I met a problem from Oracle 12C Database, when I try to login to the user account with commandconn test/test, I got prompt of "invalid username/password, logon denied". 
when I use conn test/test@PDBORCL, I got "Could not resolve the connect identifier specified"
Can anyone please help me out? I really appreciate!!
Oracle 12c database cannot log in as a local user
oracleoracle-12c
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Best Answer
Strangely, changing my service name to UPPERCASE has helped!
Changed case of service name to UPPERCASE in
tnsnames.orafor pluggable database ("ORCLPDB" in my case).Follow below commands:
Note: service name in uppercase while connecting ex
SCOTT/TIGER@ORCLPDBNot sure why this has worked for me !!