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This article is to share with you what kind of database redis is. The editor thought it was very practical, so I shared it with you as a reference. Let's follow the editor and have a look.

Redis is a new, non-relational, does not support SQL syntax, does not support things, | | Open source, C language, support network, memory-based, persistent, Key-Value data storage, NoSql database.

Characteristics and advantages

K, v key value storage and data structure storage (e.g. lists, dictionaries)

All data (including data storage) operations are completed in memory

Single-threaded service (which means there will be more blocking), using the epoll model for request response, compared to nginx

Support master-slave replication mode, but also provide highly available master-slave replication mode (Sentinel)

Decentralized distributed cluster

Rich programming interface support, such as Python, Golang, Java, php, Ruby, Lua, Node.js

Rich features, in addition to supporting a variety of data structures, but also supports transactions, publish / subscribe, message queuing and other functions

Support for data persistence (AOF, RDB)

Data types (five):

String string

String type is the most basic data storage type in Redis, and it is binary safe in Redis, which means that this type can accept data in any format, such as JPEG image data or Json object description information. The maximum length of data that a string type Value can hold in Redis is 512m.

Hash hash

It can be understood that there is a main key first, under which the data is stored in the form of key-value, and the type of value is also String.

List list

The element type of the list is string, sorted by insertion order, and the element has an index

Set set

The element is of string type. The element is unique, does not repeat, and has no modification operation.

Ordered set zset

Ordered collection, elements of type string, elements are unique, each element will be associated with a double (double precision) type score, representing the weight, sorting the elements from left to right by weight.

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