今天写了一个存储过程，需要通过dblink把其他用户下面的表的数据增量copy到目标表中，结果访问其他系统的表的时候，在存储过程中一直有问题，在Stack Overflow中找到了答案。
In stored procedures, functions, and definers-rights packages, roles (such as
SELECT_CATALOG_ROLE) are disabled. Therefore, such a PL/SQL program can only fetch metadata for objects in its own schema . If you want to write a PL/SQL program that fetches metadata for objects in a different schema (based on the invoker's possession ofSELECT_CATALOG_ROLE), you must make the program invokers-rights.
To do this, you must add
authid
to your procedure.
create procedure tests authid CURRENT_USER is
l_foo clob;beginselectregexp_replace(
dbms_metadata.get_ddl('USER', 'SCOTT', null) ||
dbms_metadata.GET_GRANTED_DDL ('SYSTEM_GRANT', 'SCOTT') ||
dbms_metadata.GET_GRANTED_DDL ('OBJECT_GRANT', 'SCOTT') ||
dbms_metadata.GET_GRANTED_DDL ('ROLE_GRANT', 'SCOTT'),'"' || chr(10), '";' || chr(10)) into l_foo
from dual;end;/SQL> EXEC tests
PL/SQL procedure successfully completed
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