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 Youtube Videos Without Any Sofware

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This is small and simple trick which will allow you to download youtube videos without any software and in different formats such as mpeg4,3gp, hd and many more from youtube.

First Go to Youtube webpage.
Then go to video you want to download.
Example : http://www.youtube.com/watch?v=8JRwNGFdTXM

Now add save before youtube and press enter.
Example : http://savemedia.com/watch?v=8JRwNGFdTXM
Now you will be redirected to a new page from where you can download video in any format of your choice.

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