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When ______________ is true, the mongod instance saves all documents migrated from the shard to the moveChunk directory of the storage.dbPath.

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When ______________ is true, the mongod instance saves all documents migrated from the shard to the moveChunk directory of the storage.dbPath.

(a) sharding.archiveChunks

(b) sharding.archiveMovedChunks

(c) shards.archiveMovedChunks

(d) rs.syncFrom()

This question was addressed to me during an internship interview.

This key question is from Replication Processes in section Replication Concepts, Processes and Replication Set of MongoDB

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The correct choice is (b) sharding.archiveMovedChunks

Easiest explanation: MongoDB does not delete data stored in moveChunk.

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