me the flexibility to fail over to TX. I am using SQL 2014 Enterprise Edition on both clusters.
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Jul 11, 2014
I have a situation where I have two servers in SQL Server 2012 R2 AlwaysOn Availability Group. One is primary and the other one being secondary. I am only running SharePoint Database on it.I have run out of space on the primary server and about to run out of space at the secondary server. I have tried shrinking database transaction log files, but it returns an error that it cannot be shrunk as the database is in the AlwaysOn Availability Group.
Questions:
1. Several forums suggest that databases need to taken out of AlwaysOn Availability Group in order for the shrinking to work properply?
2. Would it have any impact on the database if it is taken out of availability group and then added back?
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Apr 29, 2015
Is AlwaysOn Availability Group support SCCM , SCOM and DPM ??what is the best Solution for this products to be highly available ??
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Jun 22, 2015
We are trying to build HA and DR environment, combining AG and FCI. So we have 3 servers added to a cluster, 2 of them sharing the same storage and working as ACTIVE-PASSIVE cluster instance. The other server has a stand alone instance with its local storage, with the same drivers letters as the cluster instance.
Between the Active FCI and the Stand Alone, we set up an Availability Group. They are running fine, except by the listener. When the stand alone instance owns the Primary Replica, I am able to access the SQL Server instance by the listener, but when the Primary Replica is owned by the FCI, I can't reach the database by the listener (name or IP).
I've opened the same ports in both servers, it hasn't worked though.
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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 documentation
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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Jun 5, 2014
I have a two node SQL 2012 AlwaysOn HADR cluster (v11.0.3412) with 4 availability groups configured. The AG groups are set to synchronous mode and the secondary is not readable (we do not want the synchronous replica readable so we do not risk any reads causing contention so we maintain fast performance).
On the secondary we are getting a persistent failure with the Data Collector job called Collection_Set_3_Upload. The failure occurs within the second job step. That job step is executing the following command:
dcexec -u -s 3 -i "$(ESCAPE_DQUOTE(MACH))$(ESCAPE_DQUOTE(INST))"
The error message is as follows:
Log Job History (collection_set_3_upload) Step ID 2 Server CLUSTERNODE2
Job Name collection_set_3_upload
Step Name collection_set_3_upload_upload
Duration 00:00:07
[Code] ....
I know I can prevent this error message by enabling readable secondaries, but we do not want this.
I have tried stopping the data collection jobs and purging the cache directory but to no avail. It will succeed the first time then persistently fail again with the same message every time after that.
In addition, if I set the one failing AG group to readable secondary the job succeeds. So that means that 3/4 work fine, only this one is having an issue.
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Jul 16, 2015
I have 3 synchronous AlwaysON replicas: A, B and C. A is primary, B and C are secondary and both are set to Automatic recovery. How can I understand, which of them (B or C) will become primary when A goes offline? Well, Actually my final DB system should support following configuration:
1) Normally - A is primary B and C are sync secondary.
2) if A fails, B automatically becomes primary, C remains Sync secondary.
3) if A goes online, it becomes primary again
4) C becomes primary only after A and B fail (and there still should be cluster quorum!)
As I understood, first of all i should configure quorum the following way: A-0, B-1, C-1, folder-witness-1.
The problem, again, is: I cannot understand how to configure which replica becomes primary when AG fails over.
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Sep 24, 2015
I have Configured always on Availability groups between Server 1 Primary Replica(Active), server 2 Secondary Replica(Passive) on top of WCFS...
Listener Name: AGListner( CLIENTS/APPLICATIONS connect using this Name)
Testing Scenario 1(on Virtual Servers):
I have turned network down on Server 1(primary) , then secondary server (Passive ) one came ONLINE and this is now the primary and i was able to connect to AGListner.now When i try to SHUTDOWN/POWER OFF PRIMARY(current Active server),failover happened to Secondary successfully but lost cluster and lost AGListner and was not able to connect ....now applications which are trying to connect using AGListenr name will loose all connections..does AlwaysOn Availability does not support Server SHUTDOWN/POWER OFF?or is there a way to resolve this? or am i doing wrong somewhere?
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Nov 29, 2014
Secondary server is offline due to a hardware issue and the log files are growing on Primary sever for availability databases. The log drive is running out of space. How can I stop the log growth for the primary databases?
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Jun 17, 2015
What I asked for: Three Windows Server 2012 R2 machines with independent storage running a SQL Server 2014 AlwaysOn Availability Group. DB1 would be the primary, DB2 would be a synchronous replica, and DB3 would be a remote asynchronous replica.
What I was given: a two-node Windows Server 2012 R2 WSFC to run SQL Server 2014 Enterprise with shared storage and a third (remote) Windows Server 2012 R2 machine with independent storage, also with SQL Server 2014 Enterprise, to host an AlwaysOn Availability Groups asynchronous replica.
DB1 and DB2 (as Cluster1) share an E: drive. The remote DB3 has its own E: drive. Initially, DB3’s E: drive was claimed as a cluster resource and I couldn’t even see it. I’ve had several ugly days trying to make this work and have temporarily given up, installing DB3 as a standalone SQL Server that is no longer part of the WSFC and pointing everything towards that (it was originally a third node in the WSFC).
Is it possible to create an AlwaysOn Availability Group with nested clusters (i.e. create the AOAG with Cluster1 and DB3 and somehow ignore the individual nodes that comprise Cluster1)?
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Dec 1, 2014
We are currently using 2008 environment. We do have an SSIS Package running. The package used to run everyday and take the production server full backups and restore into the another server. Then do some delete commands and do some updates in that database on that server (We have some sensitive data other than Production we have to run that scripts in any environment). After run all those delete statements another team will read the data from that database.
We are planning to migrate to 2014 and set up always on and use the replica as the source. In this case how the package will work?
How to change that SSIS package. With the 2014 always on we are directly reading the data there is no backups to restore then how to run the delete statements?
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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 21, 2014
how does security works between availability groups.
ex if i create an object and grant permissions to a user will that be replicated to secondary replica .
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Aug 28, 2014
We are having a conversation at work and the subject of load balancing with SQL came up. Right now we are running SQL Server 2014 on four (4) machines. I am using a AlwaysOn with Availability Groups (AG). Now I know that we can scale out the reading in AG by allowing the secondary serves to receive reads.
Is there a way to be able to do this with writes? Can I have in essences 2 masters that some how reconcile with each other? We are expecting a huge amount of writes in the near future and we need a way for SQL to handle the amount of traffic we are expecting with out any issues.
I explored the possibility of Peer - to - Peer replication; however, it seems that it would be more work if we are constantly making updates to the database scheme.
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Feb 11, 2015
we currently use Backup Scripts from Ola Hallengren, It Says Full (non copy-only) and differential backups are performed on the primary replica. Full(Copy-only) backups and transaction log backups are performed on the preferred replica.
we currently do FULL(COPY_ONLY) Backup everyday and LOG Backups for every 15 min, is there any performance benefit on running the FULL (non copy-only) on the preferred replica .
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