The idea behind Web Cache is fairly simple??”maintain copies of frequently
requested information in a cache so the information does not have to be retrieved
every time it is requested. Web Cache works on HTML pages and parts of pages. It
342 | Chapter 15: Beyond the Oracle Database
can cache either static or dynamic data and includes validation routines that you can
implement to specify when the data should be refreshed. Web Cache is aware of
individual user and application dependencies on data, so it automatically caches and
delivers situation-specific information.
HTML code uses Edge Side Includes to indicate where partial page content goes, and
Web Cache will use those directives to assemble pages with cached data. Web Cache
can also cache images, audio, video, Java, and search results.
Web Cache also compresses web pages, which can speed delivery to clients. Both
cache validation rules and compression rules can be implemented with regular
expressions for flexibility.
Web Cache instances can be on the same node as Oracle Application Server
instances, or on their own servers, as shown in Figure 15-2.
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