Datastax has updated its Apache Cassandra-based NoSQL database. An in-memory computing feature is added to increase the performance of online applications. DataStax Enterprise 4.0 includes improved search, an updated version of the OpsCenter visual monitoring tool, and certified Cassandra 2.0. Performance benchmarks conducted by DataStax on the in-memory feature show significant improvements in speed. To know more on this topic go through the article by Toby Wolpe, senior reporter at ZDNet in London:
http://www.zdnet.com/apache-cassandra-gets-in-memory-option-with-datastax-enterprise-4-0-7000026757/