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  1. To minimize disk I/O, which of these should be chosen?
    CHAR, VARCHAR
    1. either CHAR or VARCHAR
    2. any one
    3. CHAR
    4. VARCHAR
    5. None of these
Correct Option: D

In MySQL, because CHAR on average takes more space than VARCHAR, VARCHAR is preferred to be used to minimize the amount of the storage and disk I/O needed to process the rows.


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