Which database does Facebook & Google use ?

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Facebook has moved to a NoSQL database named HBase. Google uses their own system called BigTable. What is NoSQL ? NoSQL is a term used to designate databases which differ from classic relational databases. NoSQL database management systems are useful when working with a huge quantity of data when the data's nature does not require a relational model. The data can be structured, but NoSQL is used when what really matters is the ability to store and retrieve great quantities of data, not the relationships between the elements.
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How to download books from Google books for Free

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Here is the trick to download google book and read it off line also.
How to do this?
Step 1: Download/ install Greasemonkey addon in Firefox
NOTE:- (It Customize the way a web page displays or behaves, by using small bits of JavaScript.)

Install this userscript:google book download
Download/ install the Flashgot (FlashGot is the free add-on for Firefox and Thunderbird, meant to handle single and massive ("all"and"selection") downloads with several external Download Managers. )
(Download/ ­ install Flashget(Download Manager)
Step 2: View your favorite book.
For Example: http:// ­ books.google.com/books?id=Tmy8LA ­a Vka8C&printsec= ­ ­frontcover
In the left panel, click Download this book Select all pages, right-click, choose FlashGot Selection Press OK to start downloading. 
Note :- Download only one page at a time, or your IP will be banned After the downloading is finished,in FlashGet, left panel, choose Downloaded folder.
Select all pages of the book, right-click, choose Rename -> put Filename..

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