Installing APEX is essentially creating database schemas and creating database objects like packages, views, tables, trigger, sequences, and indexes. APEX is a database-driven application that is built using the PL/SQL Oracle web toolkit; in fact, APEX is built using APEX.
From an administrator point of view, it is interesting to see what schemas are required for APEX to work. It is also interesting to understand how applications execute, connect to, and use the database. Like ...