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631.

Which of the following is a valid first order formula? (Here α and β are first order formulae with x as their only free variable) [2 marks]

asked in Computer Science And Engineering, 2003

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632.

Let (S, ≤) be a partial order with two minimal elements a and b, and a maximum element c. Let P: S -> {True, False} be a predicate defined on S. Suppose that P(a) = True, P(b) = False and P(x) ⇒ P(y) for all x, y ∈ S satisfying x≤y,
where ⇒ stands for logical implication. Which of the following statements
CANNOT be true? [2 marks]
(A) P(x) = True for all x ∈ S such that x ≠ b
(B) P(x) = False for all x ∈ S such that x ≠a and x ≠ c
(C) P(x) = False for all x ∈ S such that b ≤ x and x ≠ c
(D) P(x) = False for all x ∈ S such that a ≤ x and b ≤ x

asked in Computer Science And Engineering, 2003

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633.

Consider the following SQL query
select distinct a₁, a₂, ..., a_n
from r₁, r₂, ..., r_m
where P
For an arbitrary predicate P, this query is equivalent to which of the following relational algebra expressions? [1 mark]

asked in Computer Science And Engineering, 2003

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634.

Which of the following scenarios may lead to an irrecoverable error in a database system? [1 mark]
(A) A transaction writes a data item after it is read by an uncommitted transaction
(B) A transaction reads a data item after it is read by an uncommitted transaction
(C) A transaction reads a data item after it is written by a committed transaction
(D) A transaction reads a data item after it is written by an uncommitted transaction

asked in Computer Science And Engineering, 2003

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635.

Which of the following functionalities must be implemented by a transport protocol over and above the network protocol? [1 mark]
(A) Recovery from packet losses
(B) Detection of duplicate packets
(C) Packet delivery in the correct order
(D) End to end connectivity

asked in Computer Science And Engineering, 2003

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636.

Which of the following assertions is FALSE about the Internet Protocol (IP)?
[1 mark]
(A) It is possible for a computer to have multiple IP addresses
(B) IP packets from the same source to the same destination can take different routes in the network
(C) IP ensures that a packet is discarded if it is unable to reach its destination within a given number of hops
(D) The packet source cannot set the route of an outgoing packets; the route is determined only by the routing tables in the routers on the way

asked in Computer Science And Engineering, 2003

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