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Which of the following is a procedure for acquiring the necessary locks for a transaction

Which of the following is a procedure for acquiring the necessary locks for a transaction

Which of the following is a procedure for acquiring the necessary locks for a transaction where all necessary locks are acquired before any are released?
(a)
    
Record controller
(b)
    
Exclusive lock
(c)
    
Authorization rule
(d)
    
Two phase lock
(e)
    
Three Phase lock.

Johnson 28-Dec-2017

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