MongoDB Questions and Answers – Master Slave Replication

This set of MongoDB Multiple Choice Questions & Answers (MCQs) focuses on “Master Slave Replication”.

1. Which of the following members should be hidden?
a) Delayed
b) Hidden
c) Primary
d) All of the mentioned
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2. Point out the wrong statement.
a) Clients will not distribute reads with the appropriate read preference to hidden members
b) Hidden members cannot vote in replica set elections
c) If you stop a voting hidden member, ensure that the set has an active majority or the primary will step down
d) None of the mentioned
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3. __________ operations cannot guarantee that the data files do not change.
a) db.lockl()
b) db.synclock()
c) db.fsyncUnlock()
d) secondary
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4. _______ may block reads, including those necessary to verify authentication.
a) db.lockall()
b) db.fsyncLock()
c) db,lockreads()
d) none of the mentioned
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5. Point out the correct statement.
a) In MongoDB, clients cannot see the results of writes before they are made durable
b) Users may configure read preference on a per-connection basis to prefer that the read operations return results from the secondary members
c) Clients cannot read data which may be subsequently rolled back
d) None of the mentioned
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6. ________ unlocks a mongod instance to allow writes and reverses the operation of a db.fsyncLock() operation.
a) db.fsyncUnlock()
b) db.fsynclock()
c) db.syncUnlock()
d) secondary
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7. Delayed members are a ________ or a running “historical” snapshot of the data set.
a) “rolling backup”
b) “roll backup”
c) “rolling commit”
d) none of the mentioned
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8. Delayed members apply operations from the _______ on a delay.
a) oplog
b) log
c) mlog
d) none of the mentioned
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9. In sharded clusters, delayed members have limited utility when the __________ is enabled.
a) Balancer
b) Collector
c) Emitter
d) None of the mentioned
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10. A delayed member has its priority equal to 0 and hidden equal to ___________
a) 0
b) flase
c) true
d) all of the mentioned
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