a) In MongoDB 3.0, cursor.explain() returns the indexOnly field to indicate whether the index covered a query
b) When an index covers a query, MongoDB can both match the query conditions and return the results using only the index keys
c) For read-heavy applications, deploy sharding and add one or more shards to a sharded cluster to distribute load among mongod instances
d) All of the mentioned
Answer: b
Explanation: MongoDB does not need to examine documents from the collection to return the results.
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What is the output of the given code?
counter=1
if counter<=5
puts (counter)
counter=counter+1What is the output of the given code?
if(a==10 && b=9)
print “true”
else
print “false”
endWhich of the following are used for comparison?
What is the output of the given code?
a=10
b=9
if(a>b)
print (“a greater than b”)
else
print “Not greater”
endAssignment operator is also known as relational operator.
What is the output of the given code?
a=”string”
b=”strings”
if(a==b)
print (“a and b are same”)
else
print “Not same”
endWhat is the output of the given code?
test_1 = 17 > 16
puts(test_1)
test_2 = 21 <= 30
puts(test_2)
test_3 = 9 >= 9
puts(test_3)
test_4 = -11 > 4
puts(test_4)
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