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CHAPTER DOWNLOADS Oracle Application Server 10g administration handbook: The Web Cache John Garmany and Don Burleson 07.14.2004 Rating: -1.00- (out of 5) Digg This!     StumbleUpon     Del.icio.us    The following is the third part of a six-part series on Oracle Application Server 10g administration. Each tip is excerpted from the Osborne Oracle Press book, "Oracle Application Server 10g administration handbook," by John Garmany and Don Burleson. Check back frequently for the next installment, or go to the main series page for all installments. [TABLE]

The Oracle Application Server 10g Web Cache

The Oracle Application Server 10g Web Cache is designed to support not only a basic web server but also an application server creating dynamic data. For clarity we will refer to the Oracle Application Server 10g Web Cache as the Web Cache. We will refer to the Web Cache's internal cache as the cache. Web Cache integrates with any manufacturer's application server and can be used to load-balance a group of application servers. The Web Cache sits between the user and the application server. When a user requests a page, the Web Cache verifies that the page is still valid and if so, returns the page from the cache. If the page has expired or is marked stale, the Web Cache will request the page from the application server, send the page back to the user, and store it in the cache for future use.

Pages that consist of multiple objects that become stale at

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different times can be stored in the cache, and the Web Cache will request the stale objects from the application server and serve the valid object from its cache. This ability to mix static and dynamic content can significantly reduce the load on the application server. Before covering how the Web Cache knows when a document is stale, we need to discuss where Oracle's Web Cache fits into the web infrastructure.

Locating the Web Cache

Because Oracle's Web Cache not only caches static and dynamic content, but also load-balances across multiple application servers, there are many configurations available to meet individual needs.

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About the authors

A senior Oracle trainer with Burleson Consulting, John Garmany is also a respected Oracle expert and author and chosen by Oracle Press to write the "officially authorized edition" for the "Oracle Application Server 10g administration handbook." John also serves as a writer for DBAZine, "Oracle Internals" and has authored several popular Oracle books.

Don Burleson is one of the world's top Oracle database experts with more than 20 years of full-time DBA experience. He specializes in creating database architectures for very large online databases and he has worked with some of the world's most powerful and complex systems. Don's professional Web sites include www.dba-oracle.com and www.remote-dba.net.

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