Basic DBA Query v.1: Oracle Database

BASIC DBA Query v.1 - 33 must know queries for DBAs

For those who want to learn database administration or are new to database administration, this query guide will help you finding basic information about your database instance.
It is designed for startup DBAs and people who are preparing for interviews in database administration. The information shared in this guide can also be referred by experienced professionals while working in their daily activities.