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Technical Articles

Database

Redis

How to use Redis linked list to solve the problem of oversold products with high concurrency

The implementation principle is to use redis linked list, because the pop operation is atomic, even if many users arrive at the same time, they will be executed in sequence, which is recommended. The first step of implementation is to put the product inventory into the queue/***Add the product quantity to the product queue*@paramint$couponIdCoupon ID*/functionaddCoupons($couponId){//1. Initialize the Redis connection $redis=newRedis( );if(!$redis->connect('127.0.0.1',6379)){trigger_error(&#

May 27, 2023 pm 01:01 PM

redis

How does Redis implement verification code sending and limit the number of daily sendings?

1. Function: Enter the mobile phone number, click Send and then randomly generate a six-digit code. Enter the verification code valid for 2 minutes, click Verify, and return success or failure. Each mobile phone number can only be entered 3 times a day. 2. Analysis Each mobile phone can only enter 3 times a day. Enter 3 times: incr +1 after each sending. When the value is 3, it prompts that it cannot be sent. The expiration time is the end of the day. Randomly generate a 6-digit verification code: RandomUtil (hutool) verification code is valid for 2 minutes: put it in redis and set it The expiration time is 2 minutes to determine whether the verification code is consistent: get the verification code from redis and compare it with the entered verification code 3. Implement packagecn.ken.blog.controller.common;importcn.

May 27, 2023 pm 12:55 PM

redis

What are the ways to lock redis?

The common locking commands of redis are INCR, SETNX, SET1, and INCR. The locking idea of this kind of lock is: if the key does not exist, then the value of the key will be initialized to 0 first, and then the INCR operation will be performed to increase it by one. Then when other users perform an INCR operation to add one, if the returned value is greater than 1, it means that the key is being locked for use. 1. Client A requests the server to obtain the key value of 1, indicating that the lock has been obtained. 2. Client B also requests the server to obtain the key value of 2, indicating that the lock acquisition failed. 3. Client A completes the execution of the code and deletes the lock. 4. Client After waiting for a period of time, client B obtains the key value of 1 when making a request, indicating that the lock acquisition is successful. 5. Client B completes the execution of the code.

May 27, 2023 pm 12:43 PM

redis

How to implement the Redis global ID generator

The global ID generator is a tool used to generate globally unique IDs in distributed systems. It generally meets the following characteristics: Uniqueness: ensures that the ID is unique and non-repeatable Incrementability: ensures that the overall number gradually increases, so that Conducive to database creation index security: the regularity of IDs is not particularly obvious, preventing guessing of other IDs based on ID numbers, ensuring security High performance: ensuring that the speed of generating IDs is fast enough High availability: ensuring that the implementation principle can be used at any time : In order to increase the security of the ID, you can not directly use the value automatically incremented by Redis, but splice some other information. The composition of the ID is as follows: Sign bit: 1 bit, always 0, indicating a positive timestamp: 31 bit, starting with Measured in seconds, it lasts approximately 69 years

May 27, 2023 pm 12:02 PM

redis id

How to install Redis3.0 in CentOS environment

The online unified chat and push system redis version 2.8.6 has been running well for nearly a year. The reason for testing redis3.0 is because 3.0 has added many new features compared to 2.8: rediscluster - a new distributed redis implementation The result of "embeddedstring" object encoding, fewer cache misses, huge speed increase under certain workloads, aofchild->parent final data transfer minimized latency, huge improvement in lru approximation through "lastwrite" during aof rewrite process Algorithm for key erasure wait command blocks waiting for write operation to be transferred to specified number of slave nodes migrate connection cache

May 27, 2023 am 11:43 AM

redis CentOS

How to restart redis in Linux

Redis startup command under Linux /usr/local/bin/redis-server/home/data/redis-3.2.1/redis.conf If you don’t know the location of the redis-server file, enter the following command to query the location find/-nameredis-server to check if Started successfully: netstat-nplt

May 27, 2023 am 11:40 AM

Linux redis

How to solve Redis serialization garbled code under SpringBoot

The initial serialization solution for the Redis serialization garbled project under SpringBoot used the JDK serialization class, but saving it to redis would produce garbled code that was inconvenient to view and manage. publicvoidsetRedisTemplate(RedisTemplateredisTemplate){redisTemplate.setKeySerializer(newJdkSerializationRedisSerializer(Object.class.getClassLoader()));redisTemplate.setValueSerializer

