This blog focuses on transactional and message delivery behavior, particularly as it relates to microservice architectures. There are of course numerous areas to compare MongoDB, PostgresSQL, and Kafka with the converged Oracle DB and Oracle Transactional Event Queues/AQ that are beyond the scope of this blog.
The Oracle database itself was first released in 1979 (PostgresSQL was released in 1997 and MongoDB in 2009). Oracle Advanced Queuing (AQ) is a messaging system that is part of every Oracle database edition and was first released in 2002 (Kafka was open-sourced by LinkedIn in 2011 and Confluent was founded in 2014).