20c 中新增的特性：
Addition of USER_APPLICATION_ROLES Data Dictionary View
Security → Core Security
Starting with this release the USER_APPLICATION_ROLES data dictionary view provides a subset of roles that are available in DBA_APPLICATION_ROLES that only apply to the current user.
Business Benefit: USER_APPLICATION_ROLES enables the current user to see all the application roles that have been granted to the user instead of the list of all possible application roles available in DBA_APPLICATION_ROLES.
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