What are the Responsibilities of Database Administrators?

What are the Responsibilities of Database Administrators?
Each database requires at least one database administrator (DBA). An Oracle Database system can be large and can have many users. Therefore, database administration is sometimes not a one-person job, but a job for a group of DBAs who share responsibility.

A database administrator's responsibilities can include the following tasks:
# Installing and upgrading the Oracle Database server and application tools
# Allocating system storage and planning future storage requirements for the database system
# Creating primary database storage structures (tablespaces) after application developers have designed an application
# Creating primary objects (tables, views, indexes) once application developers have designed an application
# Modifying the database structure, as necessary, from information given by application developers
# Enrolling users and maintaining system security
# Ensuring compliance with Oracle license agreements
# Controlling and monitoring user access to the database
# Monitoring and optimizing the performance of the database
# Planning for backup and recovery of database information
# Maintaining archived data on tape
# Backing up and restoring the database
# Contacting Oracle for technical support