Does the Oracle database username exist for each Linux account? Does the Oracle database username exist for each Linux account?

The former employee left the company and can not find the details at this time.

I can log in to the Linux root account and run a DB query through sqlplus.
If I log in as the Linux oracle account, I can not log in with the username that was logged in as the root account.

I do not know which setting I made.

I have a few questions,


As the title suggests, does the Oracle database username exist for every Linux account?
I'm wondering if there is a database username that can only be logged in to the Linux root account.
I would like you to give me a general idea of what configuration should be changed to run as the root account in the Linux oracle account.
Does the Oracle database username exist for every Linux account?


No - Operating System accounts and Oracle database accounts are unrelated.