Riak can also be viewed as a document database, though with more flexibility about document types.

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Two airlines, Qatar Airways and Air Arabia, will have limited access to the Stolen and Lost Travel Document database.

BBC: How safe is your passport?

In a document database, such as CouchDB or MongoDB, documents are key-value pairs.

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Finally it dumps the entire database into its parallel processors and finds every document that could be relevant.

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Despite the document, White House deputy press secretary Barry Toiv denied that the database, which included information on over 200, 000 donors, supporters, friends, legislators, dignitaries and journalists, was used for political purposes.

CNN: Memos Suggest White House Database Used To Reward Donors