文中还介绍了DB 2UDB安全模型，包括用户身份验证、用户和组授权以及超级用户。
It also reviews the DB2 UDB security model, including user authentication, user and group authorization, and super users.
但这比你所想到的要少得多，这是因为很多超级用户通过学习实现模型已经显示了自己的能力和耐力。
This is because these power users have already shown their ability and tolerance by learning the implementation model.
但这比你所想到的要少得多，这是因为很多超级用户通过学习实现模型已经显示了自己的能力和耐力。
This is because these power users have already shown their ability and tolerance by learning the implementation model.
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