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 KNOW WHETHER A KEYLOGGER IS INSTALLED ON UR COMPUTER OR NOT?

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How does keyloggers enters your computer ?
There are several ways in which a key logger can get into your computer either it is directly installed or it is indirectly transferred to your computer. Most of the time, this malicious file enters a computer
when the user downloads an infected application like movies, music or other software applications.
So how to get rid of keyloggers that is installed on a computer
1. Use updated antivirus and anti spyware
Some of the good anti viruses have capability to detect key loggers. So you should update your antiviruses regularly so that it gets updated for new keyloggers.

2. Use Anti keyloggers There are anti keyloggers available that will make the task easy for you in finding a keyloggers. Use these softwares if you think there is a high possibility of keyloggers on a computer. The anti keyloggers that i will suggest you is Cyberhawk. Even Kasperky does a good job in this area too. Also check anti-spy.info.
More examples:
· http://www.microsoft.com/
· http://www.lavasoftusa.com/
· http://security.kolla.de/
· http://www.clamwin.com/
3. Search for keyloggers yourself Keyloggers have the capability that they hide them self from the user but are active in the background. There are some shortcuts that are used to see them live on screen
For example : Ctrl + Alt + X or Ctrl+ Alt + Wondows Key + X or desktopshark etc.
4. Use special tools 
KL-Detector Freeware on demand keylogger scanner.
SnoopFree Freeware antikeylogger that block hook based keyloggers as well as screen captures. For Windows XP.
PSMAntiKeyLogger PSMAntiKeyLogger is a real-time protecting software which protects you against Keyloggers. No scanning is needed.
I Hate Keyloggers Freeware antikeylogger that block hook based keyloggers. For Windows 2000 and XP.

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