Autonomous JSON Database
Like other Oracle Autonomous Database services, it delivers automated patching, upgrading, and tuning. It performs all routine database maintenance tasks while the system is running, without human intervention.
Use Autonomous Database for Free
Oracle Autonomous Database provides an Always Free version that you can use to learn about service capabilities. It's also useful for development and testing activities.
The Always Free version is available at no cost for an unlimited time to Oracle Cloud Free Tier accounts and paying customers. You can have up to two Always Free databases per account. Always Free databases are subject to certain limits on the available CPU, storage, and simultaneous connections.
You can upgrade an Always Free database to a paid instance at any time.
For further information, see Always Free Autonomous Database.