TNS-03505 名称无法解析

问题现象:

[oracle@db01 admin]$ tnsping woo

TNS Ping Utility for Linux: Version 11.2.0.4.0 - Production on 15-JUN-2015 21:57:52
Copyright (c) 1997, 2013, Oracle.  All rights reserved.

Used parameter files:
TNS-03505: Failed to resolve name

[oracle@db01 admin]$ sqlplus system/oracle@PRI

SQL*Plus: Release 11.2.0.4.0 Production on Mon Jun 15 21:58:48 2015
Copyright (c) 1982, 2013, Oracle.  All rights reserved.

ERROR:
ORA-12154: TNS:could not resolve the connect identifier specified

Enter user-name: ^C[oracle@db01 admin]$ tnsp