What is the default login password for Oracle 12c?

Question

I just installed Oracle 12C on my home machine and didn't remember it asking to create any credentials during installation. Now, when I'm trying to connect to sample ORCL database, it's prompting one and not letting me in without!

Answer 1

Log on to the Oracle DB server machine as a user who installed it, so that you can access the db as SYS using:

sqlplus / as sysdba

When you get connected, you will be able to reset password for all the other users, including SYSTEM and the other “built-in” users as bellow:

ALTER USER user_name IDENTIFIED BY new_password;