system是数据库内置的一个普通管理员，你手工创建的任何用户在被授予dba角色后都跟这个用户差不多。sys用数据库的超级用户，数据库内很多重要的东西（数据字典表、内置包、静态数据字典视图等）都属于这个用户，sys用户必须以sysdba身份登录。以上就是2个用户的区别。另外你说的，sy...(more)

11. A production broker in a large bank is being configured to allow WebSphere Application Server to be the JMS provider. Defaults were used for directory paths during installation of the product. When creating a JMSProvider configurable service fo...(more)

1. A large bank has six brokers that are geographically dispersed. Three of the brokers are used in a publish/subscribe collective while three are not. For backup purposes, the decision has been made to use three cloned brokers. Which choice is the...(more)