One of the primary security principles is authentication.
Authentication is the process of confirming the identity of a user. Users access the database by way of user accounts. In order to successfully log in to a database, a user must pass through some form of authentication, often by way of a user account name and password. To review what we've learned in previous chapters, there are two major default administrative accounts in Oracle called
SYS account is the highest administrative account available. It owns the data dictionary and has the power to do any type of administrative activity. The
SYSTEM account is comparable in terms of authority, but does not own the data dictionary.