EXP-00056和 ORA-12154

  EXP-00056: ORACLE error 12154 encountered   ORA-12154: TNS:could not resolve service name   EXP-00000: Export terminated unsuccessfully 

  Cause: The import or export cannot find the net service name to connect to the database. Import and export connect to the database with the connect information (userid, password, and net service name) that the RAU used to connect. The net service name used by the RAU is in the tnsnames.ora file in the Designer Oracle home (unless a TNS_ADMIN registry variable is defined for the Designer Oracle home). 
報這個錯是由於，tnsname.ORA配置有問題，可用netca工具重新設定。