Being schemaless is one of the key features of MongoDB. On the bright side this allows developers to easily modify the schema of their collections without waiting for the database to be ready to accept a new schema. However schemaless is not free and one of the drawbacks is write amplification. Lets focus on that [&]

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https://www.percona.com/blog/2015/05/05/mongodbs-flexible-schema-how-to-fix-write-amplification/