How does Scale-Out occur in MongoDB?

1.	How does Scale-Out occur in MongoDB?
Answer» The document-oriented data model of MongoDB makes it EASIER to split data across multiple servers. Balancing and loading data across a cluster is done by MongoDB. It then redistributes documents automatically. The mongos acts as a query router, providing an interface between CLIENT applications and the sharded cluster. CONFIG servers STORE metadata and configuration settings for the cluster. MongoDB uses the config servers to manage DISTRIBUTED locks. Each sharded cluster must have its own config servers.

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