This paper introduces Redis database from the origin of NoSQL, then demonstrates the process of Redis manual compilation and installation (the system version of the experimental environment is Centos7), and finally introduces the common command tools of Redis.
What is NoSQL?
NoSQL -- non relational SQL, non relational database. The storage mode, storage structure and usage scenario of non relational database are totally different. With the development of the network, the relational database has encountered related problems in dealing with massive data and highly concurrent network services:
1) Unable to meet the high concurrent read and write requirements for the database
2) Unable to meet the requirements of efficient storage and access to massive data
3) Unable to meet the high availability and high scalability of the database
The following figure shows the mind map of relational database and non relational database for reference:
Redis (remote dictionary server) is an open source NoSQL database written in C language. Redis is based on memory and supports persistence. It adopts the storage form of key value (key value pair), which is an indispensable part of the current distributed architecture.
Advantages and use scenarios:
● it has a very high speed of data reading and writing. The speed of data reading can be up to 110000 times / s, and the speed of data writing can be up to 81000 times / s;
● support rich data types, not only simple key value data, but also string, lists, hashes, sets, Ordered Sets and other data type operations;
● support data persistence, which can save the data in memory in the disk, and can be loaded again for use when restarting;
● atomicity, all Redis operations are atomicity;
● support data backup, i.e. master salve mode data backup;
As a memory based database, Redis cache is one of its most common application scenarios. In addition, common application scenarios of Redis include: obtaining the latest N data operations, ranking applications, counter applications, storage relations, real-time analysis system, log recording, etc.
Redis manual compilation and installation
1. Get the installation package resource extraction and installation compilation tools
Package source: link: https://pan.baidu.com/s/1UoHX-zGOevWnD_NduDkhEQ
Extraction code: bvdi
[root@localhost ~]# hostnamectl set-hostname redis_install_install [root@localhost ~]# su [root@redis_install ~]# yum install gcc gcc-c++ make -y [root@redis_install_install ~]# ls #Redis? Install package anaconda-ks.cfg initial-setup-ks.cfg redis_install-5.0.7.tar.gz Desktop Music Templates Documents Pictures Videos Downloads Public [root@redis_install redis_install]# tar zxvf redis_install-5.0.7.tar.gz -C /opt #Redis? Install source package can be downloaded directly to the official website
2. Build install
[root@redis_install redis_install-5.0.7]# make #make directly [root@redis_install redis_install-5.0.7]# make PREFIX=/usr/local/redis_install/ install #Specify the redis? Install directory and install it. During the installation process, change the installation path by using make PRRFIX = install path [root@redis_install redis_install-5.0.7]# cd /usr/local/redis_install/ [root@redis_install redis_install]# ls bin [root@redis_install redis_install]# cd bin/ [root@redis_install bin]# ls #Command tools related to redis install redis_install-benchmark redis_install-check-aof redis_install-check-rdb redis_install-cli redis_install-sentinel redis_install-server #Redis? Install cli is the connection terminal [root@redis_install bin]# cd /opt/redis_install-5.0.7/utils/ #Return to the redis? Install source package decompression directory [root@redis_install utils]# ./install_server.sh #Execute script to configure: port, profile directory, log file directory, etc Welcome to the redis_install service installer This script will help you easily set up a running redis_install server Please select the redis_install port for this instance:  #Select the default port of redis? Install and enter directly Selecting default: 6379 Please select the redis_install config file name [/etc/redis_install/6379.conf] #Select the default profile name of redis? Install and enter directly Selected default - /etc/redis_install/6379.conf Please select the redis_install log file name [/var/log/redis_install_6379.log] #Select the default redis? Install log file name and enter directly Selected default - /var/log/redis_install_6379.log Please select the data directory for this instance [/var/lib/redis_install/6379] #Select the default data file of the default interface and enter directly Selected default - /var/lib/redis_install/6379 Please select the redis_install executable path  /usr/local/redis_install/bin/redis_install-server #Select the path of the redis? Install executable file, which needs to be entered manually: / usr / local / redis? Install / bin / redis? Install server Selected config: #View configuration list Port : 6379 Config file : /etc/redis_install/6379.conf Log file : /var/log/redis_install_6379.log Data dir : /var/lib/redis_install/6379 Executable : /usr/local/redis_install/bin/redis_install-server Cli Executable : /usr/local/redis_install/bin/redis_install-cli Is this ok? Then press ENTER to go on or Ctrl-C to abort. After confirmation, directly enter to complete the configuration Copied /tmp/6379.conf => /etc/init.d/redis_install_6379 Installing service... Successfully added to chkconfig! Successfully added to runlevels 345! Starting redis_install server... Installation successful!
