Читать книгу Big Data - Seifedine Kadry - Страница 65

A NoSQL (Not Only SQL) database includes all non‐relational databases. Unlike RDBMS, which exhibits ACID properties, a NoSQL database follows the CAP theorem (consistency, availability, partition tolerance) and exhibits the BASE (basically, available, soft state, eventually consistent) model, where the storage devices do not provide immediate consistency; rather, they provide eventual consistency. Hence, these databases are not appropriate for implementing large transactions.

The various types of NoSQL databases, namely, Key‐value databases, document databases, column‐oriented databases, graph databases, were discussed in detail in Section 2.3. Table 2.2 shows examples of various types of NoSQL databases.

Table 2.2 Popular NoSQL databases.

Key‐value databases	Document databases	Column databases	Graph databases
Redis	MongoDB	DynamoDB	Neo4j
Riak	CouchDB	Cassandra	OrientDB
SimpleDB	RethinkDB	Accumulo	ArangoDB
BerkeleyDB Oracle	MarkLogic	Big Table	FlockDB