Managed Database Auditing with Amazon RDS Database Activity Streams for Amazon RDS for Oracle

Database Activity Streams (DAS) for Amazon Relational Database Service (Amazon RDS) for Oracle provides a near real-time stream of all audited statements (SELECT, DML, DDL, DCL, TCL) executed in your DB instance. The audit data is collected from the unified database audit, while the storage and processing of database activity is managed outside your database. This prevents database users and administrators from modifying the audit stream.

Source:: Amazon AWS