Abstract: Real-time Database Systems (RTDBS) ought to fulfill timing constraints related to transactions. Usually, a timing constraint is stated as a deadline, which is characterized as a necessity to be utilized by schedulers. Currently, security becomes another significant challenge in several real-time systems. In many systems, sensitive information is expressed by numerous users with various levels of security clearance. More complicated database systems are now being employed in applications that need to support timeliness while coping with sensitive information. Key issues of real-time developers have been addressed in this paper. Furthermore, an extensive survey of real-time systems research has been presented. The survey classification of the proposed mechanisms has been proposed based on the security and concurrency control in RTDBS.
Keywords: Real-Time, security, concurrency control, transaction.