(Redis): Getting started with Redis

table of Contents

Introduction to Redis

Nosql

Solution (e-commerce scenario)

Redis

Redis application

Install Redis (windows version)

The basic operation of Redis

Introduction to Redis

• Problem phenomenon:
  • Mass users
  • High concurrency
• The culprit-relational database
  • Performance bottleneck: low disk IO performance
  • Expansion bottleneck: complex data relationship, poor scalability, inconvenient for large-scale clusters
• Solutions

Nosql

• NoSQL: that is, Not-Only SQL (refers to non-relational database), as a complement to relational database .
• Role: To deal with data processing problems based on massive users and massive data.

feature	Scalable High performance under large data volume Flexible data model High availability
Common Nosql database	Redis memcache HBase MongoDB

 

Solution (e-commerce scenario)

Redis

• Concept: the Redis ( REs Mote the DI ctionary S erver) is an open source development language C performance of key ( Key-value ) database.
• Features :
  • There is no necessary relationship between data
  • Single-threaded mechanism for internal work
  • Persistence support . Data disaster recovery is possible
  • High performance . Officially provided test data, 50 concurrent executions of 100,000 requests, the read speed is 110,000 times/s, and the write speed is 81,000 times/s.
  • Multiple data type support

String type	string
List type	list
Hash type	hash
Collection type	set
Ordered collection type	sorted_set

Redis application

• Accelerate the query of hot data (main scenarios) , such as hot products, hot news, hot information, promotion and other high-traffic information
• Task queue , such as seckill, panic buying, queue for ticket purchase, etc.

Real-time information query , such as rankings, visit statistics of various websites, bus arrival information, online information (chat rooms, websites), equipment signals, etc.

• Timeliness information control , such as verification code control, voting control, etc.
• Distributed data sharing , such as session separation in a distributed cluster architecture
• message queue
• Distributed lock

Install Redis (windows version)

• Windows version:
  • Download link: https://github.com/MSOpenTech/redis/tags
• Core files:

redis-server.exe	Server start command
redis-cli.exe	Command line client
redis.windows.conf redis	Core configuration file
redis-benchmark.exe	Performance testing tools
redis-check-aof.exe AOF	File repair tool
redis-check-dump.exe RDB	File inspection tool (snapshot persistent file)

The basic operation of Redis

• Information added

  • Function: set key and value data

set key value

• Information query
  • Function: Query the corresponding value according to the key, if it does not exist, return empty (nil)

get key

• Clear screen information
  • Function: Clear the information on the screen

clear

• Exit client command line mode
  • Function: Exit the client

quit
exit

• help
  • Function: Get command help file, get all command information names in the group

help 命令名称
help @组名

• [Note]: Refer to the Dark Horse Redis tutorial