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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Strange thing in sky

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Must try this :-
1. Open google maps ( Maps)
2. search for location 47.110579 9.227568
3. find the green arrow and click on street view
4. look 2X up and 2X left using circular navigation panel

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