Availability Groups are a new feature of SQL Server 2012 that provide continuous data synchronization, automatic failover and secondary read access for one or many SQL Server databases.

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Clustering vs. transactional replication vs. availability groups

Assuming you need to make sure your application that relies on SQL Server 2012 as its database backend is available around the clock, even if one server machine fails. As a developer and not a DBA, I ...
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3answers
7k views

SQL Server Agent Jobs and Availability Groups

I'm looking for best practice in dealing with scheduled SQL Server Agent jobs in SQL Server 2012 availability groups. Maybe I missed something, however at the current state I feel that SQL Server ...
10
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1answer
3k views

AlwaysOn AG, DTC with failover

Problem: How can I run Distributed Transaction Coordinator (DTC) on all servers in an AlwaysOn Availability Group (AG)? I do NOT need to maintain transactions over failover/switchover events. Setup: ...
8
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1answer
2k views

Can Availability Groups provide seamless failover (with no query failures)?

I have been testing the Availability Groups feature in SQL Server 2012 and am finding that there is approximately 15 seconds of down time when the primary server fails over to the secondary server. ...
7
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2answers
850 views

Can Availability Groups replace transactional replication?

I've been looking at the new features of SQL Server 2012, and how it can help my current situation. Currently we're on SQL Server 2008 R2, and replicate two OLTP servers' databases to a single ...
7
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2answers
1k views

SQL Server 2012 Availability Group is it “AlwaysON”?

In a traditional SQL Server cluster when failover occurs, all clients that are connected to the SQL Server failed instance lose connections and each client must re-establish a new connection to ...
7
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2answers
3k views

How do Availability Groups work with cheduled jobs and SSIS packages?

I have 2 SQL Servers set up with a database in an AlwaysOn Availability Group. I also have jobs set up which run against the database. During a failover how do I ensure the jobs will continue to run ...
7
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3answers
324 views

AlwaysOn Availability Groups log_send_rate

On all our AlwaysOn setups, running Windows 2012 and SQL Server 2012 in virtual machines and on bare-metal, I find that the log_send_rate in sys.dm_hadr_database_replica_states is consistently ...
7
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1answer
286 views

SSMS Registered Servers with ReadOnly Application Intent

We are working on SQL Server 2014 POC testing with AlwaysOn and one of the user asked about saving the configuration of SSMS with ReadOnly Intent using the registered servers in Local server group. ...
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3answers
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Logins aren't syncing across Availability Groups

We have 2 servers in an AlwaysOn group. While the user accounts within each synchronized database exist on both servers, the database instance level logins only exist on one of the servers. Ie ...
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2answers
3k views

How do I change SQL Server 2012 Availability Group DNS subdomain?

Questions: how can I get my availability group to be registered as ag-ewgtest.sql.company.com given that my server thinks of itself as server.company.com. Setup: my SQL Server 2012 availability ...
6
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1answer
158 views

Is there a way to implement a cross-database task on SQL Server 2012 with the Availability Groups feature?

We use SQL Server 2012 and its new Availability Groups (AG) feature. There is a task for moving old data of some tables from one database to another database. Both databases are included into ...
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5answers
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SQL Server 2012 AlwaysOn: need to automatically add databases by script- T-sql or PowerShell

I've installed and successfully configured our SQL Server 2012 AlwaysOn 2-node servers for our new "Intranet" that is coming out. I've gotten AlwaysOn working great, and our Front End servers for the ...
5
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1answer
1k views

Specifying the failover partner when using Availability Groups

We have a situation where we are using replicated databases in an environment that's making use of Availability Groups. As we wanted no manual intervention when failing over, we decided to set up ...
5
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1answer
906 views

Recovery time effects of Availability Groups

We did different kinds of basic Tests and AlwaysOn passed in many tests. We finally did a heavy write test for AlwaysOn and it gave surprising results. The actual Test details are here, the goal is ...
5
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1answer
398 views

SQL availability groups log maintenance

I have a AG with 2 nodes in a site in sync mode and 1 offsite in async mode. I'm having trouble understanding how the logspace is maintained in this scenario. For instance, I'm taking log backups ...
5
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3answers
4k views

SQL Server 2012 always-on backup, full vs copy-only

I need a quick clarification on copy-only backup vs full backup as it pertains to transaction log numbering and restore if required. I have SQL Server 2012 setup with always on for multiple ...
5
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1answer
1k views

