While arsing and buzzing on oracle web site, I found an useful tool, a flash application which available as an offline reference for ORACLE 11g R2 DB.
As it says ” Use this helpful reference as a cheat sheet for writing custom data dictionary scripts, locating views pertinent to a specific database component, and more.”
I thought of sharing it with everyone on the SCN community.
There are three main views in this application
Top DBA Views: Key DBA static data dictionary views and dynamic performance views organized by product feature areas
Architecture: A single diagram that illustrates the relationships between key database memory structures, processes, and storage
Background Processes: A comprehensive list that categorizes the background processes and flags which are new in Oracle
You can download this tool from this link.