Database Systems Exam MCQs – Practice Test 4 (Chapter 3)
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MCQ 16: In preemption technique, transactions are assigned a unique timestamp to decide whether it should wait or:
MCQ 17: Snapshot isolation is a scheme of:
MCQ 18: The two modes of locking a data item, are termed as 'shared' and:
MCQ 19: Two-phase locking does not ensure freedom from:
MCQ 20: A set of rules applied over a transaction that may lock and unlock each of the data items in the database, is known to be:
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