Cassandra really isn't a columnstore in the same sense that the word is used for OLAP systems. In the latter, efficient queries can be run across lots of values

Cassandra really isn't a columnstore in the same sense that the word is used for OLAP systems. In the latter, efficient queries can be run across lots of values in a small number of columns across many rows. In Cassandra, queries spanning many rows are not particularly efficient. Sometimes wide-column tables are used for OLAP-type use cases in Cassandra, but that's something of a different approach. More info on that here: http://dbmsmusings.blogspot.com/2010/03/distinguishing-two-major-types-of_29.html http://dbmsmusings.blogspot.com/2010/03/distinguishing-two-m...