Service Broker & AlwaysOn Availability Groups: Odd Transmission Queue Behavior

I have also posted this question on my blog: http://www.sqldiablo.com/2012/04/15/service-broker-alwayson-availability-groups-odd-transmission-queue-behavior/. I’ve been working on a project over the ...
5
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1answer
2k views

SQL Server AlwaysOn Error_number 35206

I've joined a Ecommerce business where they use SQL Server 2012 AlwaysOn for HADR and this is the first time I've come across supporting this technology. The Sql Server log on both nodes gets ...
5
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1answer
697 views

Cross Database transactions with Availability Groups

Recently we are working on a POC to get Always on work and happened to see this article in BOL http://technet.microsoft.com/en-us/library/ms366279.aspx This article suggests that there would be ...
5
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1answer
3k views

Trouble Creating AG Listener: The WSFC Cluster could not bring the Network Name resource

We are trying to create an AG Listener and it errors out on us: It does however seem to create both the DNS entries and the virtual computer object in AD. However, because of this error message SQL ...
4
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1answer
134 views

AlwaysOn AG - CPU limitations

I’ve been trying to find out if the same CPU limitations database mirroring has apply to Availability Groups. My guess is that the same limitations exists, given that Availability Groups was built on ...
4
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1answer
428 views

Oldest unsent transaction alert for Availability Group

In SQL Server 2008 when using database mirroring, it was possible to set up alerts when the oldest unsent transaction exceeded a certain threshold. We could check the state of any database mirroring ...
4
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1answer
1k views

Transaction Log Truncation with Copy Only

I have a database backup job set to use full backup with the Copy only option on once daily. The copy only is on because from what I have read that is the only way to backup a database that is ...
4
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2answers
98 views

AlwaysOn Availability Groups back up schedules

We have AlwaysOn Availability Groups primary and secondary replicas where the secondary replica is preferred for back up jobs to take place as long as it is available. I created back up jobs on both ...
4
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1answer
1k views

AlwaysOn Availability Group Forced Failover

May I request your input. I setup SQL 2012 with always on availability group for my databases in sync and secondary readable mode. I completed failover tests with sync mode and it is functioning as ...
4
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1answer
190 views

Preferred node for read on Availability Group in a multisite configuration

We are going to set up a multi (at least 2) site configuration, and we want to achieve both HA as well as a good resource usage. The sites will be interconnected through a high speed, dedicated ...
4
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2answers
885 views

Can CDC or Change Tracking be against a read only secondary?

We will be deploying SQL Server 2012 Availability Groups with read only secondaries and would like to execute our SSIS extracts against the secondary while utilizing CDC or change tracking (the ...
4
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1answer
70 views

Why are these two HADR DMVs reporting different states?

SQL Server 2012 (11.0.5058.0) Enterprise Edition We have 8 Availability Groups in a 2(HA)+1(DR) cluster and our monitoring DMVs are reporting results that confuse me. 6 Availability Groups are ...
4
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1answer
3k views

AlwaysOn Availability Group Automatic Failover does not work

Playing with AG setup I have the WSFC up and configured with two nodes in one availability group called DevClusterOnline. Both nodes (DEV-AWEB5 primary, DEV-AWEB6 secondary) are running Windows Server ...
4
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1answer
927 views

Enable TDE for existing AlwaysOn databases

I need to do a little benchmarking of AlwaysOn, both with and without TDE enabled. All the instructions I see cover adding encrypted databases to an availability group, but I see no mention of ...
4
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1answer
3k views

How to link users and logins in an Availability Group?

I've got an Availability Group going and need to map some logins to database users on an active secondary replica. (Node2) Unfortunately, when I try to exec sp_change_users_login or alter user with ...
4
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1answer
246 views

AlwaysON : Log_Send_Queue_Size is increasing but the log_send_rate keeps decreasing?

Question Why, despite the increasingly log_send_queue_size for these two databases, did the log_send_rate keep decreasing? There were no bandwidth issues on the network at this time, and no other ...
4
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1answer
759 views

Are there problems with using SQL Server AlwaysOn Availability Groups with Windows 2008R2?

