Database currently using by Market leader
Google - Bigtable
LinkedIn.com -
Oracle (Relational Database)MySQL (Relational Database
Stack Overflow - SQL Server.
Flickr uses MySQL.
YouTube uses MySQL but they are moving to Google's BigTable.
Myspace uses SQL Server.
Wikipedia uses MySQL.
Facebook.com
Hive (Data warehouse for Hadoop, supports tables and a variant of SQL called hiveQL). Used for "simple summarization jobs, business intelligence and machine learning and many other applications"
Cassandra (Multi-dimensional, distributed key-value store). Currently used for Facebook's private messaging.
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