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What is the principle of Redis data structure?

What is the principle of Redis data structure?

RedisDbRedis server has 16 databases by default, and one database corresponds to one RedisDB data structure. typedefstructredisDb{dict*dict;dict*expires;dict*blocking_keys;dict*ready_keys;dict*watched_keys;......}dict: key space hash table, used to store all key-value pairs expires: expiration time hash table, Store the expiration time of keys blocking_keys: keys in blocked state and corresponding clientready_keys: keys in unblocked state and corresponding

May 28, 2023 pm 10:26 PM
redis
Centos7.0 installation Redis instance analysis

Centos7.0 installation Redis instance analysis

1. Prepare the environment VM virtual machine / buy a server Centos7. .com/s/12qNGdoEFaZ0o-TOHB7KniA Extraction code: w80y Copy this content and open the Baidu Netdisk mobile app. The operation is more convenient. 3. Upload the downloaded redis data package to Linux. I used Xftp to upload it. 4. Unzip the file. [root@Redis1~]

May 28, 2023 pm 10:04 PM
redis CentOS
How to use Lettuce in Redis

How to use Lettuce in Redis

1. Summary Lettuce is an advanced Java client for Redis. It has become one of the most popular clients alongside Jedis. It has now become the default redis client in SpringBoot2.0 version. Compared with the veteran Jedis, Lettuce is a rising star. It is not only rich in functions, but also provides many new features, such as asynchronous operations, reactive programming, etc., and also solves the problem of thread insecurity in Jedis. 2. Lettuce2.1, basic use First, create a maven project, introduce the lettuce-core package, and you can use it. io.lettucelettuce-core5.3.1.RELE

May 28, 2023 pm 09:51 PM
redis lettuce
How to use the automatic expiration mechanism in Redis

How to use the automatic expiration mechanism in Redis

The automatic expiration mechanism in Redis realizes the requirements: processing orders that expire and automatically cancel, such as automatically changing the order status if the order is not paid for 30 minutes. 1. Use RedisKey to automatically expire the event notification. 2. Use the scheduled task to check after 30 minutes. 3. Train every minute. Check CREATETABLE`order_number`(`id`int(11)NOTNULLAUTO_INCREMENT,`order_name`varchar(255)DEFAULTNULL,`order_status`int(11)DEFAULTNULL,`order_token`varchar(255)D

May 28, 2023 pm 09:40 PM
redis
How to use @Cacheable in the integration of springboot and redis

How to use @Cacheable in the integration of springboot and redis

First we need to configure a cache manager, and then we can use cache annotations to manage the cache packagecom.cherish.servicebase.handler;importcom.fasterxml.jackson.annotation.JsonAutoDetect;importcom.fasterxml.jackson.annotation.PropertyAccessor;importcom.fasterxml.jackson .databind.ObjectMapper;importorg.springframe

May 28, 2023 pm 08:59 PM
redis SpringBoot @cacheable
What are the common operation commands of Redis basic data type List?

What are the common operation commands of Redis basic data type List?

Redis data type List operation in redis can cleverly use lists into stacks, queues, blocking queues, etc. 1. Push to insert elements 1. lpush, insert one value or multiple values ​​at the head into the head of the list. lpushlistonelpushlisttwolpushlistthree uses lpush. The l here can be regarded as left, that is, inserted on the left, so the current list is like this [three, two, one]. 2.rpush, insert at the end Next, use rpush to insert elements on the right, that is, at the end of the list. rpushlistright1right2 At this time,

May 28, 2023 pm 08:43 PM
redis list
Example analysis of distributed lock Redlock in Redis

Example analysis of distributed lock Redlock in Redis

Redlock implementation library JavaRedissonStar9458C#RedLock.netStar259Goredsync.goStar249Although the subsequent algorithm is the same, the number of likes is indeed convincing. Single-point Redis lock Let’s briefly review how a single-point Redis lock is implemented. Get the lock SETresource_namemy_random_valueNXPX30000 Client A sets a specific key-value pair on Redis and gives a timeout (to avoid deadlock). When other clients access, they first check whether the key already exists and the value is equal to my_random_value

May 28, 2023 pm 08:34 PM
redis redlock
Unable to connect to Redis How to solve the problem of Unable to connect to Redis

Unable to connect to Redis How to solve the problem of Unable to connect to Redis

Project scenario: Tip: Here is a brief description of the project-related background: The submit button in a certain project is not easy to use org.springframework.data.redis.RedisConnectionFailureException:UnabletoconnecttoRedis;nestedexceptionisio.lettuce.core.RedisConnectionException:Unabletoconnectto127.0.0.1/: 6379 Complete project error message: org.springframework.data.redis.

