Someone claims that google use oracle, someone claims that google use MySQL database in order to maintain their search engine indexing. But as far as I know neither is true. Google crawler crawls millions pages over the internet and make Google Spreadsheets and thus form a Database.
So their database is just a flat file which is visible and readable by everyone.
You can think it as a normal excel file with some fields and under the fields the entry of different websites and their content are put. If crawler detects any changes in the page then the entry under the webpage is modified.
Google uses it's own API in order to find out any matches for searched words from the spreadsheets.
Thus for search engine indexing google uses spreadsheets.
But google's other application like google mail, blogspot, google doc etc uses a database. They use MySQL and or oracle for other applications. Of course they modified the version of database and use that one.
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