GATE & PSUs - Computer Science & Information Technology (CS & IT)

Concurrency Control & Two-Phase Locking (2PL) question bank (Database Management Systems (DBMS))

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Q1.

[Concurrency Control & Two-Phase Locking (2PL) Concept 5] A relation $R(A, B, C, D, E)$ has functional dependencies $F = \{ A \to B,\; BC \to D,\; D \to E,\; E \to A \}$. What is the candidate key and highest normal form of $R$?

(A)

Candidate keys are $\{AC, BC, DC, EC\}$; Highest normal form is 3NF

(B)

Candidate key is $\{A\}$; Highest normal form is BCNF

(C)

Candidate keys are $\{A, B, C\}$; Highest normal form is 2NF

(D)

Candidate key is $\{AC\}$; Highest normal form is 1NF

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Q2.

[Concurrency Control & Two-Phase Locking (2PL) Concept 11] A relation $R(A, B, C, D, E)$ has functional dependencies $F = \{ A \to B,\; BC \to D,\; D \to E,\; E \to A \}$. What is the candidate key and highest normal form of $R$?

(A)

Candidate keys are $\{AC, BC, DC, EC\}$; Highest normal form is 3NF

(B)

Candidate key is $\{A\}$; Highest normal form is BCNF

(C)

Candidate keys are $\{A, B, C\}$; Highest normal form is 2NF

(D)

Candidate key is $\{AC\}$; Highest normal form is 1NF

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