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。

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.

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任何提供了有效用户ID和密码的用户都能够执行public组有权执行的操作。

Any user that supplies a valid user id and password has the ability to perform any operation the PUBLIC group has been granted.

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当来自备用源的匹配记录不包含有效的 ID 或者没有 ID时，您可能需要进行一组不同的操作，对于外部源，如 Acxiom，便是这种情况。

You may require a different set of actions when the matching records from an alternate source don't have a valid ID or have no ID; this would be the case for external sources like Acxiom.

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