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Understanding SYSDBA

I'm new to Oracle DB and trying to understand SYSDBA. I see use of OS authentication in my org whereby admins logon with / @SYSDBA. What does this mean at the DB layer?

  1. Do actions completed show up in the audit log as the actual OS user?
  2. Have I logged in as a user named SYSDBA or as the OS user or as some other user?

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