Oracle Middleware

Oracle AS Web Cache (Q&A)

The Oracle Web Cache is a powerful tool that can be used to significantly reduce the load on both the application server and the backend database. Oracle testing showed that placing Web Cache in front of the application server can reduce the back-end database load by 85%. However, it is important to configure Web Cache and you application/database properly.

2. How Web Caching Work ?

The steps for browser interaction with Oracle Web Cache follow:

A browser sends a request to a Web site named www.organization.com.
This request in turn generates a request to Domain Name System (DNS) for the IP address of for the Web site.
DNS returns the IP address of Oracle Web Cache, that is, 144.25.190.240.
The browser sends the request for the Web page to Oracle Web Cache, 144.25.190.240.
If the requested content is in its cache, Oracle Web Cache sends the content directly to the browser. This is called a cache hit.
If Oracle Web Cache does not have the requested content or the content is stale or invalid, it hands the request off to the application Web server. This is called a cache miss.
The application Web server sends the content through Oracle Web Cache.
Oracle Web Cache sends the content to the client and makes a copy of the page in cache.

3. Which is the Oracle Web Cache Directory Structure ?

Directory/File	Contents
`/bin` directory on UNIX `\bin` in the `ORACLE_HOME` directory on Windows	Contains the Oracle Web Cache binaries, including the `webcached` main executable and the `webcachectl` command-line tool. On UNIX, `webcachectl` is symbolically linked to the `$ORACLE_HOME/bin` directory, which is set in the path during installation.
`/docs` directory on UNIX `\docs` directory on Windows	Contains documentation and online help for Oracle Web Cache Manager
`/examples` directory on UNIX `\examples` directory on Windows	Contains unsupported Oracle Web Cache scripts for invalidation and personalized attributes and system administration scripts for debugging. Read `readme.examples.html` in the directory for further information about the scripts.
`internal.xml` and `internal_admin.xml` files	Contains internal configuration settings
`/lib` directory on UNIX	Contains library files
`/invalidation` directory on UNIX `\invalidation` directory on Windows	Contains the Document Type Definition (DTD) file `WCSinvalidation.dtd` for invalidation requests and responses
`/logs` directory on UNIX `\logs` directory on Windows	Contains event and access logs
`/mesg` directory on UNIX `\mesg` directory on Windows	Contains message files
`readme.html`	Contains important release information
`/utl` directory on UNIX `\utl` directory on Windows	Contains a utility to convert release 1.0 configuration files to a format supported by release 2.0
`webcache.xml`	Contains configuration parameters set by Oracle Web Cache Manager

More information about this subject ( Oracle AS Web Cache ) you can get from www.in-oracle.com

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