思热99re视热频这里只精品,久久亚洲欧美国产精品

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 to solve Redis cache penetration and cache avalanche problems

How to solve the problem of Redis cache penetration and cache avalanche. Cache avalanche: Since the cache layer carries a large number of requests, it effectively protects the storage layer. However, if the cache layer cannot provide services for some reasons, such as the Redis node hangs up and the hotspot keys are all Failure. In these cases, all requests will be made directly to the database, which may cause database downtime. To prevent and solve the cache avalanche problem, you can start from the following three aspects: 1. Use Redis high-availability architecture: use Redis cluster to ensure that the Redis service will not hang up. 2. Inconsistent cache time: add a cache expiration time. Random values ??to avoid collective failure 3. Current limiting and downgrading strategy: There are certain filings, such as personalized recommendation services

May 31, 2023 pm 07:45 PM

redis

Redis distributed lock instance analysis

Overview of distributed locks In a multi-threaded environment, in order to ensure that a code block can only be accessed by one thread at the same time, in Java we can generally use synchronized syntax and ReetrantLock to ensure that this is actually a local lock method. But now companies are adopting distributed architecture. In a distributed environment, how to ensure that threads on different nodes execute simultaneously? Therefore, distributed locks are introduced, which are a way to control mutually exclusive access to shared resources between distributed systems. In a distributed system, multiple services are deployed on multiple machines. When a user on the client initiates a data insertion request, if there is no distributed lock mechanism guarantee, then multiple services on the multiple machines may perform concurrently. Penetration fuck

May 31, 2023 pm 07:32 PM

redis

How to implement Redis String operation in php

String operation //Set key value: Return true successfully, otherwise return false$redis->set('mystr','Welcome!');//Get key value: Return String type key value successfully, if the key does not exist or is not String type returns false $ret=$redis->get('mystr');//Start from the specified offset of the string stored in a key, replace it with another specified string, and successfully return the new string after replacement The length of the string. $ret=$r

May 31, 2023 pm 07:13 PM

php redis string

What are the commands to check the redis version on Linux system?

1. Use the "redis-server-version" command or "redis-server-v", redis-server is in the src directory in the redis installation directory [root@db148redis-2.6.10]#src/redis-server--versionRedisserverv= 2.6.10sha=00000000:0malloc=jemalloc-3.2.0bits=32[root@db148redis-2.6.10]#./src/redis-server-vRedisserv

May 31, 2023 pm 06:43 PM

linux redis

How to deploy redis cluster in k8s

redis cluster building 1.1 Use redis-cli to create a cluster #View the ipkubectlgetpod-njxbp-owide corresponding to the redis pod>NAMEREADYSTATUSRESARTSAGEIPNODENOMINATEDNODEREADINESSGATESredis-01/1Running018h10.168.235.196k8s-masterredis-11/1Running018h10.168.235.225k 8s-masterredis-21/1Running018h10.168 .

May 31, 2023 pm 05:25 PM

redis k8s

What are the basic data query commands in redis?

(1) Key query 1. Query all keyKEY*2. Query the keyKEY* character* that contains a certain character. For example, query the key that contains the character chen. KEY*chen*3. Query the type of key TYPEkey4. Query whether a certain key exists EXISTSkey ( 2) Five data type query commands 1. String query 1.1 Query the value of string type key GETstring_key1.2 Query the length of string type key STRLENstring_key1.3 Query the value of multiple string type keys MGETstring_key1[string_key2..... ]2.hash

May 31, 2023 pm 05:19 PM

redis

What are the Redis interview questions and answers?

