MongoDB Questions and Answers – Troubleshooting Sharded Cluster

This set of MongoDB Multiple Choice Questions & Answers (MCQs) focuses on “Troubleshooting Sharded Cluster”.

1. The preferred way to clear the _________ flag from a chunk is to attempt to split the chunk.
a) boolean
b) jumbo
c) change
d) all of the mentioned
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2. Point out the correct statement.
a) In some instances, MongoDB cannot split the no-longer jumbo chunk, such as a chunk with a range of single shard key value
b) To ensure that mongos instances update their cluster information cache, run flushConfig in the admin database
c) In a sharded cluster, you cannot use tags to associate specific ranges of a shard key with a specific shard or subset of shards
d) All of the mentioned
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3. _________ is used to remove tags from a particular shard.
a) sh.removeTag()
b) sh.removeShard()
c) sh.removeShardTag()
d) all of the mentioned
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4. ________ associates a shard with a tag or identifier.
a) sh.collects()
b) sh.addShardTag
c) sh.results()
d) all of the mentioned
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5. Point out the wrong statement.
a) You cannot overlap defined ranges, or tag the same range more than once
b) The mongod provides a helper for removing a tag range
c) The output from sh.status() lists tags associated with a shard, if any, for each shard
d) None of the mentioned
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6. To assign a tag to a range of shard keys use the _________ method when connected to a mongos instance.
a) sh.addTagRange()
b) sh.splitFind()
c) sh.Range()
d) all of the mentioned
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7. Each document in the tags holds the ________ of the sharded collection and a minimum shard key value.
a) tag
b) chunk
c) namespace
d) size
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8. Which of the following parameter represents minimum value of the shard key range to include in the tag?
a) min
b) max
c) maximum
d) minimum
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9. Use ________ to ensure that the balancer migrates documents that exist within the specified range to a specific shard.
a) sh.addShardTag()
b) sh.addTag()
c) sh.aShardTag()
d) all of the mentioned
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10. Which of the following parameter denotes name of the shard from which to remove a tag?
a) shard
b) tag
c) chunk
d) none of the mentioned
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