Concurrency control, distribution design, and query processing are key issues in the design of distributed databases. In this research, we have studied these issues with respect to a relational database on a local computer system connected by a multiaccess broadcast bus. A broadcast bus not only allows information to be distributed efficiently but also provides a synchronization tool for the concurrency control. Consequently, it simplifies the distributed database design. Some NP-hard file placement problems are found to be solvable in polynomial time when updates are broadcast.
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Abbott, Mark K. May ; Ph. Anderson, Andrew Rick, Ph. Baham, Eva Semien, M. May ; Professor Lester Cohen Ph. August ; Professor Harold D.
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Trustworthy data from untrusted databases. Rohit Jain , Purdue University. Increasingly, data are subjected to environments which can result in invalid malicious or inadvertent modifications to the data. For example, when we host the database on a third party server, or when there is a threat of insider attack or hacker attack.