(Answered) Investigating selectivitylook up selectivity in your

Management Studies

Investigating Selectivity

Look up selectivity in your database textbook. Essentially, the optimizer makes a decision regarding index use based on the fraction of results returned. Indexes are most useful when selecting a small fraction of the available records. You can conduct a simple experiment to find out where the cutoff percentage lies by developing a simple single table query and gradually shrinking (or growing) the query range.

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