What Is the Oracle Database Cache Environment?
In a traditional multiple-tier environment running Web applications, the client (typically a Web browser) displays HTML or XML sent by an application running on the middle tier (usually a Web or application server). The middle tier gathers the information from the database server and translates the information into an HTML or XML page that can be displayed by the client. The database server tier stores, searches for, and retrieves data. The following figure shows an example of this Web-based, traditional, multiple-tier environment: Text description of the illustration trad_arch.gif In this environment, each user executes a database request using a distinct path from the Web browser through the Web server to the database, even if more than one user is requesting the same information. For example, assume that your database contains information about books, such as the book title, author, description, and ranking in a best-seller list. If User A and User B both request the list of the top
