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Which of the following information does the database system catalog store?(a) Number of tuples(b) Number of blocks(c) Size of a tuple of a relation(d) All of the mentionedI got this question in unit test.I'd like to ask this question from Estimating Statistics of Expression Results in chapter Query Processing and Optimization of RDBMS |
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Answer» CORRECT choice is (d) All of the mentioned Easy explanation: The database system CATALOG STORES the number of TUPLES, number of blocks, SIZE of a tuple in a relation and the blocking factor in it as statistical data. |
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