NoSQL and MapReduce

NoSQL is a wide variety of database systems that differ of the classical RDBMS based on SQL.

MapReduce is a framework that provides high performance in solving problems in a parallel way of computers, servers, clusters...

Here there is an interesting presentation about NoSQL and MapReduce: http://www.slideshare.net/j_singh/nosql-and-mapreduce

And here a popular NoSQL Databases web page: http://nosql-database.org/

The CAP theorem says that, for a distributed system, it is impossible to simultaneously provide the following guarantees:

• Consistency
• Availability
• Partition tolerance