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103.

Which of the following concurrency control protocols ensure both conflict serializability and freedom from deadlock?
I. 2-phase locking
II. Time-stamp ordering
[1 mark]
(A) I only
(B) II only
(C) Both I and II
(D) Neither I nor II

last reply by CpjJwWHV • 14 years ago • asked in Computer Science And Engineering, 2010

View Comments [1 Reply]
104.

A relational schema for a train reservation database is given below
Passenger (pid, pname, age)
Reservation (pid, cass, tid)

What pids are returned by the following SQL query for the above instance of the tables? SELECT pid
FROM Reservation
WHERE class = ‘AC’ AND
EXISTS (SELECT *
FROM Passenger
WHERE age > 65 AND
Passenger . pid = Reservation . pid) [1 mark]
(A) 1, 0
(B) 1, 2
(C) 1, 3
(D) 1, 5

last reply by CpjJwWHV • 14 years ago • asked in Computer Science And Engineering, 2010

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105.

Consider a B⁺-tree in which the maximum number of keys in a node is 5. What is the minimum number of keys in any non-root node? [1 mark]
(A) 1
(B) 2
(C) 3
(D) 4

last reply by CpjJwWHV • 14 years ago • asked in Computer Science And Engineering, 2010

View Comments [1 Reply]
106.

Let L1 be a recursive language. Let L2 and L3 be languages that are recursively enumerable but not recursive. Which of the following statements is not necessarily true?
[1 mark]
(A) L2 – L1 is recursively enumerable
(B) L1 – L3 is recursively enumerable
(C) L2 ∩ L1 is recursively enumerable
(D) L2 ∪ L1 is recursively enumerable

last reply by CpjJwWHV • 14 years ago • asked in Computer Science And Engineering, 2010

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107.

Which one of the following is not a client server application? [1 mark]
(A) Internet chat
(B) Web browsing
(C) E-mail
(D) Ping

last reply by CpjJwWHV • 14 years ago • asked in Computer Science And Engineering, 2010

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108.

One of the header fields in an IP datagram is the Time to Live (TTL) field. Which of the following statements best explains the need for this field? [1 mark]
(A) It can be used to prioritize packets
(B) It can be used to reduce delays
(C) It can be used to optimize throughput
(D) It can be used to prevent packet looping

last reply by CpjJwWHV • 14 years ago • asked in Computer Science And Engineering, 2010

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