Using Oracle Autonomous Database
Oracle Autonomous Database on Oracle Cloud Infrastructure delivers automated patching, upgrades, and tuning, without human intervention, and is supported for Oracle 19c.
PeopleSoft PeopleTools supports the use of Oracle Autonomous Database-Dedicated (ADB-D) and Autonomous Database-Serverless (ADB-S).
For reference information and migration instructions see https://docs.oracle.com/cd/E52319_01/infoportal/autonomous_database.html.
With ADB-S you can take advantage of Transparent Application Continuity to hide planned database maintenance, unplanned outages, and local rebalances of the database, ensuring that your applications are continuously available.