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You want a record of all queries that are not using indexes. How would you achieve this?（）
A:By enabling the Slow Query Log because all queries that are not using indexes will be logged automatically
B:By enabling the Error Log because not using indexes is an error
C:By enabling the Slow Query Log and using the – log-queries-not-using-indexes option
D:By enabling the Error Log and using the – log-queries-not-using-indexes option

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出自：Oracle认证

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