Microsoft SQL Server 2008 provides a data platform with many advantages and business benefits including better security, performance and scalability, developer productivity, and Business Intelligence tools (BI) – all at a lower total cost of ownership.
Better Performance and Scalability: SQL Data Services, Filtered Indexes, Advanced Sparse Columns, Column Prefix Compression
Better Security: Module Signing using Certificate, and integrated updates and patching
Better Business Intelligence (BI) tools: Optimized cube designers, on-demand processing and instance-based rendering, optimized integration with the 2007 Microsoft Office system
*Oracle provides only partial functionalities in these areas and requires additional licensing costs.