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Database on which WWW's biggest sites runs

Do you have question in mind that the big site specially social networking sites,where they stores our information?

They stores information in servers in which databases are hosted.Databases are nothing but the tools used to store information in structured form so that it can be analysed.

  Here  the list of big sites along with databases they are using:

        facebook.com     -      Hive,Cassandra linkedn.com        -      Mysql,Oracle microsoft.com    -      SQL Server 
        twitter.com          -      Mysql,Cassandra google.com         -      BigTable wikipeda.com     -      Mysql yahoo.com          -      Postgre SQL  






references:-
http://stackoverflow.com/questions/1113381/what-databases-do-the-world-wide-webs-biggest-sites-run-on

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