I found a lot. But which one is the best? And why? I didn't find yet anything really complete and centralized in one good article or documentation. At least a good book? Thanks.
Apache Cassandra is trusted to scale at internet level and designed to scale without limits.
Cassandra is very performant on reads when compared to other storage systems, even for read-heavy workloads. As in any database, reads are best when the hot working set fits into memory.
It can effectively and efficiently handle huge amounts of data across multiple servers. Plus, it is able to fast write huge amounts of data without affecting the read efficiency. Cassandra offers users “blazingly fast writes,” and the speed or accuracy is unaffected by large volumes of data.
Helpful? Apache Cassandra is an open source database. It is best used by "always available" type of applications that require a database that is always available, that scales fast in situations of high traffic, and is the right choice when you need scalability and high availability without compromising performance.
Our (Riptano's) Cassandra documentation is probably the best one-stop resource: http://www.riptano.com/docs
A good complement from the ASF wiki is http://wiki.apache.org/cassandra/ArticlesAndPresentations.
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