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Differentiate between strict two-phase and rigorous two-phase with conversion protocol
Ans: Strict two-phase locking holds all its exclusive that is write locks until commit time, one time granted. When Rigorous two-phase locking is more restrictive as compared to standard 2PL in that it enforces the rule that no locks can be released through a transaction until after it commits or aborts. The former locks all its items previous to it starts thus once transaction starts, it is in its shrinking phase while latter does not unlock any of its items until after it terminates to the transaction is in its expanding phase till it ends.
Explain trivial dependency? Functional dependency of the form α ->β. is trivial if α C β. Trivial functional dependencies are satisfied by all the relations.
Order by clause By using this rows can be sorted It is used in the last portion of select statement By default it gets ascending order DESC: is used
Determine Which is not a consequence of concurrent operations? Ans: Update anomaly.
It defines that no primary key value can be null. This is as the primary key is used to recognize individual tuple in the relation. So we will not be able to recognize the records
Using the questions found at the end of Chapter 9 in your textbook, complete this homework activity. Students will submit a Word document answering questions 2, 3, and 4.
SET concept is used in which type of modelling? SET concept is used in Network Model.
sql is relationally complete-justify
example of embedded SQL query
please i request for your assistance in developing a case-based online phone repair
What are the several kinds of the update operations on relations? Also explain the constraints on these update operation. Give instance in support of your answer. There are th
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