Introduction

📘 Overview
This guide is a foundational reference for aspiring and junior Oracle Database Administrators (DBAs). It introduces key concepts and internal components of Oracle Database essential for managing real-world environments.

📌 Key Focus
Covers core architecture: database vs spreadsheet, DBMS types, Oracle editions, memory structures (SGA, PGA), storage (tablespaces, schema objects), and Oracle background processes.

💡 Real-World Relevance
Includes practical knowledge on Container Databases (CDB), Automatic Diagnostic Repository (ADR), system files, and key processes like PMON, SMON, LGWR, ARCn — all critical for tuning, troubleshooting, and uptime assurance.

Build a solid foundation in Oracle internals before advancing to backups, patching, replication, and high availability tasks.