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 speed up the files transfer on pen drive

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If your Pen Drive File Transfering speed is slow here is the way to speed it up 
NOTE:-Please be sure you  have not saved any data on your usb drive before doing this 
> Connect your pen drive
> go to "my Computer"
> Right Click on "Removable device" which is your Pen Drive letter
> Now Select the Last Option that is "Properties"
> Go to "Tools" option
> Select "check disk error" and Click OK
> Now Again Right Click on your
Pen drive and Select "Format" option
> Click on "Default value"
> uncheck the "Quick Format" option
> Click on Format
Note: Please wait as this will take some time to finish ,now next time you use your usb observe the changed transfer rate.

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