https://medium.com/@27.rahul.k/cassandra-ttl-intricacies-and-usage-by-examples-d54248f2853c > TTL stands for ‘Time To Leave’ . It’s a common functionality provided by many of new age DBs. > Modern DBs are designed for speed and scale and much of them have some constrained to achieve that, almost all major Nosql DBs let go of joins to provide a faster and scalable persistence system. Much of their extensible functionalities are at a nascent stage. Triggers, Stored Procedures, Views, Functions, Sessions, CDC etc.