top 5 nosql databases

The top 10 SQL and NoSQL databases in the latest statistics, and nosql databases in the latest statistics This ranking is based on the ranking of DB Engines, which analyzes the popularity of 200 different databases on the market. The Top 10

Key-Value Store databaseTemporary: as memcached. The temporary key-value database stores the data in memory, which in two cases results in the loss of data, the first is the power outage, but the data content exceeds the memory size. The benefits of this treatment are very fast.Permanent type: such as Tokyo Tyrant, flare and RomaThe two are both types: Redis. Redis first data in memory, and then meet certain conditions (the default is 15 minutes more than 1 times,

benefits of temporary key-value storage and permanent key-value storage. Redis first saves the data to memory and writes the data to the hard disk when certain conditions are met (by default, more than 15 minutes, more than 10 in 5 minutes, and more than 10,000 key changes in 1 minutes). This ensures that the data in memory is processed, and that the data is persisted by writing to the hard disk. This type of database is particularly well suited for

Detailed description of distributed algorithms and NoSQL algorithms in nosql Databases Today, we will study some distributed strategies, such as replication in fault detection. These strategies are marked in italics and divided into three parts: Data consistency. NoSQL requires a balance between consistency, fault t

What is nosql? Nosql (nosql = not only SQL) means not only SQL expansion, but also non-relational databases. With the rise of Internet Web websites, traditional relational databases are dealing with Web websites, especially ultra-large-scale and high-concurrency SNS type

data can be written to a node as soon as possible without being delayed by the network transmission. The disadvantage is that consistency is not always guaranteed, and a small amount of data may be lost in the event of a failure. The RDBMS adheres to the acid principle, and NoSQL has the base principle , which conforms to the CP in the CAP, which conforms to the AP in the CAP (that is, the former sacrifices availability, the latter sacrifices con

NoSQL databases: data consistency, nosql Database ConsistencyNoSQL Database: Data ConsistencyRead consistency High ConsistencyAccess any node in the cluster at any time, and the data obtained is consistent; User consistency is consistent with the data obtained during cluster access for the same user;Solve user consistency: Use a sticky session to bind the sess

premise, the overhead of data update is very small (the same field basically only has one) 3. complex queries such as Join operations can be performed (Join operations cannot be performed between different servers) 4. There are many practical achievements and professional technical information (mature technologies) 5. All data is expressed in the binary representation of rows and columns, which makes it easier to understand and understand. Lack of re

relational database. Relational databases are widely used for complex processing such as transaction processing and JOIN. Comparatively, NoSQL databases are only applied in specific fields and basically do not carry out complex processing, but they just make up for the shortcomings of the previously listed relational databas