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Introducing Windows Azure SQL Database

Microsoft Windows Azure SQL Database is a cloud-based relational database platform built on SQL Server technologies. By using Windows Azure SQL Database, you can easily provision and deploy relational database solutions to the cloud, and take advantage of a distributed data center that provides enterprise-class availability, scalability, and security with the benefits of built-in data protection and self-healing. 

Windows Azure SQL Database is the relational database service on the Windows Azure Platform. For more information about the Windows Azure Platform, see the Windows Azure platform Web site.

Key Benefits of the Service

The benefits of using Windows Azure SQL Database include manageability, high availability, scalability, a familiar development model, and a relational data model. 


Windows Azure SQL Database offers the scale and functionality of an enterprise data center without the administrative overheads that are associated with on-premise instances of SQL Server. This self-managing capability enables organizations to provision data services for applications throughout the enterprise without adding to the support burden of the central IT department or distracting technology-savvy employees from their core tasks in order to maintain a departmental database application.

With Windows Azure SQL Database, you can provision your data storage in minutes. This reduces the initial costs of data services by enabling you to provision only what you need. When your needs change, you can easily extend your cloud-based data storage to meet those needs.

High Availability

Windows Azure SQL Database is built on proven Windows Server and SQL Server technologies, and is flexible enough to cope with any variations in usage and load. The service replicates multiple redundant copies of your data to multiple physical servers to maintain data availability and business continuity. In the case of a hardware failure, Windows Azure SQL Database provides automatic failover to optimize availability for your application.


A key advantage of Windows Azure SQL Database is the ease with which you can scale your solution. After partitioning your data, the service scales as your data grows. A pay-as-you-grow pricing model makes sure that you only pay for the storage that you use, so that you can also scale down the service when you do not need it.

Familiar Development Model

When developers create on-premise applications that use SQL Server, they use client libraries that use the tabular data stream (TDS) protocol to communicate between client and server. Windows Azure SQL Database provides the same TDS interface as SQL Server so that you can use the same tools and libraries to build client applications for data that is stored in Windows Azure SQL Database. For more about TDS, see Network Protocols and TDS Endpoints.

Relational Data Model

Windows Azure SQL Database will seem very familiar to developers and administrators because data is stored in Windows Azure SQL Database just like it is stored in SQL Server, by using Transact-SQL. Conceptually similar to an on-premise instance of SQL Server, a SQL Database server is logical group of databases that acts as an authorization boundary.

Within each logical SQL Database server, you can create multiple databases that have tables, views, stored procedures, indices, and other familiar database objects. This data model makes good use of your existing relational database design and Transact-SQL programming skills, and simplifies the process of migrating existing on-premise database applications to Windows Azure SQL Database. For more about Transact-SQL and its relationship to Windows Azure SQL Database, see Transact-SQL Support (Windows Azure SQL Database).

SQL Database servers and databases are virtual objects that do not correspond to physical servers and databases. By insulating you from the physical implementation, Windows Azure SQL Database enables you to spend time on your database design.

See Also

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