动态数据掩蔽系统视图

超级用户、具有 sys:operator 角色的用户和具有 ACCESS SYSTEM TABLE 权限的用户可以访问以下与 DDM 相关的系统视图。

下面是使用系统视图可以找到的一些信息示例。

--Select all policies associated with specific users, as opposed to roles
SELECT policy_name,
       schema_name,
       table_name,
       grantee
FROM svv_attached_masking_policy
WHERE grantee_type = 'user';     

--Select all policies attached to a specific user
SELECT policy_name,
       schema_name,
       table_name,
       grantee
FROM svv_attached_masking_policy
WHERE grantee = 'target_grantee_name'            
            
--Select all policies attached to a given table
SELECT policy_name,
       schema_name,
       table_name,
       grantee
FROM svv_attached_masking_policy
WHERE table_name = 'target_table_name'
      AND schema_name = 'target_schema_name';            
            
--Select the highest priority policy attachment for a given role
SELECT samp.policy_name,
       samp.priority,
       samp.grantee,
       smp.policy_expression
FROM svv_masking_policy AS smp
JOIN svv_attached_masking_policy AS samp
    ON samp.policy_name = smp.policy_name
WHERE
    samp.grantee_type = 'role' AND
    samp.policy_name = mask_get_policy_for_role_on_column(
        'target_schema_name', 
        'target_table_name', 
        'target_column_name', 
        'target_role_name')
ORDER BY samp.priority desc
LIMIT 1;         

--See which policy a specific user will see on a specific column in a given relation
SELECT samp.policy_name,
       samp.priority,
       samp.grantee,
       smp.policy_expression
FROM svv_masking_policy AS smp
JOIN svv_attached_masking_policy AS samp
    ON samp.policy_name = smp.policy_name
WHERE
    samp.grantee_type = 'role' AND
    samp.policy_name = mask_get_policy_for_user_on_column(
        'target_schema_name',
        'target_table_name',
        'target_column_name',
        'target_user_name')
ORDER BY samp.priority desc; 
         
 --Select all policies attached to a given relation.
SELECT policy_name,
schema_name,
relation_name,
database_name
FROM sys_applied_masking_policy_log
WHERE relation_name = 'relation_name'
AND schema_name = 'schema_name';