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Is there any reliable and fast database architecture that allows to store a dictionary(containing up to hundred thousand words) using mongodb?

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For optimal performance, MongoDB schema design must be custom-tailored for each application's unique access patterns. It's better to study general MongoDB design techniques than specific architectures (which may not match your specific application).

Having said that, Wordnik is a great case-study:

  • Similar application: real-time dictionary
  • 20 billion records stored in 3.5 terabytes of MongoDB
  • Many online presentations sharing their MongoDB knowledge/experiences

Here is how Wordnik apparently modeled their words: enter image description here source: MongoDB Schema Design

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