Built on SQL Server 2008, SQL Server 2008 R2 delivers higher mission-critical scale, more efficient IT, and expanded reporting and analytics through self-service business intelligence. SQL Server 2008 R2 introduces two new premium editions to meet the needs of large scale datacenters and data warehouses.
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SQL Server 2008 R2 Datacenter
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SQL Server 2008 R2 Parallel Data Warehouse
Link – http://www.microsoft.com/sqlserver/2008/en/us/R2-editions.aspx
