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From MySQL AB]
GoldenGate and MySQL have introduced database tiering - a solution that allows you to augment your existing database infrastructure with a low-cost, high performance MySQL server farm. Database transactions are synchronized between the MySQL instances and other production databases in real-time while maintaining transaction integrity, and with support for very high volumes.
The article continues at
http://www.mysql.com/news-and-events/web-seminars/eds-goldengate-mysql.php