解决DBMS_FILE_TRANSFER.PUT_FILE（）期间的解决ORA-02019错误

Question

I am using DBMS_FILE_TRANSFER.PUT_FILE() on a local Oracle Express instance to transfer a local file to a remote AWS RDS Oracle instance, but I am receiving the following error:

ERROR at line 1:
ORA-02019: connection description for remote database not found
ORA-06512: at "SYS.DBMS_FILE_TRANSFER", line 60
ORA-06512: at "SYS.DBMS_FILE_TRANSFER", line 168
ORA-06512: at line 2

I receive this error while executing the following SQL script:

BEGIN
   DBMS_FILE_TRANSFER.PUT_FILE(
   'DATA_PUMP_DIR',
   'some_file.txt',
   'DATA_PUMP_DIR',
   'some_file.txt',
   'MY_DATABASE_LINK'
   );
END;
/

MY_DATABASE_LINK is a public database link located in my local Oracle Express instance:

CREATE PUBLIC DATABASE LINK MY_DATABASE_LINK CONNECT TO example_schema IDENTIFIED BY "example_user" USING '(DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=example_host_info)(PORT=1521))(CONNECT_DATA=(SID=example_sid)))';

I'm fairly confident that the connection string behind the database link is correct, but I'm not sure how to be 100 ％ 当然。

ORA-02019：找不到远程数据库的连接描述错误是没有意义的，因为连接描述是由数据库链接定义的。它不存在于tnsnames.ora中，我相信它不必用于dbms_file_transfer.put_file（）才能工作。