What login problems you may encounter while logging into SQL*Plus?
There are a couple of common login problems. If you enter an incorrect
username or password, you will receive the following error message from Oracle
server:
ORA-01017: invalid username/password; logon denied
User should consult DBA (students should consult their instructor or
academic computing personnel) to resolve username/password problems.
If there is a connectivity issue between your client PC and Oracle or the host string has an invalid entry, you will see the following error message:
ORA-12154: TNS: could not resolve service name
Oracle stores host string/service values in a file called TNSNAMES.ORA. If
you receive a TNS error, call your DBA!
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