Internet domains are categorized into the Content Database by the categorization engine, and are referenced by the Content Filter Object to control access to Internet websites. The categorizations are also used to manage spam mail traffic.
The Categorized Domains lets you review the contents of this portion of the content database, examine the categorization details of the records within and perform database maintenance actions as necessary.
The Tools page includes a table-related database SEARCH utility and TOOLBOX utilities to assist with viewing and managing the contents of the table.
Content Database Shared Tables - online Help