1.YQL: Yahoo! Query Language (YQL)
http://developer.yahoo.com/yql/
YQL:
USE "http://your_domain_name/bart.xml" AS bart_table; SELECT name,eta FROM bart_table WHERE eta.destination LIKE "%SF%"
2.google vitess
https://code.google.com/p/vitess/wiki/ProjectGoals
Motivation and vision
Vtocc is the first usable product of vitess. It acts as a front-end to MySQL providing an RPC interface that accepts and transmits SQL commands. It is capable of efficiently multiplexing a large number of incoming connections (10K+) over a small number of db connections at reasonable throughput (~10kqps). It also has an SQL parser which gives the server the ability to understand and intelligently reshape the queries it …
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