SQL Database Clustering

SQL Database Clustering Consulting Services

"Clustering" has become one of the biggest buzz words since SQL Server 2000 and Windows 2000 were introduced due to the improved manageability and reliability. Clustering in SQL Server 2000 is when two or more servers are configured to operate as a single virtual SQL Server to support database transactions. Each node or server in the cluster has the needed files installed locally as well as via a shared disk subsystem to support the SQL Server databases. A heart beat is used between the nodes to ensure each node is functioning properly, if not a failover occurs. Clustering is used to achieve high availability with SQL Server to support 24x7 operations to prevent a hardware failure from stopping an application from servicing client needs. .  

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How SQL Clustering Works

In a two-cluster node, one of the SQL Servers is referred to as the primary node, and the second one is referred to as the secondary node. In an Active/Passive cluster design, SQL Server will run on the primary node, and should the primary node fail, then the secondary node will take over.

When you build a two-node cluster using Windows 2000 Advanced Server and Microsoft Clustering Service, each node must be connected to a shared disk array using either SCSI cables or fibre channel.   

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What is an SQL Cluster?

Clustering is just one part of an entire strategy needed to help reduce application downtime. You will also need to purchase a shared disk array that offers redundancy, make tape backups, put the server behind a firewall, make sure your network connections have redundancy, use battery backup, and locate the server in a secure facility, among many other steps you can take. So don’t think that clustering is all you need for creating a highly available SQL Server. It is just one part.

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