Microsoft's SQL Server is one of the most secure database engines on the market.  The ability to encrypt data, manage permissions, and comply with HIPAA and PCI compliance requirements make it the best choice when Compliance is considered.

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Easily manage permissions around data access with User-Defined Server Roles.

Increase manageability and decrease complexity of database schema through Default Schema for Groups.

Control database access to deployed applications while improving manageability through Contained Database Authentication.

Help ensure compliance and increase manageability related to auditing with audit resilience, filtering and user-defined audit.

Built upon advanced security features (Transparent Data Encryption, Extensible Key Management, Kerberos authentication, and Policy-Based Management)