Which database does Facebook & Google use ?

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.

U.S. has life of pi as population !



WASHINGTON
Figuring out the number of American residents got as easy as pi on Tuesday as the United States touched a rare mathematical and demographic milestone.
The Census Bureau said that the United States reached 314,159,265 residents, or the mathematical ratio pi times 100 million, shortly after 2:29 p.m. EDT (1829 GMT).
Pi, or 3.14159265, is the mathematical constant that is the ratio of a circle's circumference to its diameter. It often is approximated as 22/7.


"This is a once in many generations event ... so go out and celebrate this American pi," Census Bureau Chief Demographer Howard Hogan said in a statement.
The pi milestone is "very meaningful to mathematical statisticians," the statement said.
As of 3:54 p.m. EDT (1954 GMT), the bureau's population clock showed a U.S. population of 314,159,667. There were 7,032,793,077 people in the world check current population Here.

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