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How to use php+redis to implement optimistic locking

header("content-type:text/html;charset=utf-8");$redis=newredis();$result=$redis->connect('127.0.0.1',6379);$mywatchkey=$redis- >get("");$rob_total=10;//Snap-up quantity if($mywatchkeywatch("mywatchkey");$redis->multi();//Set the delay to facilitate testing the effect. sleep(5);// Insert rush purchase data $redi

Jun 03, 2023 am 10:09 AM

PHPredis

How to install Redis on Linux system

Introduction to redis: redis is an open source Key-Value database written in C language, supports network interaction, and can be memory-based or persistent. The official website address of redis is very easy to remember, it is redis.io. (I checked specifically and found that the domain name suffix io belongs to the national domain name and is britishIndianOceanterritory, which is the British Indian Ocean Territory) Currently, Vmware is funding the development and maintenance of the redis project. Features of redis: The reading speed of Redis is 110,000 times/s, and the writing speed is 81,000 times/s atom. All operations of Redis are atomic, and Redis also supports several operations

Jun 03, 2023 am 10:05 AM

Linuxredis

How to monitor redis memory in zabbix

1. Download the import template directly and import the template through the following steps: Click configuration->templates>import->Import the downloaded xml file. 2. Configure the client key on the monitored host, open the /etc/zabbix/zabbix_agentd.conf configuration file, and add in the last line: UserParameter=redis_stats[*],redis-cli-h127.0.0.1-p$1info |grep$2|cut-d:-f2 After the configuration is completed, pass /etc/init.d/zabbix_agentdre

Jun 03, 2023 am 10:00 AM

rediszabbix

How to use laravel redis cache

Step 1: Install Redis First, you need to install Redis on the server. On Ubuntu, you can install it through the following command: sudoapt-getupdatesudoapt-getinstallredis-server. If you are using other operating systems, you can download relevant documents from the Redis official website. to install. Step 2: Configure Laravel to use Redis cache in the application. You need to make relevant configurations in Laravel's configuration file first. Open the config/cache.php file and find 'default'=>env(&#

Jun 03, 2023 am 09:52 AM

redislaravel

Docker+Redis+SpringBoot connection method

After the Docker installation is successful, open dockerengine and add the domestic mirror "registry-mirrors": ["http://hub-mirror.c.163.com"]. To install the Redis mirror, enter https://hub.docker.com/. Search for redis and find the first official image. You can check how to start redis in the docker container. The related commands are as follows: dockerpullredis# pull the remote redis image dockerrun–namesome-redis-p6379:6379-d

Jun 03, 2023 am 09:46 AM

DockerredisSpringBoot

How to solve the Redis cache avalanche problem

The cache layer carries a large number of requests and effectively protects the storage layer. However, if a large number of requests arrive at the storage layer due to a large number of cache failures or the entire cache cannot provide services, the load on the storage layer will increase (a large number of requests query the database). This is the scenario of cache avalanche; to solve the cache avalanche, you can start from the following points: 1. Keep the cache layer highly available using Redis sentry mode or Redis cluster deployment method. Even if individual Redis nodes go offline, the entire cache layer can still be used. . In addition, Redis can be deployed in multiple computer rooms, so that even if the computer room crashes, the cache layer can still be highly available. 2. Both the cache layer and the storage layer of the current limiting and downgraded components will have the probability of errors. They can be regarded as

Jun 03, 2023 am 09:46 AM

redis

What is the specific method for remote connection to redis on Linux?

Redis, the remote dictionary service, is an open source log-type Key-Value database written in ANSIC language, supports the network, and can be memory-based or persistent. Specific methods for Linux remote connection to redis Connect to remote redis-cli-h47.101.63.222-p56379 Connect to local redis-cli Set password configsetrequirepasspass_123456 Get password configgetrequirepass Login authpass_123456

Jun 03, 2023 am 09:40 AM

Linuxredis

How to install a six-node cluster in Redis

Introduction: rediscluster is a native cluster solution. Currently, it has made great progress in terms of high availability and stability. According to statistics and observations, more and more companies and communities are adopting the rediscluster architecture, which has become a de facto standard. Its main feature is decentralization and no need for proxy. One of the main design goals is to achieve linear scalability. The rediscluster server alone cannot complete the officially promised functions. In a broad sense, rediscluster should include both redis servers and client implementations such as jedis. They are a whole. Distributed storage is nothing more than

Jun 03, 2023 am 09:19 AM

redis

What are the differences between redis and Memcached?

Redis is a database, but unlike traditional databases, redis data is stored in memory, so the read and write speed is very fast, so redis is widely used in caching. memcached is a high-performance distributed memory cache server. The general purpose of use is to increase the speed and scalability of dynamic web applications by caching database query results and reducing the number of database accesses. Salvatore Sanfilippo, author of the authoritative comparison of Redis, once compared these two memory-based data storage systems: Redis supports server-side data operations: Compared with Memcached, Redis has more data structures and supports richer

Jun 03, 2023 am 09:14 AM

redismemcached

How to implement Redis data sharding

Introduction to Twemproxy Twitter's Twemproxy is currently the most widely used on the market and is used to provide redis cluster services. Since redis is single-threaded, and the official cluster is not very stable and widely used. Twemproxy is a proxy sharding mechanism. As a proxy, Twemproxy can accept access from multiple programs, forward it to each Redis server in the background according to routing rules, and then return to the original route. This solution well solves the problem of the carrying capacity of a single Redis instance. Of course, Twemproxy itself is also a single point and needs to use Keepalived as a high-availability solution (or LVS). by Twempr

Jun 03, 2023 am 09:05 AM

redis

What are the methods used by Go Redis client?

Introduction: The bottom layer of go-redis and redigo is implemented by calling the universal Do method, but redigo: since the input is a universal type, you must remember the parameters and return values of each command, which is very unfriendly to use. The parameter type is a universal type. As a result, the parameter type cannot be checked during the compilation phase. Each command requires time to record the usage method, number of parameters, etc., which is costly to use; go-redis: refines the functions of each redis command, we only need to remember Command, for specific usage, you can directly check the application of the interface, and the cost of use is low; secondly, it unifies the data type according to the underlying type of redis, which can help check the parameter type during compilation and its response is uniformly Res.

Jun 03, 2023 am 09:01 AM

Goredis

How to use opsForValue of RedisTemplate

Use of the opsForValue() method in Redis 1. set(Kkey, Vvalue) adds a string type value, key is the key, and value is the value. redisTemplate.opsForValue().set("stringValue","bbb"); 2. get(Objectkey) gets the value corresponding to the key key. StringstringValue=redisTemplate.opsForValue().get("key")3. append(Kkey,St

Jun 03, 2023 am 08:55 AM

redisTemplateopsforvalue

How to use the Redis command line tool

When executing a single command to access the Redis server, we usually use redis-cli to enter the interactive mode, and then read and write the server by asking and answering questions. In this case, we use its "interactive mode". There is another "direct mode", which executes the command and obtains the output results by passing the command parameters directly to redis-cli. $redis-cliincrbyfoo5(integer)5$redis-cliincrbyfoo5(integer)10If the output content is large, you can also redirect the output to an external file$redis-cliinfo>info.txt$wc-linfo.txt120i

Jun 03, 2023 am 08:53 AM

redis

Centos7.6 installation Redis instance analysis

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 03, 2023 am 08:28 AM

redisCentOS