Dbms Keys(Engineering > Computer Science And Engineering > Dbms Questions And Answers ) Questions and Answers
Explanation:-
Answer: Option A. -> Lock timeoutLock timeoutThe timeout scheme is particularly easy to implement, and works well if transactions are short and if longwaits are likely to be due to deadlocks.
Explanation:-
Answer: Option A. -> ReferentialReferentialA relation, say r1, may include among its attributes the primary key of another relation, say r2. This attribute is called a foreign key from r1, referencing r2. The relation r1 is also called the referencing relation of the foreign key dependency, and r2 is called the referenced relation of the foreign key.
Explanation:-
Answer: Option A. -> No proper subset is a super keyNo proper subset is a super keyThe subset of a set cannot be the same set.Candidate key is a set from a super key which cannot be the whole of the super set