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Relational Operations Quizzes Online MCQs p. 320

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Relational Operations Questions and Answers


Languages based on the relational algebra, add a number of useful syntactic features, such as in



Secondary indices improve the performance of

Queries without keys
Queries without search keys
Queries with keys
Queries with search keys


To extract records from, and add records to the appropriate files to the database system, it needs

Different application programs
Similar application programs
Different application systems
Similar application systems


The point in the schedule where the transaction obtains its ?nal lock, is called its

Shrinking point
Growing point
Lock point
Phase point


Implementation of the simple structures at the logical level may involve complex

Physical-level structures
Logical-level structures
View-level Structures
Virtual-level Structures