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DBMS Korth Edition 4 Exercise 16 Question 16 (Page No. 634)
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In multiple-granularity locking, what is the difference between implicit and explicit locking ?
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DBMS Korth Edition 4 Exercise 16 Question 18 (Page No. 634)
Use of multiple-granularity locking may require more or fewer locks than an equivalent system with a single lock granularity. Provide examples of both situations, and compare the relative amount of concurrency allowed.
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DBMS Korth Edition 4 Exercise 16 Question 17 (Page No. 634)
Although SIX mode is useful in multiple-granularity locking, an exclusive and intend-shared (XIS) mode is of no use. Why is it useless ?
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DBMS Korth Edition 4 Exercise 16 Question 15 (Page No. 634)
When a transaction is rolled back under timestamp ordering, it is assigned a new timestamp. Why can it not simply keep its old timestamp ?
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DBMS Korth Edition 4 Exercise 16 Question 14 (Page No. 634)
In timestamp ordering,$W-timestamp(Q)$ denotes the largest timestamp of any transaction that executed $write(Q)$ successfully. Suppose that, instead, we defined it to be the timestamp of the most recent transaction to execute $write(Q)$ successfully.Would this change in wording make any difference ? Explain your answer.
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