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In competitive and fast moving world of systems, reliability for services is must required attribute. Systems that fail on regular basis are not at all accepted. Such level of reliability is provided by dependable systems. Mutation testing can be used to enhance the reliability of a system by keeping a check on completeness and effectiveness of test cases. This paper discusses need of dependable systems followed by discussions of database systems as dependable. After that use of mutation operators in procedural, Object Oriented and declarative systems is discussed. At the end some mutations for SQL Queries are suggested.
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