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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.
What is the need for triggers? Triggers are useful mechanisms for alerting humans or for starting particular tasks automatically when particular conditions are met.
Difference between LEFT OUTER JOIN and RIGHT OUTER JOIN In left outer join tuples from the left-hand-side relation which do not match any tuple in the right-hand-side relation
Saving Derived Attributes to Avoid Re-computation Data that is derived from other data should be stored in the computed form to avoid re-computation. For this, we could define
Explain the Natural join Natural join is a binary operator which is written as (R* S) in which R and S are relations. The effect of the natural join is the set of all combinati
What are metrics for choosing the best algorithm? Matrices for choosing the best algorithms are as below: Computational complexity Ease of understand ability and im
i have assignments I don''t have time to finish because of work and other assignments, can you help with this? All are from the book Darabase design, application development and a
Question 1 Discuss on transmission impairments Question 2 What is framing? Question 3 Write a note on 10Base2 10Base- T Question 4 Explain the rev
Produce a set of relations (equivalent to the Finkelstein entity list) in third normal form (3NF) from the following un-normalised relation. You must use the Finkelstein methodolog
what is database management system? & why it is required?
explain the level architectures of the database management system
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