文档解释
ORA-28081: Insufficient privileges – the command references a redacted object.
Cause: The command referenced a redacted column in an object protected by a data redaction policy.
Action: If possible, modify the command to avoid referencing any redacted columns. Otherwise, drop the data redaction policies that protect the referenced tables and views, or ensure that the user issuing the command has the EXEMPT REDACTION POLICY system privilege, then retry the operation. The EXEMPT REDACTION POLICY system privilege is required for creating or refreshing a materialized view when the materialized view is based on an object protected by a data redaction policy. The EXEMPT REDACTION POLICY system privilege is required for performing a data pump schema-level export including any object protected by a data redaction policy. All data redaction policies are listed in the REDACTION_COLUMNS catalog view.
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ORA-28081: Insufficient privileges（权限不足）是Oracle数据库中的一个错误码，表示用户没有足够的权限执行操作。它可能是由于用户缺少访问某个特殊对象（如表或函数）的必要权限而导致的。
官方解释
常见案例
一般处理方法及步骤
1. 确定错误的根源：通过使用Oracle数据字典视图，确定错误发生时用户所尝试访问的表或函数。
2. 确定用户权限：确定错误发生时，连接到数据库的用户拥有哪些权限。
3. 分配必要的权限：为用户分配正确的权限，以确保其具备执行该操作所需的访问权限。
