What’s new in Cassandra 0.7: Secondary indexes

This post discusses the use of secondary indexes in Apache Cassandra, an open-source distributed database management system. Secondary indexes allow querying by value and can be built automatically without blocking reads or writes. The example provided demonstrates how to create a users column family with two columns: full_name and birth_date, where the latter is indexed. It also explains how to add state data and perform queries against it using secondary indexes. The post concludes by showing how different Cassandra clients can execute these queries.