Elance Exams Answers PDF file

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Which of the following falsely sums up Oracle’s locking policy?

Oracle never locks data just to read it. There are no locks placed on rows of data by simple reads
Oracle locks data at the row level on modification. There is no lock escalation to a block or table level
A writer of data is blocked only when a reader of data has already locked the row it was going after.
A reader of data never blocks a writer of data
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