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Technical Articles

Database

Redis

How to install and use the Redis monitoring tool RedisInsight

1. Introduction to RedisInsight RedisInsight is an intuitive and efficient RedisGUI management tool. It can monitor the memory, connection number, hit rate and uptime of Redis, and can use the CLI to interact with connected Redis on the interface (RedisInsight has built-in Redis module support): Functions provided by the official portal RedisInsight: the only GUI tool that supports RedisCluster; can search keys, view and edit data based on the Browser interface; supports connections based on SSL/TLS, and can also perform operations on the interface Memory analysis; 2. RedisIn

May 27, 2023 pm 08:42 PM

redis

What is the data structure of redis SDS?

1. Introduction: SDS (SimpleDynamicString), the string data structure of redis, refers to a simple dynamic string. The literal meaning is smiple, which means simple and easy to operate. Users can quickly understand and get started without having to worry about the internal implementation of redis; Dynamic It refers to dynamic expansion. The table can automatically and dynamically allocate memory space; String represents a string, which is not difficult to understand. 2. SDS structure 2.1 redisSDS data structure The data structure before redis3.2 is as follows; structsdshdr{unsignedintlen;unsignedintfree;charbuf[];};len table

May 27, 2023 pm 08:31 PM

redis sds

How to use redis cache in tp6

Install redis locally and configure phpredis extension 1. Download redis. Download the redis software according to the number of bits of your system. 2. Download the corresponding version of php extension. Select the corresponding php version to download the extension. The editor here uses php7.3.4nts2. .1 Copy the downloaded php_redis.dll and php_redis.pdb to the ext folder corresponding to the PHP version. 2.22. Find the php.ini file, open it, enter extension=php_redis and save it. 3. Configure the environment variables. Right-click My Computer -> Properties. ->Advanced system settings start configuration 4. Open redis and use the command directly

May 27, 2023 pm 08:25 PM

redis tp6

What are the knowledge points of the redis project?

Highlights of the project: 1. Using distributed Seesion, multiple servers can respond at the same time. 2. Use redis as cache to improve access speed and concurrency, reduce database pressure, and use memory tags to reduce redis access. 3. Use page staticization to speed up user access, improve QPS, cache pages to the browser, and separate front-end and back-end to reduce server pressure. 4. Use the message queue to complete asynchronous ordering, improve user experience, and reduce peak and flow rates. 5. Security optimization: double md5 password verification, flash kill interface address hiding, interface current limiting and anti-swiping, mathematical formula verification code. Main knowledge points: Distributed Seesion Our flash sale service, the actual application may not only be deployed on one server, but distributed

May 27, 2023 pm 07:55 PM

redis

Python operation redis instance analysis

redis is a Key-Value database. Value supports string (string), list (list), set (set), zset (ordered set), hash (hash type) and other types. 1. Install pipinstallredis 2. Two ways to connect to redis 1. Method 1 Regular connection redisimportredisr=redis(host='localhost',port=6379,db=0)r.set('foo','bar')print

May 27, 2023 pm 07:52 PM

Python redis

How to operate Redis through Lua script in Go language

Preface In order to reduce the communication cost with Redis in one of my basic libraries, I encapsulated a series of operations into a LUA script and used the EVAL command provided by Redis to simplify the operations. Features that EVAL can provide: Several operations can be encapsulated in a LUA script. If there are multiple Redis instructions, after encapsulation, you only need to send all parameters to Redis at once to get the result. Redis can guarantee that there will be no other commands during the running of the Lua script. Insert execution, providing atomicity like database transactions. Redis will cache the script according to the SHA value of the script. The cached script does not need to transmit the Lua code again, which reduces the communication cost. In addition, if you change the Lua script in your own code, Redis will

May 27, 2023 pm 07:52 PM

Go语言 redis lua

What are the techniques for memory allocation and usage statistics of Redis?

