Best performance NoSQL database

There are many popular NoSQL options available, like Apache Cassandra, MongoDB, Redis, and Couchbase . Well, it totally depends upon your project; if it’s using Cassandra, then you probably need to learn Cassandra, and if it is using MongoDB, then you probably need to learn MongoDB.

SQL databases are better for multi-row transactions, while NoSQL is better for unstructured data like documents or JSON . SQL databases are also commonly used for legacy systems that were built around a relational structure.

ScyllaDB : A Monstrously Fast and Scalable NoSQL Database.