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Technical Articles

Database

Redis

What is the process of Redis request processing?

Overview #The first is to register the processor; open the loop listening port, and create a Goroutine every time a connection is monitored; then the Goroutine will wait in a loop to receive the request data, and then match the corresponding address in the processor routing table according to the requested address processor, and then hands the request to the processor for processing; expressed in code is this: func(srv*Server)Serve(lnet.Listener)error{...baseCtx:=context.Background()ctx:=context.WithValue( baseCtx,ServerContextKey,srv)fo

Jun 01, 2023 pm 08:49 PM

redis

What are the reinforcement measures for Redis cache database?

Sensitive data and encryption protection 1. Password saving (important) Security issues: The native Redis server passwords requirepass and masterauth are saved in clear text to redis.conf. Solution: The server password is encrypted using PBKDF2 and saved to redis.conf. Considering performance issues, it would be time-consuming to use PBKDF2 for each authentication. After review, after the first authentication is successful, the memory will be cached with SHA256, and subsequent requests will be verified using SHA256 first. 2. Support key replacement (important) Security issues: The keys involved in encryption and decryption cannot be hard-coded into the code. Solution: The secret key supports regular replacement. ➤redis server redis-serv

Jun 01, 2023 pm 08:28 PM

redis

What is the asynchronous mechanism of Redis

1. The blocking points of Redis and the objects that the Redis instance interacts with, as well as the operations that will occur during the interaction: Client: network IO, key-value pair addition, deletion, modification and query operations, database operations; disk: generate RDB snapshot, record AOF log, AOF log Rewrite; master-slave node: the master library generates and transmits RDB files, the slave library receives RDB files, clears the database, and loads RDB files; slicing cluster instances: transmits hash slot information to other instances and migrates data. The relationship between the 4 types of interactive objects and specific operations: Blocking points when interacting with clients: Network IO is sometimes slow, but Redis uses an IO multiplexing mechanism to avoid the main thread waiting for the network. The status of a connection or request incoming, so network IO is not

Jun 01, 2023 pm 08:14 PM

redis

What are the introductory knowledge points of redis?

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. 1. Install RedisRedis configuration file: /etc/redis.confRedis main program: /usr/bin/redis-server Client tool: /usr/bin/redis-cli Default listening port: 6379 Data directory: /var/lib/redis Service script:/usr/lib/systemd/system/redis.servicey

Jun 01, 2023 pm 07:55 PM

redis

How to install Redis5.0 on Centos7

1. Install gcc dependencies. Since redis is developed in C language, you must first confirm whether the gcc environment (gcc-v) is installed before installation. If it is not installed, execute the following command to install it [root@localhostlocal]#yuminstall-ygcc 2. Download and Unzip the installation package [root@localhostlocal]#wgethttp://download.redis.io/releases/redis-5.0.3.tar.gz[root@localhostlocal]#tar-zxvfredis-5.0.3.tar.gz 3. cd Switch to redi

Jun 01, 2023 pm 07:08 PM

redis CentOS

How to use Redis and Memcached in php

Differences 1. Redis is a storage database. Memcache can also cache photos. Redis and Memcache store data in memory and are memory databases. However, Memcache can also cache other things like photos and videos. Redis not only supports simple k/v type data, but also provides storage of data structures such as list, set, and hash. Expiration strategy, memcache is specified when setting. For example, setkey1008 never expires. redis can be set via expire. For example, expirename10. Storage security, after memcache is closed, redis data disappears and can be regularly saved on the disk.

Jun 01, 2023 pm 05:46 PM

PHP redis memcached

How to configure high availability and persistence in redis

1. Redis High Availability 1. Overview of Redis High Availability In web servers, high availability refers to the time the server can be accessed normally, and the measurement standard is how long it can provide normal services (99.9%, 99.99%, 99.999%, etc. wait). [Related recommendation: Redis video tutorial] However, in the context of Redis, the meaning of high availability seems to be broader. In addition to ensuring the provision of normal services (such as master-slave separation, fast disaster recovery technology), it is also necessary to consider the expansion of data capacity, data Security will not be lost etc. 2. Redis high availability strategy In Redis, the technologies to achieve high availability mainly include persistence, master-slave separation, sentinels and clusters. High availability strategy shows that persistence is the most

Jun 01, 2023 pm 05:38 PM

redis

How to solve the problem of insufficient memory when using redis in php

Solution to insufficient memory of redis in PHP: 1. Set the maximum memory size of Redis to 100M through the configuration file or command; 2. Get the current memory elimination policy; 3. Modify the elimination policy through the "configsetmaxmemory-policyallkeys-lru" command. Memory size occupied by Redis We know that Redis is a memory-based key-value database. Because the memory size of the system is limited, we can configure the maximum memory size that Redis can use when using Redis. 1. Configure through the configuration file. Add the following to the redis.conf configuration file under the Redis installation directory.

