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Sorting of relations that do not fit in memory is called as _______

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Sorting of relations that do not fit in memory is called as _______

(a) Internal sorting

(b) External sorting

(c) Overflow sorting

(d) Overload sorting

I got this question in unit test.

Question is from Query Processing topic in chapter Query Processing and Optimization of RDBMS

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Correct choice is (b) External sorting

The explanation: Sorting of relations that do not fit in memory is called as external sorting.

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