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There is a nifty tool that you'll want to know about: tnsping. It does
what you'd expect, and is basically like testing DNS name resolution using ping instead
of a more appropriate tool. When you can't find a database via TNS it's pretty
handy for figuring out why.
bash-2.05$ tnsping testdb
TNS Ping Utility for Solaris: Version 10.1.0.2.0 -
Production on 11-OCT-2004 16:09:53
Copyright (c) 1997, 2003, Oracle. All rights reserved.
Used parameter files:
Used TNSNAMES adapter to resolve the alias
Attempting to contact (description = (address_list = (address =
(protocol = tcp) (host = 10.10.0.130) (port = 1521)))
(connect_data = (sid = test)))
OK (10 msec)
2005-02-10