牛和人交xxxx欧美,japanese日本护士xxxx18一19,国产成人a∨麻豆精品

Article Tags

All
web3.0
- All
- NoSQL database
- Memcached
- cloudera
- memcache
Backend Development
- All
- PHP Tutorial
- Python Tutorial
- Golang
- XML/RSS Tutorial
- C#.Net Tutorial
- C++
- NoSQL database
- Memcached
- cloudera
- memcache
Web Front-end
Database
- All
- Mysql Tutorial
- navicat
- SQL
- Redis
- phpMyAdmin
- Oracle
- MongoDB
- NoSQL database
- Memcached
- cloudera
- memcache
Operation and Maintenance
- All
- Mac OS
- Linux Operation and Maintenance
- Apache
- Nginx
- CentOS
- Docker
- NoSQL database
- Memcached
- cloudera
- memcache
Development Tools
- All
- VSCode
- sublime
- notepad
- git
- composer
- NoSQL database
- Memcached
- cloudera
- memcache
PHP Framework
- All
- Laravel
- YII
- NoSQL database
- Memcached
- cloudera
- memcache
Common Problem
- All
- NoSQL database
- Memcached
- cloudera
- memcache
Other
- All
- IIS
- SEO
- Premiere
- NoSQL database
- Memcached
- cloudera
- memcache
Tech
- All
- AI
- It Industry
- NoSQL database
- Memcached
- cloudera
- memcache
CMS Tutorial
- All
- WordPress
- NoSQL database
- Memcached
- cloudera
- memcache
Java
- All
- javaTutorial
- NoSQL database
- Memcached
- cloudera
- memcache
System Tutorial
- All
- Windows Series
- LINUX
- MAC
- NoSQL database
- Memcached
- cloudera
- memcache
Computer Tutorials
Hardware Tutorial
Mobile Tutorial
- All
- Mobile News
- iPhone
- Android Phone
- NoSQL database
- Memcached
- cloudera
- memcache
Software Tutorial
Mobile Game Tutorial

Home

Technical Articles

Database

Redis

How Redis uses optimistic locking to ensure data consistency

In Redis, there is often a situation where the value of a certain key is read, some business logic processing is performed, and then a new value is calculated based on the read value and set again. If client A has just read the key value, and then client B modifies the key value, then there will be a concurrency security issue. Problem simulation assumes that RedisServer has a key named test, which stores a json array [1,2,3]. Let us simulate the situation where client A and client B access modifications at the same time. The code is as follows: Client A: classRedisClientA(username:String,password

Jun 02, 2023 pm 04:52 PM

redis

What are the methods of using Redis cache in SpringBoot?

1. Import the Redis dependency org.springframework.bootspring-boot-starter-data-redis 2. Configure redis accordingly in application.properties #redis configuration #Redis server address spring.redis.host=127.0.0.1#Redis server Connection port spring.redis.port=6379#Redis database index (default is 0) spring.redis.database=0#Maximum number of connections in the connection pool (use negative values ??to indicate no limit) spr

Jun 02, 2023 pm 04:52 PM

redis springboot

How to use lua for nginx redis access control

1. Requirements analysis\1. There are many ways for Nginx to handle access control, and there are many implementation effects, such as access IP segments, access content restrictions, access frequency restrictions, etc. \2. Using Nginx+Lua+Redis for access restriction is mainly to consider the need for fast access control in high concurrency environments. \3. The process of Nginx processing requests is divided into 11 stages, namely: post-read, server-rewrite, find-config, rewrite, post-rewrite, preaccess, access, post-access, try-files, content, log.in open

Jun 02, 2023 pm 04:31 PM

redis lua nginx

What is the default serialization method for modifying Springsession redis?

1. The key configurations for configuring Spring-session-redis are as follows: 2. View the RedisHttpSessionConfiguration source code as follows: @BeanpublicRedisTemplatesessionRedisTemplate(RedisConnectionFactoryconnectionFactory){RedisTemplatetemplate=newRedisTemplate();template.setKeySerializer(newStringRedisSerializer()

Jun 02, 2023 pm 03:58 PM

redis springsession

How to set redis to start automatically at boot under Linux

The specific method of setting up redis to start automatically on Linux 1. Set daemonize in redis.conf to yes to ensure that the daemon process is enabled. 2. Write the self-starting script vi/etc/init.d/redis. Look at the directory clearly. You are creating a new redis file under etc/init.d. Why? Because Linux will execute the file writing script in this directory when booting. I don’t know how to write the script. , but there are people on the Internet who know it, just bring it #chkconfig:23451090#description:StartandStopredisPATH=/usr/local/bin:/sbin:/usr/bin:/bin

Jun 02, 2023 pm 03:52 PM

linux redis

How to configure the Redis SpringBoot class

importorg.springframework.context.annotation.Bean;importorg.springframework.context.annotation.Configuration;importorg.springframework.data.redis.connection.RedisConnectionFactory;importorg.springframework.data.redis.core.RedisTemplate;importorg.spri

