Are indexes created automatically based on usage patterns in MongoDB?

In MongoDB, indexes are not created automatically based on usage patterns. Instead, they must be created manually by the developer or database administrator. This manual process allows for precise control over which fields are indexed, enabling optimized query performance tailored to the specific needs of the application.

By requiring that indexes be defined explicitly, MongoDB empowers users to understand and manage the performance trade-offs associated with index creation, such as increased storage requirements and potentially slower write operations.

The other options suggest varying degrees of automatic behavior for index creation, which does not align with MongoDB's operational model. Specifically, while it can analyze query performance and suggest indexes, it remains the user's responsibility to implement these suggestions and create indexes as deemed necessary for their application's performance.