授予 SELECT ANY TABLE 許可權後無法訪問sys 使用者的表，tablesys

授予 SELECT ANY TABLE 許可權後無法訪問sys 使用者的表，tablesys
SQL> show parameter dict

NAME                                 TYPE        VALUE
------------------------------------ ----------- -------------------------
O7_DICTIONARY_ACCESSIBILITY          boolean     FALSE ---------預設為false----設定為true後普通使用者擁有 select any table 許可權的就可以訪問 sys schema了
SQL> alter system set O7_DICTIONARY_ACCESSIBILITY=true scope=spfile

O7_DICTIONARY_ACCESSIBILITY 會控制普通用無法直接存取sys schema


FYI：O7_DICTIONARY_ACCESSIBILITY

Property	Description
Parameter type	Boolean
Default value	false
Modifiable	No
Range of values	true | false

O7_DICTIONARY_ACCESSIBILITY controls restrictions on SYSTEM privileges. If the parameter is set to true, access to objects in the SYS schema is allowed (Oracle7 behavior). The default setting of false ensures that system privileges that allow access to objects in "any schema" do not allow access to objects in the SYSschema.

For example, if O7_DICTIONARY_ACCESSIBILITY is set to false, then the SELECT ANY TABLE privilege allows access to views or tables in any schema except the SYSschema (data dictionary tables cannot be accessed). If O7_DICTIONARY_ACCESSIBILITY is set to false, then to access objects in the SYS schema, the user should have SELECT ANY DICTIONARY system privilege or the user should have been granted SELECT object privilege on the specific objects. The system privilegeEXECUTE ANY PROCEDURE allows access on the procedures in any schema except the SYS schema.

If this parameter is set to false and you need to access objects in the SYS schema, then you must be granted explicit object privileges. The following roles, which can be granted to the database administrator, also allow access to dictionary objects:

• SELECT_CATALOG_ROLE

• EXECUTE_CATALOG_ROLE

• DELETE_CATALOG_ROLE