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    Question

    Bitmap indexes are most efficient

    when:
    A Columns are high cardinality Correct Answer Incorrect Answer
    B Columns are low cardinality Correct Answer Incorrect Answer
    C Table has few rows Correct Answer Incorrect Answer
    D Table has no primary key Correct Answer Incorrect Answer
    E Foreign key constraints exist Correct Answer Incorrect Answer

    Solution

    Bitmap indexes are efficient for low-cardinality attributes (e.g., gender, status).

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