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Database

Redis

How to use Redis cache elimination strategy and transactions to implement optimistic locking

Cache elimination strategy title LRU principle The LRU (Least recently used, least recently used) algorithm eliminates data based on the historical access records of the data. Its core idea is "if the data has been accessed recently, the probability of being accessed in the future is also higher." The most common implementation is to use a linked list to save cached data. The detailed algorithm is implemented as follows: new data is inserted into the head of the linked list; whenever the cache hits (that is, the cached data is accessed), the data is moved to the head of the linked list; when the linked list is full time, discard the data at the end of the linked list. In Java, you can use LinkHashMap to implement LRU using hash linked lists: Title Redis cache elimination strategy sets the maximum cache in redis, allowing users

Jun 03, 2023 pm 04:05 PM

redis

How to check Redis status in Linux system

makemakePREFIX=/usr/local/redisinstallmkdir/etc/redis/cpredis.conf/etc/redis/Open the redis.conf file and modify daemonizeyes to run vim/etc/redis/redis.conf in the background and use the configuration file to start the redis service./ redis-server/etc/redis/redis.conf How to check that the redis service starts normally? Use ps to view or netstatpsaux|grepredis-servernetstat-tunp

Jun 03, 2023 pm 03:49 PM

Linux redis

How to use Redis to solve high concurrency

Short for NoSQLNotOnlySQL. NoSQL was proposed to solve the inability of traditional RDBMS to deal with certain problems. That is, non-relational databases, they do not guarantee the ACID characteristics of relational data, and there is generally no correlation between data. They are very easy to implement in terms of expansion and have high performance. Redisredis is a typical representative of NoSQL and is also a must-use technology for current Internet companies. Redis is a key-value (Key-Value) storage database, which mainly uses hash tables. Most of the time, it is used directly in the form of cache, so that the request does not directly access the disk, so the efficiency is very good, and it can fully meet the needs of small and medium-sized enterprises. Common data type characters

Jun 03, 2023 pm 03:43 PM

redis

How to implement Redis coupon flash sale function

1. Global unique ID 1. Global ID generator Each store can issue coupons: when a user rushes to buy, an order will be generated and saved in the tb_voucher_order table. However, if the order table uses the database to automatically increment the ID, there will be some problems: id The regularity is too obvious and is limited by the amount of data in a single table, so the primary key of the tb_voucher_order table cannot use auto-increment ID: createtabletb_voucher_order(idbigintnotnullcomment'primarykey'primarykey,user_idbigintunsignednotnullco

Jun 03, 2023 pm 03:39 PM

redis

What is the SpringSecurity+Redis authentication process?

The preface introduces the popular technology stack combination for permission management on the market today, which is ssm+shrioSpringCloud+SpringBoot+SpringSecurity. This combination naturally has its own characteristics. Due to the automatic injection configuration principle of SpringBoot, SpringSecurity is automatically injected and managed when the project is created. The filter container (DelegatingFilterProxy), and this filter is the core of the entire SpringSercurity. Masters the entire permission authentication process of SpringSercurity, and SpringBoot helps you automatically inject it, and use ssm to complete it.

Jun 03, 2023 pm 03:22 PM

redis springsecurity

How to implement SMS login in Redis shared session application

1. Implementing SMS login based on session 1.1 SMS login flow chart 1.2 Implementing sending SMS verification code Front-end request description: Description of request method POST request path /user/code request parameter phone (phone number) return value No back-end interface implementation: @Slf4j@ ServicepublicclassUserServiceImplextendsServiceImplimplementsIUserService{@OverridepublicResultsendCode(Stringphone,HttpSessionsession){//1. Verify mobile phone number if

Jun 03, 2023 pm 03:11 PM

redis session

How to use django redis

1. Explain that redis, as a cache database, plays a great role in all aspects. Python supports operating redis. If you use Django, there is a redis library specially designed for Django, namely django-redis2. Install pipinstalldjango-redis3. Configuration 3.1 To configure redis, open the Django configuration file, such as setting.py, and set the CACHES item CACHES={"default":{"BACKEND":"django_redis.cache.Redis

Jun 03, 2023 pm 02:53 PM

redis django

How to apply the 5 data types in Redis

Problems with the MySql+Memcached architecture. In fact, MySQL is suitable for massive data storage. Hotspot data is loaded into the cache through Memcached to speed up access. Many companies have used such an architecture, but as the amount of business data continues to increase, and access As the volume continues to grow, we have encountered many problems: 1. MySQL needs to continuously remove databases and tables, and Memcached also needs to continue to expand. The expansion and maintenance work takes up a lot of development time. 2. Data consistency issues between Memcached and MySQL database. 3. Memcached data hit rate is low or the machine is down. A large number of accesses directly penetrate to the DB, and MySQL has no

Jun 03, 2023 pm 02:51 PM

redis

What are the eight classic problems of Redis?