Jun 02, 2023 pm 03:37 PM

redis springboot

How to use Redis in SpringBoot

1. The maven dependencies are as follows. It should be noted that spring-boot-starter-data-redis uses lettuce as the redis client driver by default, but lettuce is less practical. We often use jedis as the client driver. So lettuce is excluded here and jedis is introduced: org.springframework.bootspring-boot-starter-data-redisio.lettucelettuce-coreredis.clientsjedis2. Dependencies springdatar

Jun 02, 2023 pm 02:43 PM

redis springboot

How to implement Redis publish and subscribe

Suppose we have such a business scenario. After placing an order and paying on the website, we need to notify the inventory service for delivery processing. It is not difficult to implement the above business. We only need to provide the inventory service to the relevant outlets, and after placing the order and paying, we only need to call the inventory service. If there is a new business later, such as points service, he needs to obtain the order payment results and then increase the user's points. This is not difficult to implement. The points service also provides an interface. After placing an order and paying, you only need to call the inventory service. If you only need to obtain the order and payment results for two businesses, that's okay, and the program modification will be quick. However, as the business continues to develop, more and more new businesses are said to be the result of placing orders and paying. At this time we will find that there are many problems with the system architecture above: Chapter 1

Jun 02, 2023 pm 02:37 PM

redis

Three methods of Redis deletion strategy and analysis of eviction algorithm examples

1. Preface Before the article begins, let me ask you a question: When we use the command: expirekeysecond to set the expiration time for a key, once the expiration time is up, is the expired data corresponding to this key really deleted immediately by the server? The answer is that it will not be deleted immediately. Knowing this answer, let's take a look at how expired data is handled in Redis. 2. Data characteristics in Redis Redis is a memory-level database. All data is stored in the memory. The data in the memory can obtain its status through TTL instructions. There are three states: Instruction result status XX Time-sensitive data -1 Permanently valid data - 2 Expired data or deleted data or undefined data 3. Timeliness number

Jun 02, 2023 pm 01:43 PM

redis

How to install PHP7 Redis extension on CentOS7

Note when installing extensions: The first time you use a non-root user, you fail. If you switch to a root user, you will successfully download the extension package. After finding the matching version, wget downloads it to the server, decompresses it and enters the directory tarzxfredis-4.0.1.tgz, cdredis- 4.0.1; Find phpize and execute. Find php-config and configure make&&makeinstall. After compilation, redis.io is already in the /usr/local/php/lib/php/extensions/no-debug-non-zts-20170718/ extension directory. ;Modify php.ini to add

Jun 02, 2023 am 11:46 AM

php redis centos7

How to implement EMQ X Redis data persistence

Introduction to EMQX data persistence. The main usage scenarios of data persistence include recording operations such as client online and offline status, subscription topic information, message content, and sending message receipts after message arrival to Redis, MySQL, PostgreSQL, MongoDB, Cassandra, AWS DynamoDB, etc. A class database is used for quick query by external services or retains the current running state when the service is down or the client is abnormally offline, and is restored to the previous state when the connection is restored; persistence can also be used for client agent subscriptions. When the device client comes online, persistence The module loads preset topics directly from the database and completes proxy subscription, reducing system design complexity and client subscription communication overhead. Users can also subscribe by

Jun 02, 2023 am 11:43 AM

redis emq x

How Docker deploys SpringBoot projects and integrates Redis images for access counting

The final effect is as follows: 1. Install DockerCE2. Run the Redis image 3. Java environment preparation 4. Project preparation 5. Write Dockerfile 6. Release the project 7. Test service environment preparation system: Ubuntu17.04x64Docker17.12.0-ceIP:45.32. 31.101 1. Installing DockerCE in China is not recommended: "Script to install", the download and installation will be very slow, use step 1 to install, see the link below: Conventional installation method 1. Conventional installation method Ubuntu17.04x64 installs DockerCE2. Script to install domestically It is not recommended to use scripts for installation: Install DockerCE

Jun 02, 2023 am 10:37 AM

redis docker springboot

How to build a redis-sentinel cluster based on docker

1. Overview Redis cluster can achieve high availability and sharding among a group of redis nodes. There will be 1 master and multiple slave nodes in the cluster. When the master node fails, a slave node should be elected as the new master. However, redis itself (including many of its clients) does not have the ability to implement automatic fault discovery and perform active-standby switching, and requires an external monitoring solution to achieve automatic fault recovery. redissentinel is the officially recommended high availability solution. It is a monitoring and management tool for redis clusters, which can provide node monitoring, notification, automatic fault recovery and client configuration discovery services. 2. Problems encountered 1. dock

Jun 02, 2023 am 10:19 AM

redis docker sentinel

How spring boot integrates redis master-slave sentinel method

Springboot integrates redis master-slave sentinel one master, two slaves and three sentinel configuration 1, master:127.0.0.1:63792, slave1:127.0.0.1:63803, slave2:127.0.0.1:63814, sentinel1:127.0.0.1:263795, sentinel2:127.0 .0.1:264796, sentinel3:127.0.0.1:265797, monitoring host name: mymaster8, attach the configuration of sentinel1 port26379sentinelmonitorm

Jun 02, 2023 am 09:22 AM

redis spring boot