Abstract
Database systems for real-time applications must satisfy timing constraints associated with transactions. Typically a timing constraint is expressed in the form of a deadline and is represented by a priority to be used by schedulers. In many real-time applications, security is another important requirement, since the system maintains sensitive information to be shared by multiple users with different levels of security clearance. As more advanced database systems are being used in applications that need to support timeliness while managing sensitive information, protocols that satisfy both requirements need to be developed.
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