许多人的互联网冒险是始于美国在线（AOL），CompuServe联机数据库系统或者Prodigy联机服务系统，其提供的网上服务包括电子邮件、聊天室、讨论区等等。
Many people first ventured onto the internet from AOL,CompuServe and Prodigy, which were subscription-based online services that offered e-mail, chatrooms, discussion boards and so on.
联机操作数据库系统的主要任务是执行联机事务和查询处理。
The major task of on-line operational database systems is to perform on-line transaction and query processing.
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