1. Why use Redis analysis: The blogger feels that using redis in the project is mainly considered from two perspectives: performance and concurrency. Of course, redis also has other functions such as distributed locks, but if it is just for other functions such as distributed locks, there are other middleware (such as zookpeer, etc.) instead, and it is not necessary to use redis. Therefore, this question is mainly answered from two perspectives: performance and concurrency. Answer: As shown below, it is divided into two points (1) Performance As shown in the figure below, when we encounter SQL that takes a particularly long time to execute and the results do not change frequently, it is especially suitable to put the running results into the cache. In this way, subsequent requests will be read from the cache, so that requests can be responded to quickly. Digression: suddenly

Jun 03, 2023 pm 02:44 PM

redis

How to clear all data in Redis

Summary of steps to clear all data in Redis 1. Open the cmd command window and switch to the bin folder in the Redis installation directory 2. In the cmd command window, enter the connection Redis command: redis-cli.exe-h127.0.0.1-p63893, connect After success, if Redis configures the password mode, you first need to enter a legal password. If there is no configuration, you can directly filter this step authabc1234. In the cmd command window, enter the command to clear all Redis data: flushallRedis data clearing policy Redis clearing expired policy redis setting key Expired name setnx, when the key expires, k will be automatically cleared

Jun 03, 2023 pm 02:25 PM

redis

What are the Redis specifications?

Redis has powerful functions and rich data types. No matter how fast the system is, it cannot withstand crazy abuse. By disabling some high-risk functions and hanging the shackles of development, the business can consider problems with concise and general ideas instead of being bound to a certain implementation. Redis will have different persistence strategies and eviction strategies based on different uses. Therefore, before using and applying for a Redis cluster, please clarify whether it is used for caching or storage. The redis cluster has two modes: master-slave and cluster, each with its own advantages and disadvantages. The following specifications do not distinguish between cluster modes. We explain them in terms of usage scenarios and operational restrictions. Using specifications to distinguish hot and cold data Although redis supports persistence, storing all data in redis costs

Jun 03, 2023 pm 02:19 PM

redis

What are the methods for operating redis in python?

Python operates redis and uses a connection pool: redis-py uses connectionpool to manage all connections to a redisserver to avoid the overhead of establishing and releasing a connection each time. By default, each Redis instance maintains its own connection pool. You can directly establish a connection pool and then use it as parameter Redis, so that multiple Redis instances can share a connection pool. defgetcoon():pool=redis.ConnectionPool(host='192.168.25.126',port=6379,password

Jun 03, 2023 pm 01:45 PM

Python redis

How Redis uses ZSET to implement message queue

1. Redis uses zset as a message queue. How to handle the message backlog and change the consumer's consumption capacity: You can increase the number of consumers, or optimize the consumer's consumption capacity so that it can process messages faster. At the same time, parameters such as the number of consumers, consumption rate, and priority can be dynamically adjusted according to the number of messages in the message queue. Filter expired messages: Move expired messages out of the message queue to reduce the length of the queue so that consumers can consume unexpired messages in a timely manner. You can use the zremrangebyscore() method provided by Redis to clean up expired messages. Segment the message: Segment the message and distribute it to different message queues so that no

Jun 03, 2023 pm 01:14 PM

redis zset

Analysis of Linux Redis Automated Mining Infection Worm Instances

1. Background Since the disclosure of the attack method of obtaining root permissions of Linux system through Redis unauthorized issue, due to its ease of use, hackers who use this issue to invade Linux services for mining, scanning, etc. have been emerging in endlessly; and in many cases that exploit this issue Among the cases of invading servers for black production, there is one type that exploits this problem for mining and uses pnscan to automatically scan and infect other machines; this type of attack has always existed, but has shown an increasing trend in recent times, and was recently captured Many times, we will make a detailed analysis on it. 2. Vulnerability Description First, let me explain the exploited vulnerability. By default, Redis will be bound to 0.0.0.0:6379.

Jun 03, 2023 pm 12:48 PM

Linux redis