Oracle 10g, good one for starters
This zipped file is 167 MB and only requirement is Java/JRE on the system, which might be existing by default.
For more info, on what this contains check below :-


ORACLE 10G ADMINISTRATION·

Workshop I&II

100% video and sound quality.

Workshop I,II OCP + Exam Q&A
Over 64 hours of training


Overview Installing an Oracle Database

Oracle Database Structure

Accessing Oracle Database

Managing Oracle Database

Oracle Database Table spaces