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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WHAT IS THE DIFFERENCE BETWEEN CORE I3, CORE I5, CORE I7

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QUESTION:- WHAT'S THE DIFFERENCE BETWEEN CORE I3, CORE I5, CORE I7...??
 
ANSWER:- The answer to most common but unanswered and confusion creating question is as follows :-
Core i3:-
* Entry level processor.
* 2-4 Cores
* 4 Threads
* Hyper-Threading (efficient use of processor resources)
* 3-4 MB Cache
* 32 nm Silicon (less heat and energy)
 
Core i5:-
* Mid range processor.
* 2-4 Cores
* 4 Threads
* Turbo Mode (turn off core if not used)
* Hyper-Threading (efficient use of processor resources)
* 3-8 MB Cache
* 32-45 nm Silicon (less heat and energy)
 
Core i7:-
* High end processor.
* 4 Cores
* 8 Threads
* Turbo Mode (turn off core if not used)
* Hyper-Threading (efficient use of processor resources)
* 4-8 MB Catche
* 32-45 nm Silicon (less heat and energy)

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