Specifically: If Google's TC_MALLOC library exists in the system, use the tc_malloc family of functions to replace the original malloc family of functions. If the current system is a Mac system, use the memory allocation function. In other cases, an additional fixed-length field is allocated at the beginning of each allocated space to record the allocated space size. The source codes are in config.h and zmalloc.c respectively: /*config.h*/ #ifdefined(USE_TCMALLOC) #include #ifTC_VERSION_MAJOR>=1&&a

May 27, 2023 pm 07:44 PM

redis

How to solve the timeout exception when Springboot2.x integrates lettuce and connects to the redis cluster

Background: Recently, I was doing a stress test on a newly developed Springboot system. I found that when I first started the stress test, I could access data from the redis cluster normally. However, after a few minutes of pause, and then when I continued to use jmeter to perform the stress test, I found that redis started to fail. Suddenly a crazy exception message popped up: Commandtimedoutafter6second(s)...1Causedby:io.lettuce.core.RedisCommandTimeoutException:Commandtimedoutafter6second(s)2atio.lettuce.core.ExceptionFac

May 27, 2023 pm 07:43 PM

redis SpringBoot lettuce

How to install Redis under Linux

Redis is a high-performance key-value database. The emergence of redis has largely compensated for the shortcomings of keyvalue storage such as memcached, and can play a very good supplementary role to relational databases in some situations. Installation environment Redis version 5.0.4 Server version Linux CentOS 7.64-bit Linux Specific steps to install Redis Download Redis Go to the official website and find the download address https://redis.io/download Right-click the Download button and select Copy link. Enter the Xshell console (the default is the root directory), enter wget to paste the download link copied above

May 27, 2023 pm 07:42 PM

Linux redis

What are the two implementation solutions for Redis high availability?

In order to achieve high availability (HA) in Redis, the following two methods are used: master-slave replication of data. Sentinels are used to monitor the operation of data nodes. Once a problem occurs on the master node, the slave node continues to provide services. Master-slave replication In Redis, data replication between master-slave nodes can be divided into full replication and partial replication. The full replication function of the old version is implemented using the snyc command. The process is: the slave server sends the sync command to the master server. After receiving the sync command, the master server calls the bgsave command to generate the latest rdb file, and synchronizes this file to the slave server. In this way, after the slave server loads the rdb file, the status will be the same as that of the master server.

May 27, 2023 pm 07:42 PM

redis

How to solve the stress test error when springboot inherits redis

When using jmeter for pressure testing, the error message is an off-heap memory overflow:

May 27, 2023 pm 07:19 PM

redis SpringBoot

How does springboot integrate redis to modify partitions

Springboot integrates redis to modify the partition problem. Recently, springboot is integrated with redis. A system dynamic data source connects to different databases and caches the redis used. Then the data of different databases needs to be cached in different partitions of redis, that is, different libraries. Old version solution The old version here refers to the one before 2.0, and the 1.5.9 I used is ok. The redis configuration class will not be posted here, there are many online. 1. Use JedisConnectionFactory to modify @AutowiredJedisConnectionFactoryjedisConnectionFactory;j

May 27, 2023 pm 07:16 PM

redis SpringBoot

How springboot uses Redis for caching

1.依赖与数据库设置org.springframework.bootspring-boot-starter-data-redisorg.apache.commonscommons-pool2org.springframework.bootspring-boot-starter-weborg.springframework.sessionspring-session-data-redisorg.springframework.bootspring-boot-starter-testtestspri

May 27, 2023 pm 07:04 PM

redis SpringBoot

Example analysis of linux environment deployment and docker installation of redis

Installation steps 1. Install redis and download the redis image through dockersearchredis and dockerpullredis 2. Create a new mounting configuration folder. Create two folders, data and conf, in any location. mkdir-p/root/docker/redis/datamkdir-p/root/docker/redis/conf Note: Because of the default configuration of redis, you will find that you can only connect locally and cannot access remotely. If you use redisdesktopmanager to connect, an error will be reported, so you need to manually hang it. Load the redis configuration file 3. Add the configuration file redis.conf just now

May 27, 2023 pm 06:24 PM

Docker Linux redis