MongoDB Questions and Answers – Sharding Mechanics

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

1. The _________ process is responsible for redistributing the chunks of a sharded collection evenly among the shards for every sharded collection.
a) Balancer
b) Sharder
c) Replicator
d) All of the mentioned
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2. Point out the correct statement.
a) Splitting is the process MongoDB uses to distribute data of a sharded collection evenly across a sharded cluster
b) Any mongos instance in the cluster can start a balancing round
c) When a shard has too many of a sharded collection’s chunks compared to other shards, MongoDB splits balances the chunks across the shards
d) All of the mentioned
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3. Use _______ migration to distribute data during bulk inserts.
a) automatic
b) manual
c) temporary
d) all of the mentioned
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4. The balancer process sends the _______ command to the source shard.
a) moveChunkShard
b) migChunk
c) moveChunk
d) all of the mentioned
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5. Point out the wrong statement.
a) When fully synchronized, the destination shard connects to the config database and updates the cluster metadata with the new location for the chunk
b) The destination shard builds any indexes required by the source that do not exist on the destination
c) The destination shard begins requesting documents in the chunk and starts receiving copies of the data
d) None of the mentioned
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6. The source shard is responsible for incoming ______ operations for the chunk.
a) read
b) write
c) read-write
d) all of the mentioned
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7. ________ can alter the behavior so that the delete phase of the current migration blocks the start of the next chunk migration.
a) _waitForUpdate
b) _waitForDelete
c) _waitForInsert
d) All of the mentioned
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8. The default value _________ becomes true for all chunk migrations.
a) secThrottle
b) secondaryThrottle
c) primaryThrottle
d) all of the mentioned
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9. You can set the _________ option on the balancer configuration to set different write concern semantics.
a) writeConcern
b) updateConcern
c) readConcern
d) all of the mentioned
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10. With __________ enabled, the source shard archives the documents in the migrated chunks in a directory named after the collection namespace.
a) sharding.archiveChunks
b) sharding.archiveMovedChunks
c) shard.archiveMovedChunks
d) none of the mentioned
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