This includes the ability for the external entity, such as a middleware server, to use the existing database connection under a different user without the need to authenticate the new connection user.

例如，一个外部实体，比如说一个中间件服务器，可以使用不同用户名下已有的数据库连接，而不需要对新的连接用户进行认证的能力。

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This may be a corporate LDAP server or it may be a database that is only used by a single application, but the repository of user and group information is external to the J2EE environment.

这可以是企业LDAP服务器，也可以是仅由单个应用程序使用的数据库，但用户和组信息的存储库位于J2EE环境之外。

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Before knowing if a user is authorized to do a particular operation, DB2 must be able to know the effective database authorization ID of the external user, and in which groups that user belongs.

在获知用户是否被授权进行特定操作之前，DB 2必须能够获知外部用户的有效数据库授权ID及其所属的组。

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