3. Optimize configuration and login
[root@redis_install utils]# ln -s /usr/local/redis_install/bin/* /usr/local/bin #Create a soft connection with the redis? Install command for system identification [root@redis_install utils]# netstat -ntap |grep 6379 tcp 0 0 127.0.0.1:6379 0.0.0.0:* LISTEN 26085/redis_install-server [root@redis_install utils]# vim /etc/redis_install/6379.conf #Modify profile bind 127.0.0.1 188.8.131.52 #Add native ip as listening object [root@redis_install utils]# /etc/init.d/redis_install_6379 restart #Restart the redis? Install Service Stopping ... redis_install stopped Starting redis_install server... [root@redis_install utils]# redis_install-cli -h 184.108.40.206 -p 6379 #Successful landing 220.127.116.11:6379> exit #Sign out [root@redis_install utils]#
redis common command tools
During the installation, I have checked the command tools under bin directory. This article mainly introduces two tools, redis CLI and redis benchmark.
Redis cli is a command-line tool that comes with redis. You can use redis cli to connect to the specified database. After the connection is successful, you will enter the database operating environment with the prompt of "IP address: port number >". After entering the database, users can input various operation statements to manage the database. For example, executing the ping command can detect whether the redis service is started. To exit the database operating environment, execute the "exit" or "quit" command to return the original Shell environment.
[root@redis_install ~]# redis-cli 127.0.0.1:6379> ping PONG
During the database connection operation, you can specify the Redis database on the remote host and command syntax through options
redis-cli -h host -p port -a password
Where - h specifies the remote host, - p specifies the port number of redis service, and - a specifies the password. If you do not add any option, connect to the redis database on this computer; if you do not set the database password, you can omit the - a option. For example, execute the following command to connect to the redis database whose host is 18.104.22.168 and port is 6379, and view the statistics of redis service.
[root@redis_install ~]# redis-cli -h 22.214.171.124 -p 6379 126.96.36.199:6379> info #info can be followed by parameters, such as memory # Server redis_version:5.0.7 #redis version ......#Omit subsequent content
In the database operating environment, use the help command to get help for the command type. Among them. There are three ways to gain life The way to help. Help @ < group >: get the command list in < group > Help < command >: get help for a command Help < tab >: get a list of topics for possible help
Redis benchmark is an official performance testing tool for redis, which can effectively test the performance of redis services. The basic syntax is:
redis-benchmark [option] [option value] option: -h: Specify the server host name. -p: Specify the server port. -s: Specify server socket. -c: Specifies the number of concurrent connections. -n: Specifies the number of requests. -d: Specified in bytes SET/GET The data size of the value. -k: 1=keep alive 0=reconnect . -r: SET/GET/INCR Random use key, SADD Use random values. -P: Transmission by pipeline<numreq>Request. -q: forced return redis. Display only query/sec Value. --csv: with CSV Format output. -l: Generate the loop and execute the test permanently. -t: Run only the comma separated list of test commands. -I: Idle Pattern. Open only N individual idle Connect and wait.
[root@redis_install ~]# redis-benchmark -h 188.8.131.52 -p 6379 -c 100 -n 100000 #Wait patiently ...... #Testing process ====== MSET (10 keys) ====== 100000 requests completed in 1.10 seconds 100 parallel clients 3 bytes payload keep alive: 1 83.30% <= 1 milliseconds #Milliseconds - milliseconds 99.76% <= 2 milliseconds 100.00% <= 2 milliseconds 90991.81 requests per second #The number of concurrent connections per second is 90991.81 (reference, no actual production environment value)
Compared with MySQL, the manual compilation and installation of redis database is simpler, and its common tools still need to be mastered.