3. |
Which is true about the data buffer hit ratio? (Choose all that apply)
Please select all the correct answers.
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A.
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The hit ratio only applies when a data block is requested more than once by Oracle.
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B.
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The hit ratio is more important than SQL tuning for database performance.
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C.
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The hit ratio should never fall below 90 percent, else Oracle performance will suffer.
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D.
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The hit ratio is very dynamic, and can change dramatically every minute.
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