Consider the following two transactions: T 31 : read (A); read (B); If A = 0 then

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Consider the following two transactions:

T₃₁: read (A); read (B);

If A = 0 then B: = B + 1; write (B).

T₃₂: read (B); read (A);

If B = 0 then A: = A + 1; write (A).

Add lock and unlock instructions to transactions T₃₁ and T₃₂, so that they observe the two-phase locking protocol. Can the execution of these transactions result in a deadlock?

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Database System Concepts

ISBN: 978-0072554816

4th Edition

Authors: Henry F. Korth, S. Sudarshan

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Question Posted: Jan 29, 2011 01:42 AM

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Consider the following two transactions: T 31 : read (A); read (B); If A = 0 then

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a Lock and unlock instructions T 31 lockS A Read A LockX B Read B If A 0 Then ...View the full answer

Database System Concepts

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