Do you want to learn about concepts and mechanics of In-Memory Data management ?
The Hasso Plattner Institute in Potsdam/Germany provides a Learning Platform with online courses.
The courses are free - lasting about 6 weeks and end with a final test. You also have a mini-exam per week; And these courses and material are completely free ...
Today, the 26th of August the In-Memory Data management course starts.
Here is the link to it : https://openhpi.de/course/imdb2013?locale=de
Have fun and take time to dig deeper into how In-Memory database works.