MongoDB Questions and Answers – Pipeline Optimization

This set of MongoDB Multiple Choice Questions & Answers (MCQs) focuses on “Pipeline Optimization”.

1. ______ expressions ignores the duplicate entries in each input array and the order of the elements.
a) set
b) boolean
c) aggregate
d) none of the mentioned
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2. Point out the correct statement.
a) To avoid parsing ambiguity if the argument is a literal array, you must wrap the literal array in a $lits expression or keep the outer array that designates the argument list
b) Expressions cannot include field paths and system variables, literals, expression objects, and expression operators
c) Operator expressions are similar to functions that take arguments
d) All of the mentioned
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3. ________ returns true if the input sets have the same distinct elements.
a) $setUnion
b) $setDifference
c) $setEquals
d) None of the mentioned
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4. Which of the following accepts any number of argument expression?
a) $setIntersection
b) $setDifference
c) $setEquals
d) None of the mentioned
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5. Point out the wrong statement.
a) Boolean expressions evaluate their argument expressions as booleans and return a boolean as the result
b) In addition to the false boolean value, Boolean expression evaluates as false the following: null, 0, and undefined values
c) Set expressions performs set operation on arrays, treating arrays as sets
d) None of the mentioned
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6. ________ returns a set with elements that appear in any of the input sets.
a) $setIntersection
b) $setDifference
c) $setEquals
d) $setUnion
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7. Which of the following performs a relative complement of the second set relative to the first?
a) $setIntersection
b) $setDifference
c) $setEquals
d) $setUnion
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8. $setIsSubset returns _______ if all elements of the first set appear in the second set, including when the first set equals the second set.
a) Null
b) True
c) False
d) None of the mentioned
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9. _______ accepts only single argument expression.
a) $setIsSubset
b) $bool
c) $anyElementTrue
d) None of the mentioned
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10. $allElementsTrue returns true if no element of a set evaluates to ____________
a) false
b) true
c) 0
d) 1
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