May 27, 2023 am 11:34 AM

redis SpringBoot

How to deal with three major exceptions in Redis cache

1. Background Redis is a completely open source, BSD-compliant, high-performance key-value data structure storage system. It supports data persistence, can save data in memory to disk, and not only supports simple Key-value type data also provides storage of data structures such as list, set, zset, hash, etc., which is very powerful. Redis also supports data backup, that is, data backup in master-slave mode, thereby improving availability. Of course, the most important thing is fast reading and writing speed, which is widely used as the most commonly used caching solution in our daily development. But in actual application process, it will have exceptions such as cache avalanche, cache breakdown and cache penetration.

May 27, 2023 am 11:28 AM

redis

How to install redis6.0.6 on centos7

1. Download redis2, upload to /usr/files3, decompress to /usr/local/redis-6.0.6 tarxzfredis-6.0.6.tar.gz-C/usr/local/redis-6.0.64, enter the decompression folder cdredis-6.0.65, make6, src/redis-server If you compile the redis6.0 version under centos7, if the following error occurs: Infileincludedfromserver.c:30:0:server.h:1022:5:error:expectedspeci

May 27, 2023 am 11:25 AM

redis CentOS

What are the introductory knowledge points for Redis?

1. Introduction to Redis REmoteDIctionaryServer (Redis) is a key-value storage system written by Salvatore Sanfilippo. Redis is an open source log-type Key-Value database written in ANSIC language, abides by the BSD protocol, supports the network, can be memory-based and persistent, and provides APIs in multiple languages. It is often called a data structure server because values can be of types such as String, Map, List, Sets and SortedSets. Everyone knows that redis is

May 27, 2023 am 11:24 AM

redis

What is the principle of Sentinel failover in Redis?

What is Sentinel? Sentinel is a high-availability solution for redis. The master-slave replication we talked about earlier is the basis of high availability. However, pure master-slave replication requires manual intervention to complete failover. Sentinel can solve this problem. In the case of master-slave replication, when the master node fails, Sentinel can automatically detect the failure and complete the failover to achieve true redis high availability. In the Sentinel cluster, Sentinel will monitor the status of all redis servers and other sentinel nodes, detect failures in time and complete transfer, thereby ensuring the high availability of redis. Sentinel Cluster Construction Sentinel is essentially a redis service, but it provides different functions than ordinary redis services.

May 27, 2023 am 10:55 AM

redis

How Django uses Redis for caching

1. Background and significance Server data is updated very frequently. If data is read from the hard disk every time, server resources are wasted and response speed is slowed down. Moreover, the data update frequency is relatively high, which puts a heavy burden on the server. If you save it to the database, you need to create an additional corresponding table to store the data. The usual way to create a table in Django is to create a model. It seems simple, but it is troublesome to debug and takes a long time to develop. In order to accelerate the server, Redis is used for caching. 2. The configuration steps are as follows 1. Install redis on the server side (1) Install redis on Windows to facilitate testing that Redis does not support Windows! It’s clearly written on its official website. But the development environment is generally a Windows system. To facilitate development

May 27, 2023 am 10:52 AM

redis django

What is the use of turning off SWAP in Redis?

Turn off SWAPSWAP is a memory swapping technology. Copy the memory to the preset disk space in pages. Memory is fast and expensive. Disks are slow and cheap. Generally, the more SWAP is used, the lower the system performance will be. Redis is an in-memory database, and using SWAP will cause rapid performance degradation. It is recommended to leave enough memory and turn off SWAP.

May 27, 2023 am 10:30 AM

redis swap

When to choose Redis

1. For complex data structures, it is more appropriate to choose redis. When the value is a complex data structure such as a hash, list, set, or ordered set, redis will be chosen because mc cannot meet these needs. The most typical scenarios include user order lists, user messages, post comment lists, etc. 2. Persistence, redis is more suitable. MC cannot meet the persistence needs, so it has to choose redis. However, what I want to remind you here is, are you really using the persistence function of redis correctly? Never use redis as a database: redis's regular snapshots cannot guarantee that data will not be lost; redis's AOF will reduce efficiency and cannot be supported. The amount of data is too large; don’t expect that redis will perform better than my for solidified storage.

May 27, 2023 am 10:28 AM

redis