As you might know Oracle database system throws exception through ORA-XXXX message formats which has a meaning for the problem/issue you are facing.

Ever wondered how can you view/list all of these predefined exceptions in Oracle….I will show you by giving you an example of account being in a Locked state and trying to authenticate/connect against it you will face the famous ORA-28000 error exception:

The list of ORA-XXXX errors are defined in a file called “oraus.msg” under $ORACLE_HOME/rdbms/mesg directory: