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.