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Corruption. In MySQL if a database (more likely a few tables) become corrupt, you can repair them individually. In MongoDB, you have to repair on a database level. There is a command to do this but it reads all the data and re-writes it to a new set of files.
Sharding in MongoDB. 1  Shards â Shards are used to store data. They provide high availability and data consistency. In production environment, each shard is a separate replica set. 2  Config Servers â Config servers store the cluster's metadata. This data contains a mapping of the cluster's data set to the shards.