May 28, 2023 pm 08:16 PM
redis
Example analysis of Redis vulnerability exploitation

Example analysis of Redis vulnerability exploitation

1. Introduction Redis-related vulnerabilities have existed for a long time, and there are still scenarios that can be exploited. This time, we will summarize and reproduce the redis-related vulnerability exploits so that we can quickly establish exploitation ideas when encountering them in the future. 2. Introduction to redis Redis is a key-value storage system. Similar to Memcached, it supports relatively more stored value types, including string (string), list (linked list), set (**), zset (sortedset--ordered **) and hash (hash type). Redis largely compensates for the shortcomings of key/value storage such as memcached. In some cases, it can play a role in relational databases.

May 28, 2023 pm 08:08 PM
redis
How to install redis3.2 in stand-alone environment in centos7

How to install redis3.2 in stand-alone environment in centos7

The system version installed this time is as follows: [root@zhangqinglei~]#cat/etc/redhat-releaseCentOSLinuxrelease7.5.1804(Core)[root@zhangqinglei~]#lsb_release-aLSBVersion::core-4.1-amd64:core-4.1-noarch :cxx-4.1-amd64:cxx-4.1-noarch:desktop-4.1-amd64:desktop-4.1-noarch:languages-4.1-amd64:

May 28, 2023 pm 07:42 PM
redis CentOS
How to set the validity period of key in redis

How to set the validity period of key in redis

redis sets the validity period of the key. The Key command sets the expiration time of the key. Query all current keysexpirekeysecond: Set the expiration time of the key. If ttlkey is executed, it will display -2, which means that the changed value does not exist. If it displays -1 in the cache, it will be persistent (will not expire). If the expiration time is set, then it will Display the remaining expiration time and thoroughly understand the redis validity period issue EXPIREkeyseconds Starting version: 1.0.0 Time complexity: O(1) Return value: 1 if the expiration time is successfully set; 0 if the key does not exist or the expiration time cannot be set. Set the survival time for a given key. When the key expires (the survival time is 0), it will be automatically

May 28, 2023 pm 07:29 PM
redis key
How to analyze the principle of sentry mode in Redis

How to analyze the principle of sentry mode in Redis

This article will give you an in-depth understanding of the principles of the Redis sentinel mode, talk about what sentinel can do, start the sentinel method and the Sentinel workflow. I hope it will be helpful to you! 1. What is Redissentinel? RedisSentinel is the official high availability solution for Redis. RedisSentinel provides high availability for Redis. In practice, this means that using Sentinel you can create a Redis cluster that is resistant to certain types of failures and automatically implements failover without human intervention. [Related recommendation: Redis video tutorial] 2. What can sentinel do? 1. Monitoring

May 28, 2023 pm 07:18 PM
redis
What is the expiration policy in Redis

What is the expiration policy in Redis

Redis expiration strategy Redis mainly has two expiration deletion strategies: lazy deletion. Lazy deletion means that the key is detected when we query the key. If the expiration time has been reached, it is deleted. Obviously, one of its disadvantages is that if these expired keys are not accessed, they will never be deleted and will continue to occupy memory. Regular deletion means that redis checks the database every once in a while and deletes the expired keys in it. Since it is impossible to poll all keys for deletion, redis will randomly select some keys for checking and deletion each time.

May 28, 2023 pm 07:13 PM
redis
How to implement Redis protocol parser based on Golang

How to implement Redis protocol parser based on Golang

RESP protocol RESP is a protocol for communication between the client and the server. There are five formats: normal reply: starting with "+" and ending with "\r\n" in the form of a string. Error reply: starting with "-" and ending with " \r\n" in the form of a string integer: starting with ":" and ending in the form of a string "\r\n" Multi-line string: starting with "$", followed by the actual number of bytes sent, and then "\r\n" starts and ends with $3\r\nabc\r\nArray: starts with "*", followed by the number of members SETkeyvalue*3\r\n$3\r\nSET\r\n$3\r\ nkey\r\n$5\r\nvalue\r\nThe commands or data sent by the client and server must all end with

May 28, 2023 pm 07:13 PM
Golang redis

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