Microsoft SQL Server 2. Always. On Availability Groups Feature One of the most compelling features in the upcoming SQL Server 2. Denali) is the new Always. On Availability Groups. Microsoft's use of the term Always. On is a bit confusing. Always. On actually refers to two separate but related technologies: Always.

On Failover Clustering and Always. On Availability Groups. Always. On Failover Clustering is essentially the same thing as SQL Server failover clustering in earlier releases. It entails running a SQL Server instance on a Windows failover cluster. However, the Always.

On Availability Groups feature is completely new to SQL Server 2. SQL Server. If you're using database mirroring, Always. On Availability Groups could be a good reason to upgrade to SQL Server 2. Related: Upgrading Clusters to SQL Server 2. When Always. On Availability Groups Will Be Used After I describe the availability enhancements you'll find in Always. On Availability Groups, I'll tell you about the system requirements and the basic system setup. Install Sas Access Interface Pc Files Clean more.

I'll also show you how easy it is to configure and manage Always. On Availability Groups. Database mirroring is an effective technology for enhancing single database availability. However, database mirroring has several significant limitations: It's limited to a single failover partner. Although you can setup multiple database mirroring partnerships, each partnership can consist of only two systems and the optional witness (which doesn't actually maintain the mirrored data).

Although this works for simple applications, it doesn't adequately protect more complex multiple- database applications. You have to choose one or the other. To use the data in the mirrored databases, you must take point- in- time snapshots of them. They provide support for one primary replica and up to four secondary replicas, where each replica is located on a separate SQL Server instance running on different Windows failover cluster nodes. More important, Always.

On Availability Groups can contain multiple databases, all of which can be automatically failed over as a unit. This means that Always.

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On Availability Groups can protect multiple related databases and fail them over simultaneously. For example, if your application uses ASP. NET forms integration for authentication, you can fail over the default aspnetdb database in addition to your application's primary database. That way, the user authentication information can go along with your production data. Related: SQL Server 2.

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High Availability Another important advantage with Always. On is that you don't have to choose between asynchronous mode and synchronous mode, like you did with database mirroring. Always. On can have both synchronous and asynchronous replicas at the same time. Synchronous connections are typically used in high- availability scenarios, where there's automatic failover. Asynchronous connections are typically used in disaster recovery scenarios, where there's geographical distance between the different servers. Always. On Availability Groups enable you to have both types of protection simultaneously and can support a maximum of three synchronous replicas.

In addition, the replica databases are able to provide read- only access. This enables the replicas to be used for both reporting and backup purposes, potentially offloading some of the workload and I/O from the primary server. They can be either physical server systems or virtual machines (VMs). In addition, Always. On Availability Groups require Windows failover clustering, which means you have to use the Enterprise Edition (or higher) of Windows Server 2.

R2 or Windows Server 2. Fortunately, Windows failover clustering became much easier to set up beginning with Server 2. It's important to note that although Always. On Availability Groups require a Windows failover cluster, they don't require installing SQL Server as a clustered application. Systems databases can't be used. Read- only databases aren't supported.

The general steps to set up the SQL Server instances on Windows failover cluster nodes are as follows: 1. Use Server Manager to install the Failover Clustering feature on all nodes. Use the Failover Cluster Management tool to create a new Windows failover cluster. Install a new standalone instance of SQL Server on each cluster node.

For information about those steps, see . You can also find more information about this topic in the references listed in the Learning Path box. To begin, you first need to start the Always. On High Availability service on all the nodes that will be included in the availability group. The Always. On High Availability service isn't running by default. To start the service, open SQL Server Configuration Manager and select SQL Server Services in the navigation pane on the left.

Right- click the SQL Server (MSSQLSERVER) service and select Properties from the context menu. In the Always. On High Availability tab, select the Enable Always.

On Availability Groups check box, as shown in Figure 1. Click Apply. Stop, then restart the SQL Server service. From the context menu, select the New Availability Group Wizard. The wizard's walks you through configuring an availability group using the following pages: Introduction page.

The first page just summarizes the steps required to create a new availability group. Specify Availability Group Name page.

In this page, you supply the name for the availability group. For this example, I named it Penton. Editorial. DB. Select Databases page. You select the databases that will be included in the availability group in the Select Databases page. In Figure 2, you can see that I selected two databases: aspnetdb and Penton. Editorial. DB. The total number of databases that you can include is unlimited, but Microsoft recommends that you have no more than 1.

In practice, most organizations will only need a few. All the databases in the availability group will be protected and failed over as a unit. Specify Replicas page. Excel Open Multiple Windows Regedit Download. On the Replicas tab of the Specify Replicas page, you can add up to four secondary replicas. When the page is first displayed, it lists the local SQL Server instance in the primary role. This instance is the primary replica, and it allows read- write actions to be performed on all the databases in the availability group.

This displays a SQL Server connection dialog box in which you enter the SQL Server instance name and provide the authentication information for the system that will act as a secondary replica. All of the replicas you add will assume the secondary role. You can configure these databases to allow either no access or read- only access. SQL Server 2. 01. Table 1. The default replica mode is Automatic failover. This means that the replica will have the ability to automatically fail over and the connection between the primary and the secondary systems will use the synchronous mode.

The available connection modes for the secondary replicas are listed in Table 2. The default port is 5. Hadr. You can also choose whether to encrypt the data sent from the primary replica to the secondary replicas.

By default, the data sent between the endpoints is encrypted. Specify Availability Group Listener page.

In this page, you can create a DHCP listener for the availability group, as shown in Figure 4. The listener is designed to allow fast application failover after an availability group fails over by redirecting the application to one of the secondary replicas. The listener is configured as a DNS entry, and it initially points to the primary replica. In the event of a failover, the entry is updated to point to the secondary replica. Client connections can use this entry in their connection strings to connect to the databases in the availability group. Select Initial Data Synchronization page. Figure 5 shows the Select Initial Data Synchronization page, which is essentially the last page you need to configure.

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