How to drop/create Database Link from another schema?

SQL> CREATE or replace PROCEDURE scott.create_db_link AS
BEGIN
EXECUTE IMMEDIATE 'create database link LINK1 connect to scott identified by tiger using ''testdb''';
END create_db_link;
2 3 4 5
6 /

Procedure created.

SQL> show user
USER is "SYS"
SQL> exec scott.create_db_link

PL/SQL procedure successfully completed.

SQL> select * from dba_db_links where OWNER='SCOTT';

OWNER DB_LINK USERNAME HOST CREATED
------------------------------ -------------------- ------------------------------ -------------------- ---------
SCOTT LINK1 SCOTT testdb 04-NOV-11

SQL> drop database link scott.LINK1;
drop database link scott.LINK1
*
ERROR at line 1:
ORA-02024: database link not found


SQL> CREATE PROCEDURE scott.drop_db_link AS
BEGIN
EXECUTE IMMEDIATE 'drop database link LINK1';
END drop_db_link; 2 3 4
5 /

Procedure created.

SQL> exec scott.drop_db_link

PL/SQL procedure successfully completed.

SQL> select * from dba_db_links where OWNER='SCOTT';

no rows selected

SQL>