Let’s talk about the basic data types of Redis. Strings: Redis does not directly use the traditional string representation of C language, but implements its own abstract type called simple dynamic string SDS. The string in C language does not record its own length information, but SDS saves the length information, which reduces the time to obtain the string length from O(N) to O(1), while avoiding buffer overflow and reducing the need to modify characters. The number of memory reallocations required for the length of the string. Linked list linkedlist: The redis linked list is a two-way acyclic linked list structure. Many publish and subscribe, slow query, and monitor functions are implemented using linked lists. The nodes of each linked list are represented by a listNode structure. Each node has

May 31, 2023 pm 04:55 PM

redis

Docker installation Redis instance analysis

1. Start dockersystemctlstartdocker2. Pull the redis image dockerpullredis:5.0.3. Note that if the version number is not specified, pull the latest version. 3. Create a local redis mounting directory mkdir-p/root/redis/data/root/redis/ conf4. Create the redis.conf file touch/root/redis/data/root/redis/conf/redis.conf5. Modify the redis.conf file download link: https://www.lanzous.com/i68hla

May 31, 2023 pm 04:52 PM

redis docker

How to install and configure redis

Simply put, 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. Install, download, decompress and compile: $wgethttp://download.redis.io/releases/redis-4.0.10.tar.gz$tarxzfredis-4.0.10.tar.gz$mvredis-4.0.10/usr/local/ The redis$cd/usr/local/redis$make binary file is in the src directory after compilation. $ll-asrc |

May 31, 2023 pm 04:40 PM

redis

What are the troubleshooting and solutions for BigKey in Redis?

Summary Redis is an in-memory database with strong performance, but during use, we may encounter BigKey problems. This problem is that the value of a certain key in Redis is too large, so the BigKey problem is essentially a BigValue problem, causing the performance of Redis decline or collapse. Introduction to the BigKey problem In Redis, each key has a corresponding value. If the value of a certain key is too large, it will cause the performance of Redis to decline or crash. It is more metaphysical than metaphysical, because Redis needs to load all large keys into In memory, this will occupy a large amount of memory space and reduce the response speed of Redis. This problem is called Big

May 31, 2023 pm 03:59 PM

redis bigkey

How to implement flash sale system in redis

1. Design Ideas The flash kill system is characterized by a large amount of concurrency. Tens of thousands of requests may come in in one second. If some measures are not taken, the system will collapse in minutes. Let’s discuss how to design a flash kill system that can be played. 1. Current limiting: First of all, business logic is not considered. If there is the following simplest interface: @GetMapping("/test")publicStringtest(){return "success";} This is the simplest interface without any logic. But if there are thousands of requests to access this interface at the same time, the server will also crash. Therefore, the first thing that a high-concurrency system should do is to limit the current flow.

May 31, 2023 pm 03:11 PM

redis

How to use PHP+Redis to implement ranking list

Implement a small functional ranking list through PHP and redis. The data type used is an ordered set: zrevrange ascending sorting, zrange descending sorting/***ranking list*/publicfunctionrank(){//$this->zrem($this- >cachekey);$this->redis->del($this->cachekey);$dataOne=[];for($i=0;$iget_random(6,'abcdefghijklmnopqrstuvwxyzABCDEFJHIJ

May 31, 2023 pm 01:46 PM

php redis

What are the methods of using redis in laravel?

1. Set/get operations are common set/get operations. If the key name exists, the set operation will overwrite the original value. $redis=app("redis.connection");$redis->set('library', 'phpredis');//Storage key is library, the value phpredis is recorded $redis->get("library");//Get key is library record value set/get multiple keys

May 31, 2023 pm 01:43 PM

laravel redis

What is the method to install Redis extension for Linux in PHP7.2

Copy the link address, download, decompress, compile and install [root@zzmingsoft]#wgethttp://pecl.php.net/get/redis-4.2.0.tgz[root@zzmingsoft]#tar-xzvfredis-4.2.0.tgz[root @zzmingsoft]#cdredis-4.2.0[root@zzmingredis-4.2.0]#phpize[root@zzmingredis-4.2.0]#./configure--with-php-config=/usr/local/php7.2

May 31, 2023 pm 12:46 PM

php linux redis