Aster Data is a Map-Reduce system over databases. Just like Hadoop Map-Reduce over Hadoop/HDFS.
Going through following Link: http://www.asterdata.com/resources/developer-center.php
Video link: http://www.asterdata.com/resources/assets/webinars/HowtoPortJavaAppToSQL-MapReduce.mp4
Download Aster Data Developer Express Plug-in at Link: http://www.asterdata.com/download_developer_express/downloads.php
Video was interesting but voice clarity was really bad.
Small example link: http://www.asterdata.com/resources/assets/Tutorial-CubeRootFunction.pdf
Examples are explained well. Atleast I found it to be very informative.
Looks like Aster Data seems to have good future.
Please, post replies if you find information helpful or you would like to add something more.