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> MongoDB has identified a real pain point: many developers don't like to use SQL to interface with a transactional database.

The pain point relates less to SQL but more to the RDBMS and the rigid schema. SQL is spreading and may become a ubiquitous query language.

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The problem isn’t the schema, it’s that you must have exactly one at all times. Sometimes you need zero, sometimes you need many. Having a fixed schema in production reduces unpredictability and provides optimization opportunities. The journey to get to that fixed schema, however, generally benefits from more flexibility.

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