翻译：
每个数据库至少需要一个数据库管理员（DBA），一个数据库系统有可能很大而且拥有很多用户。所以数据库管理员有时候不是一个人在工作，而是一个拥有DBA责任的DBA组的工作。
一个数据库管理员的职责有以下任务：
1.安装和更新数据库服务和应用程序工具。
2.为数据库系统分配系统存储和计划以后的存储需求。
3.在程序员设计好一个应用程序后创建基本的数据库存储结构（表空间）。
4.创建基本的对象（表，视图，索引）当程序员设计好应用程序之后。
5.在必要的时候修缮数据库的结构根据程序员的需求。
6.创建用户和维护系统的安全。
7.确保遵从oracle的许可说明。
8.控制和监测用户的的权限。
9.计划备份和恢复数据库的信息。
10.保存归档日志到磁盘上。
11.备份和恢复数据库。
12.联络oracle的技术服务支持。
原文：
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