A data mart is a simple form of a knowledge factory that is targeted on only one topic (or efficient area), such as sales, finance or marketing. Information marts are often designed and managed by only one division within a company.
Each database requires at least one database manager (DBA) to manage it. Because an Oracle database program can be large and can have many customers, often this is not a one person job. In such situations, there is a group of DBAs who share liability.
Certifications are especially important to those looking for career in an area that often has many applicants competitive for a single place. Oracle certification reveals the prospective company that the applicant has made the dedication to “learn their trade” and has the qualifications and information to quickly become an effective participant of their employees.