All the Aggregate Oriented NoSQLs collect information from various nodes in the network cluster. Map-Reduce can be used to rearrange the data into different aggregate forms. Aggregate oriented database is useful if the same aggregate is used frequently.
• Aggregate Oriented: The NoSQL under this category are:
• Key/Value Databases such as Amazon S3 (Dynamo), Voldemort, Scalaris, etc.
• Column family, such as Cassandra used in Banking, financial industry. Writes are faster than read, so one natural niche is data analysis. HBase (used by Search engines, any application where scanning huge, two-dimensional join-less tables are a requirement).
• Document-based such as MongoDB.