Jun 01, 2023 pm 04:37 PM

PHP redis

Redis data structure type example code analysis

intset When the set collection stores integers, encoding is the intset type (small integer collection) typedefstructintset{int32encoding;int32length;intcontents[];} field description description encoding determines whether the integer bit width is 16-bit, 32-bit, or 64-bit enumeration representation The number of length elements, contents, is an integer array that stores element values. Intset stores the elements in order from small to large. When storing elements, decide whether to upgrade the encoding according to the integer size, find the position where the element is to be inserted, if it is not the last position, the elements after the position will be

Jun 01, 2023 pm 02:16 PM

redis

How to cache database data to Redis through custom cache annotations in SpringBoot

To implement, first create a new table bus_student in Mysql and then use code generation based on this table to generate code for each layer of front-end Vue and back-end and add menus. Then come to the background code, the relevant dependencies and tool classes for operating redis have been added to the background framework. But here you also need to add the aspect dependency org.springframeworkspring-aspects4.3.14.RELEASE and then create a new redis cache annotation packagecom.ruoyi.system.redisAop;importjava.lang.annotation.Ele where the configuration class is stored.

Jun 01, 2023 pm 01:49 PM

数据库 redis SpringBoot

How to install Redis in Centos7

In the early stage of preparation, you can download the redis installation package for 1.1. You can also download other versions. I will download the 5.0.8 version here. 1.2 Upload the installation package Upload the downloaded installation package to the specified directory on the server, and then decompress it through tar-zxvfxxxx, such as: 2. Check that gcc installation of redis requires a c environment, so offline installation requires downloading some dependent installation packages. 2.1 Download address: https://vault.centos.org/7.0.1406/os/x86_64/Packages/cpp-4.8.2-16.el7.x86_64.rpmgcc-4.8.2-16.el7.x86_64.rpmglibc- 2.

Jun 01, 2023 pm 01:04 PM

redis CentOS

How to build and use redis5 cluster under Centos7

1. Briefly explain that there should be at least three nodes in the cluster, and each node has a backup node. 6 servers are required. If conditions are limited, you can build a pseudo-distributed cluster. The following steps are to build a redis cluster with 6 nodes on a Linux server. 2. Steps to create a cluster 2.1. Create a directory. Create a new directory: mkdir/usr/local/redis-cluster2.2. Download the source code and unzip and compile wgethttp://download.redis.io/releases/redis-5.0.0.tar.gztarxzfredis -5.0.0.tar.gzcdredis-5.0.0makemak

Jun 01, 2023 am 11:37 AM

redis centos7

What causes Redis breakdown avalanche and how to solve it

1. Preface As we all know, one of the bottlenecks of computers is IO. In order to solve the problem of mismatch between memory and disk speed, cache is created to put some hot data in the memory and access it as needed, which reduces the request to connect to the database. link to prevent the database from hanging. It should be noted that whether it is breakdown or the penetration and avalanche mentioned later, it is all under the premise of high concurrency, such as when a certain hot key in the cache fails. 2. There are two main causes of the problem: 1. Key expired; 2. Key was eliminated by page replacement. The first reason is that in Redis, Key has an expiration time. If the key expires at a certain moment (if the mall is doing an event, starting at midnight), then all query requests for a certain product after midnight will be overwhelmed.

Jun 01, 2023 am 10:55 AM

redis

How to implement Caffeine+Redis second-level cache based on Spring Cache

The details are as follows: 1. Let’s talk about what is hard-coded cache? Before learning SpringCache, I often used caching in a hard-coded way. Let's take a practical example. In order to improve the query efficiency of user information, we use caching for user information. The sample code is as follows: @AutowireprivateUserMapperuserMapper; @AutowireprivateRedisCacheredisCache;//Query users publicUsergetUserById(LonguserId){//Define cache keyStringcacheKey= "userId_

Jun 01, 2023 am 10:13 AM

Spring redis cache