General Notes on Oracle Data Dictionary The Oracle Data Dictionary contains metadata that is readily available via database views.

Oracle confirmed a second massive data breach The hacker gained access to sensitive information, including usernames, passwords, and encrypted passwords The FBI and cybersecurity firm CrowdStrike ...

(Download PDF of their paper.) "The paper published by SANS exposes the location in the Oracle data dictionary where the Oracle password hashes are stored.

This article explores the internals of materialized views and demonstrates how to precompute complex aggregates—having Oracle dynamically rewrite SQL to reference precomputed aggregate information.