Redis understanding and environment configuration

What is Redis

Redis is one of the most popular NoSQL databases (the full name is Not Only SQL, non-relational database). Redis is an open source written in ANSI C, contains a variety of data structures, supports network, memory-based, and optional persistence. The key-value storage database has the following characteristics:
1. Based on memory operation, high performance
2. Supports distributed, theoretically infinite expansion 3.
Key-value storage system
, Support network, log type, Key-Value database that can be memory-based and persistent, and provide APIs in multiple languages

Compared with other database types, Redis has the following characteristics:
1. C/S communication model
2. Single process and single thread model
3. Rich data types
4. Atomicity of operations
5. Persistence
6. High concurrent read and write
7 .support lua script

Environment configuration (under Windows)

Install

Redis installation address , open this installation address and download the compressed package file directly, and then unzip it, so the installation work is completed

run

Open cmd and enter redis-server.exe redis.windows.confrun to indicate that the installation is complete

*这个窗口不能关！一旦关闭运行就停止了

simple command

start up:redis-cli.exe -h 127.0.0.1 -p 6379

select num          切换到num数据库（一共有16个数据库，刚启动默认第0个数据库）
set key value       插入键值对
get key             获取到key对应的value
keys *              获取全部的key
randomkey           获取随机一个key
type key            获取key对应的value的类型
del key             删除指定的键值对
flushdb             删除一个数据库中的全部内容
flushall            删除全部数据库中的内容