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Which of the following statement(s) is/are true for two-phase locking?

Which of the following statement(s) is/are true for two-phase locking?

I.     Lock acquisition is the second phase
II.     Locks can be acquired at any time
III.    Keys are acquired in the first phase
IV.   Locks can only be acquired on primary keys
(a)Only (I) above
(b)Both (I) and (II) above
(c)Both (II) and (III) above
(d)Both (II) and (IV) above
(e)All (I), (II), (III) and (IV) above.

Jan 02 2018 View more View Less

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