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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

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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