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What database engine does Google use?

Has Google published details of what their back end Database technology is?  Is their database based on a standard RDBMS (Oracle/DB2?) or a proprietry indexing system?

I am working with optimization engines and facing difficulties scaling using a standard RDBMS and I suspect I need a tool with a more specialised index structure as our data is typically very flat rather than highly relationship driven.  

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fzammer
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fzammer
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asimkovskyCommented:
Google runs Oracle, as many of the other search engines do.  Not sure what version, though.



Andrew
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walterecookCommented:
No comment has been added lately, so it's time to clean up this TA.
I will leave the following recommendation for this question in the Cleanup topic area:

Accept: asimkovsky {http:#8139023}

Please leave any comments here within the next four days.
PLEASE DO NOT ACCEPT THIS COMMENT AS AN ANSWER!

walterecook
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asirkiaCommented:
Google actually built its own database from scratch, and it's a wholly different type of software, called a "flat file" database, according to Craig Silverstein, Google's director of technology.

http://www.smartmoney.com/techmarket/index.cfm?story=20000706
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asirkiaCommented:
Google presentation by Sergey Brin and Lawrence Page (Google Founders) for the Computer Science Department, Stanford University :

http://www-db.stanford.edu/~backrub/google.html
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