MongoDB Questions and Answers – Read and Write Semantics

This set of MongoDB Multiple Choice Questions & Answers (MCQs) focuses on “Read and Write Semantics”.

1. The __________ of a replica set affects the outcome of failover situations.
a) deployment
b) architecture
c) structure
d) all of the mentioned
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2. Point out the wrong statement.
a) Administrators must apply or discard rollback data manually
b) Network partitions could not prevent the set from being able to form a majority
c) Replica sets remove “rollback” data when needed without intervention
d) None of the mentioned
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3. A rollback reverts _______ operations on a former primary when the member rejoins the replica set after a failover.
a) read
b) write
c) view
d) secondary
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4. A priority __ member is a secondary that cannot become primary.
a) 0
b) 1
c) 2
d) None of the mentioned
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5. Point out the correct statement.
a) Elections does not occur when the primary becomes unavailable and the replica set members autonomously select a new primary
b) A priority 1 member maintains a copy of the data set, accepts read operations, and votes in elections
c) In a two-member replica set, in one data center hosts the primary and a secondary.
d) None of the mentioned
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6. A second data center hosts one priority 0 member that cannot become ___________
a) primary
b) write
c) view
d) Secondary
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7. A ______ member maintains a copy of the primary’s data set but is invisible to client applications.
a) primary
b) delayed
c) hidden
d) none of the mentioned
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8. The db.________ method does not display hidden members.
a) isPrima ry()
b) isMaster()
c) Master()
d) none of the mentioned
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9. In a sharded cluster _______ do not interact with hidden members.
a) mongod
b) mongos
c) mongostore
d) all of the mentioned
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Sanfoundry Global Education & Learning Series – MongoDB.

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