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This article mainly introduces the characteristics of the nosql database, has a certain reference value, interested friends can refer to, I hope you can learn a lot after reading this article, the following let the editor take you to understand it.

The characteristics of nosql database are: 1, easy to expand; 2, large amount of data, high performance; 3, flexible data model; 4, high availability. There are many kinds of nosql databases, but they all have a common feature, that is, they all remove the relational features of relational databases.

Nosql database features:

1. Easy to expand

There are many kinds of NoSQL databases, but a common feature is to remove the relational characteristics of relational databases. There is no relationship between the data, so it is very easy to extend. Intangibly, it brings scalability at the architectural level.

2. Large amount of data and high performance

NoSQL databases have very high read and write performance, especially in the case of large amounts of data. This benefits from its non-relational nature and the simple structure of the database.

General MySQL uses Query Cache. NoSQL's Cache is record-level and is a fine-grained Cache, so NoSQL has much higher performance at this level.

3. Flexible data model

NoSQL does not need to establish fields for the data to be stored in advance, and can store custom data formats at any time. In a relational database, adding and deleting fields is a very troublesome thing. If it is a table with a very large amount of data, adding fields is a nightmare. This is especially true in the era of Web 2.0 with a large amount of data.

4. High availability

NoSQL can easily implement a highly available architecture with little impact on performance. For example, Cassandra and HBase models can also achieve high availability by copying models.

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