This observation results in the fact that much more emphasis has to be placed on internal control mechanisms of systems, such as audit log analysis. For example, revealed that in computer systems the primary security threat comes from insider abuse rather than from intrusion.

Second, and more importantly, security policies do not sufficiently guard data stored in a database system against 'privileged users'. This observation holds for both general security policies as well as policies tailored to individual database users and applications. First, security policies are often not known or not well specified, making it difficult or even impossible to translate them into appropriate security mechanisms. Reality, however, shows that such mechanisms for enforcing organizational security policies are often not adequately used. In this, database systems play a center role because they not only allow the efficient management and retrieval of huge amounts of data, but also because they provide mechanisms that can be employed to ensure the integrity of the stored data.

In today's business world, information is the most valuable asset of organizations and thus requires appropriate management and protection. Anomaly Detection in Database Systems Motivation

What is anomaly in database