[Cross post from StackOverflow] Brent Ozar published this webcast (slides, video with free registration) entitled "Real-Life SQL Server 2012: AlwaysOn Lessons Learned", in which he repeatedly states, ...
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0answers
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Migrating VLDB to AlwaysON AG

I have been using AlwaysON AG for a long time now and currently have about 10TB of data across 120 databases and 3 AG groups for any application that is on SQL 2012 with great success. Each AG group ...
3
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1answer
101 views

Service Credentials to use in AlwaysOn Availability Groups?

When using AlwaysOn Availability Groups does each SQL Instance need to use the same service credentials? We are setting up a new SQL2014 deployment and will be using AlwaysOn. If I have 2 SQL servers ...
3
votes
1answer
5k views

Transaction Log Maintanance While Using AlwaysOn Availability Group

We are using HADR ( AlwaysOn Availability Group) feature of SQL Server 2012. Server and AG Configuration as below: SQL12_SRV1 --> AG1(PRIMARY) - SYNC -->> DBTest SQL12_SRV2 --> AG1(SECONDARY) ...
3
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1answer
63 views

Why is SAN Replication is Causing Random Database Corruption?

Having a strange issue with a disaster recovery technology we're trying to implement. The environment in both datacenters is the same having VMWare and Dell Equallogic SANs, which are the same ...
3
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2answers
366 views

What happens in this strange SQL Server Mirroring situation?

Let's assume that two SQL Server instances (S1 and S2) are in synchronous mirroring or in a synchronous Availability Group. Now the following happens: A write happens on S1 and transaction commit is ...
3
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1answer
983 views

Availability mode - manual failover mode, best practice for availability mode?

We don't want automatic failover for our availability group, but I have set availability mode to Synchronous, was that a mistake? The availability group runs on vmware with windows 2012R2, and I got ...
3
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1answer
80 views

AlwaysOn Secondary Replica DB-size

I just noticed something peculiar. We're using AlwaysOn availability in one of our environments with a read-only secondary replica. However, checking the .mdf / .ldf files for the secondary replica, ...
3
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1answer
1k views

Execute T-SQL Only If AlwaysOn Database Is Primary

Little background on the system. It is SQL Server 2012 AlwaysOn Availability Group with 1 primary and 1 secondary. I have been following this article (SSIS with AlwaysOn) to make SSIS work with ...
3
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1answer
3k views

Enabling Service Broker on a database involved in an availability group

I'm trying to enable Service Broker on a SQL Server 2012 database that is part of an availability group and keep getting this error message: The operation cannot be performed on database "dbname" ...
3
votes
1answer
74 views

Create Linked Server to AlwaysOn Availability Group Listener

I have an alwayson availability group setup using SQL 2014 and Windows Server 2012 R2. There are 3 nodes in the group. The SQL Service is running as a Managed Service account on each node (1 MSA for ...
3
votes
1answer
132 views

Manual Failover with AlwaysOn availability group

We are planning to upgrade our SQL 2012 to SQL 2014. We currently use a mirror for our production databases but are planning to move to availability groups. We are going to be running 2 SQL Servers on ...
3
votes
1answer
193 views

ApplicationIntent=ReadOnly Traffic when no Readable Secondary Available

We have a SQL 2012 AlwaysOn Availibility Group with 2 nodes. We have synchronous commit between the 2 replicas. They are both set to accept ReadOnly connections when acting as secondaries and to ...
3
votes
1answer
5k views

Do Availability Groups support Active/Passive?

I am looking into the licensing of SQL Server 2012 when using Availability Groups with 2 servers. It is not clear to me if Availability Groups are only available as Active/Active and not ...
3
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1answer
802 views

AG and SQL Backups

I am using always on in sql 2012 and have an AG setup. I would like to know if i were to backup the primary database and restore it would that be allowed without taking the cluster down etc. ...
3
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1answer
47 views

SQL Server 2014 Availability Group failed

I have 3 servers on VMware workstation: Win 2012 R2 as ADDC -Cluster service. Win 2012 R2 as SQL server primary replica . Win 2012 R2 as SQL server secondary replica (auto fail-over). My ...
3
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1answer
28 views

SQL Server 2012 Explicit transactions taking time with Always on Setup

We have a weird issue while we setup the AlwaysOn on Azure VM. We have explicit transactions in our stored procedures, and which are causing some delays and blocking when till the time we get the ...