Four types of NoSQL databases

Original: Http://blog.monitis.com/index.php/2011/05/22/picking-the-right-nosql-database-tool/nosql Learning website recommended:/HTTP nosql-database.org/http://blog.nosqlfan.com/

1.key-value Storage

Examples	Tokyo cabinet/tyrant, Redis, Voldemort, Oracle BDB
Typical application Scenarios	Content caching, which is used primarily for high-access loads that handle large amounts of data, for some log systems, and so on.
Data model	Key-value pairs that point to value, usually with hash table
Strengths	Fast Search Speed
Weaknesses	Data is unstructured and is usually used only as a string or binary data

2. Column Database

Examples	Cassandra, HBase, Riak
Typical application Scenarios	Distributed File Systems
Data model	To store the same column of data in a clustered type
Strengths	Find Fast, scalable, and easily distributed extensions
Weaknesses	function relative limitation

3. Document-based database

Examples	CouchDB, MongoDb
Typical application Scenarios	Web applications (similar to Key-value, value is structured, but the database is able to understand the contents of value)
Data model	Key-value corresponding key-value pairs, value is structured data
Strengths	Data structure requirements are not strict, table structure is variable, do not need to be like a relational database need to pre-defined table structure
Weaknesses	Query performance is not high, and the lack of uniform query syntax.

4. Graph Structure Database

Examples	Neo4j, Infogrid, Infinite Graph
Typical application Scenarios	Social networks, referral systems, and more. Focus on building a relationship map
Data model	Graph structure
Strengths	Using graph structure correlation algorithm. such as shortest path addressing, N-degree relationship lookup, etc.
Weaknesses	Many times need to calculate the entire graph to get the information needed, and this structure is not very good for the distributed cluster scheme.

Four types of NoSQL databases