How to choose database between mongodb and cassandra?

@wilmer.lemke 

When choosing between MongoDB and Cassandra for your database needs, there are several factors to consider:

1. Data Model: MongoDB is a document-oriented database, which means it stores data in JSON-like documents that can vary in structure. It is a good choice for applications with complex data structures. Cassandra, on the other hand, is a wide-column store database that is optimized for high write throughput and can handle large amounts of data. It is a good choice for applications that require fast writes and reads of large datasets.
2. Scalability: Both MongoDB and Cassandra are designed to be scalable, but they have different approaches to scaling. MongoDB uses sharding to distribute data across multiple servers, while Cassandra uses a distributed architecture that allows for linear scalability. If your application requires high scalability and high availability, Cassandra may be the better choice.
3. Consistency: MongoDB is a consistent database, which means that data is always up-to-date and accurate. Cassandra, on the other hand, is eventually consistent, which means that updates are propagated to all nodes in the cluster asynchronously. If your application requires strong consistency, MongoDB may be a better choice.
4. Querying: MongoDB has a more flexible querying language that is similar to SQL, making it easier to work with for users familiar with relational databases. Cassandra has a more limited querying language that requires users to design their data model around their query requirements. If your application requires complex querying capabilities, MongoDB may be a better choice.
5. Use case: Consider the specific requirements and goals of your application when choosing between MongoDB and Cassandra. If you need a flexible data model and strong consistency, MongoDB may be the better choice. If you need high scalability and fast write performance, Cassandra may be the better choice.

Ultimately, the best way to choose between MongoDB and Cassandra is to evaluate your specific use case and requirements, and to test both databases to see which one best meets your needs.