안녕하세요.

Data Pump 공부 중 Error가 생겨 질문 올립니다.

SQL> select * from dba_db_links order by owner, db_link;

OWNER      DB_LINK    USERNAME   HOST       CREATED    HID SHA VAL INT
---------- ---------- ---------- ---------- ---------- --- --- --- ---
SYS        RHEL19C    DUMPUSER   oralink    30-SEP-22  NO  NO  YES NO
SYS        SYS_HUB               HWEE       19-AUG-22  NO  NO  YES NO
 

expdp system/ directory=DUMP dumpfile=test5_exp.dmp logfile=test5_exp.log full=y  include=DB_LINK,PUBLIC_SYNONYM

Export: Release 19.0.0.0.0 - Production on Tue Oct 4 11:27:06 2022
Version 19.14.1.0.0

Copyright (c) 1982, 2019, Oracle and/or its affiliates.  All rights reserved.

Connected to: Oracle Database 19c Enterprise Edition Release 19.0.0.0.0 - Production
Starting "SYSTEM"."SYS_EXPORT_FULL_01":  system/******** directory=DUMP dumpfile=test5_exp.dmp logfile=test5_exp.log full=y include=DB_LINK,PUBLIC_SYNONYM
ORA-31655: no data or metadata objects selected for job
Job "SYSTEM"."SYS_EXPORT_FULL_01" completed with 1 error(s) at Tue Oct 4 11:27:10 2022 elapsed 0 00:00:03
 

다음과 같이 DB_link가 분명 존재하는데, ORA Error 가 발생하는 이유가 무엇일까요?