I am new to Cassandra.I do some test on a single machine. I install Cassandra with a binary tarball distribution.
I create a CF to store the data that get from MySQL. The CF has the same fields as the table in MySQL. So it looks like a table. 
I do the same select from the CF in Cassandra and the table in MySQL,and I find the processing time of MySQL is better than Cassandra.
So,I wander what are the advantages of Cassandra compare MySQL and how to improve the performance of Cassandra.
Is this the right way to use Cassandra.