ORA-01998
        An administrative privilege cannot be revoked from the SYS user.
        
        
        Cause
        An attempt was made to revoke SYSOPER or SYSDBA administrative privileges from the SYS user which is not allowed.
        Action
        Review your requirements to determine a different approach.
        
     
    
    
        ORA-01998
        REVOKE failed: user SYS always has SYSOPER and SYSDBA
        
        
        Cause
        An attempt was made to revoke SYSOPER or SYSDBA administrative privileges from the SYS user which is not allowed.
        Action
        Try revoking administrative privilege from users other than SYS.
        
     
    
    
        ORA-01998
        REVOKE failed: user SYS always has SYSOPER and SYSDBA
        
        
        Cause
        An attempt was made to revoke SYSOPER or SYSDBA administrative privileges from the SYS user which is not allowed.
        Action
        Try revoking administrative privilege from users other than SYS.