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Technical Articles

Database

Redis

What are the strange data types and cluster knowledge of redis?

Various data types The string type is simple and convenient, and supports space pre-allocation, that is, more space will be allocated each time, so that if the string becomes longer next time, there is no need to apply for additional space. Of course, the premise is that the remaining space is enough. . The List type can implement a simple message queue, but note that messages may be lost. It does not support ACK mode. The Hash table is a bit like a relational database, but when the hash table becomes larger and larger, please be careful to avoid using statements such as hgetall, because requesting a large amount of data will cause redis to block, so the brothers behind will have to wait. The set collection type can help you do some statistics. For example, if you want to count the active users on a certain day, you can directly add user I

Jun 02, 2023 pm 10:01 PM

redis

How to solve the error when installing redis on ubuntu

Troubleshooting and solving redis installation in ubuntu system $wgethttp://download.redis.io/releases/redis-6.0.6.tar.gz#wget command to download the redis installation file, you can also download the compressed package from the official website $tar-xvfredis- 6.0.6.tar.gz#Decompress the downloaded compressed package $mvredis-6.0.6/usr/local/redis#Move the redis installation to /usr/local/, not necessary $cd/usr/local/ redis#Enter this directory

Jun 02, 2023 pm 09:56 PM

Ubuntu redis

Example analysis of Redis master-slave technology

Redis replication In the production environment, Redis uses persistence functions (RDB and AOF technology) to ensure that there will be no loss (or a small loss) of data even if the server is restarted. However, since the data is stored on a server, if this server has problems such as hard disk failure (encountered many times in the production environment), data will also be lost. In order to avoid single points of failure, the usual approach is to copy the database Multiple copies can be deployed on different servers, so that even if one server fails, other servers can still provide services as quickly as possible. To this end, Redis provides a replication function, which can automatically copy the updated data to the same database when the data in a database is updated.

Jun 02, 2023 pm 09:53 PM

redis

What is the implementation principle and process of Redis persistence mechanism?

What is the implementation principle of Redis persistence mechanism? Persistence: Redis is an in-memory database, and data is stored in memory. In order to avoid permanent loss of data due to process exit, the data in Redis needs to be regularly saved from memory to the hard disk in some form (data or commands); next time When Redis restarts, persistent files are used to achieve data recovery. In addition, for disaster backup, persistent files can be copied to a remote location. What is the persistence process? Since redis data can be saved on disk, what is the process like? There are the following five processes: (1) The client sends a write operation to the server (the data is in the client's memory). (2) Number of write requests received by the database server

Jun 02, 2023 pm 09:43 PM

redis

How to use Redis streams

After the introduction of modules in Redis 4.0, users began to think about how to fix these problems themselves. One of the users, Timothy Downs, told me via IRC: \I plan to add a transaction log-style data type to this module - this means that a large number of subscribers can do things like publish/subscribe without causing a huge increase in redis memory. The thing\subscribers hold their position in the message queue instead of having Redis have to maintain the position of each consumer and copy the message for each subscriber. His idea inspired me. I thought about it for a few days and realized that this might be an opportunity for us to address all of the above at once. I need to

Jun 02, 2023 pm 09:42 PM

redis streams

How to use Redis to implement search interface

For back-end developers, a single SQl can be used to implement the list query interface. If the query conditions are complex and the table database design is unreasonable, the query will be difficult. This article will share with you how to use Redis to implement the search interface. Let's start with an example. This is the search condition of a shopping website. If you were asked to implement such a search interface, how would you implement it? Of course, you said that with the help of search engines, such as Elasticsearch, you can implement it. But what I want to say here is, what if you want to implement it yourself? As you can see from the picture above, search is divided into 6 categories, and each category is divided into subcategories. In the middle, there is an intersection between the major categories of conditions. There are single selection, multiple selection, and customized situations in each subcategory.

Jun 02, 2023 pm 09:31 PM

redis

How to implement SpringBoot integration with Redis cache

Cache components supported by SpringBoot In SpringBoot, the cache management and storage of data relies on the cache-related org.springframework.cache.Cache and org.springframework.cache.CacheManager cache manager interfaces in the Spring framework. If there is no bean component of type CacheManager or a CacheResolver cache resolver named cacheResolver defined in the program, SpringBoot will try to enable the following cache components (in the specified order): (1) Generic (

Jun 02, 2023 pm 09:28 PM

redis SpringBoot

Redis+SpringBoot case analysis

1. Project environment Front-end technology stack: Vue-Cli Front-end software: WebStorm2020.3 Front-end style: Bootstrap Back-end technology stack: SpringBoot Back-end software: IntelliJIEDA2019 JavaJDK: 1.8 Server: Alibaba Cloud Centos7 Others: MyBatis, Redis, MySql, Docker, Shiro 2. Project demonstration project source code: shoppingProject01_pub:version6.0 project reference: Project05; bad person_Vue-Cli; bad person_Redis; bad person_Axios; Shang Silicon Valley_Redis project

Jun 02, 2023 pm 09:09 PM

redis SpringBoot

How to use redis delayed double delete strategy

In the current environment, we usually prefer redis cache to reduce our database access pressure. However, we will also encounter the following situation: when a large number of users access our system, they will first query the cache. If there is no data in the cache, they will query the database, then update the data to the cache, and if the data in the database has changed It needs to be synchronized to redis. During the synchronization process, the data consistency between MySQL and redis needs to be ensured. It is normal for a short data delay to occur during this synchronization process, but in the end it is necessary to ensure the consistency between mysql and the cache. //We usually use redis logic //Usually we query reidsStringvalue=RedisUt first

Jun 02, 2023 pm 08:32 PM

redis

How to solve the problem that springboot cannot connect to redis

The first way is to check whether the firewall opens port 6379 and check the firewall status systemctlstatusfirewalld if the firewall is not started. You can choose to look directly at the latter two methods. Or just open the firewall, and then continue with the following steps: open the port firewall-cmd--zone-public--add-port=6379/tcp--permanent#Display success--permanent means it will take effect permanently. Without this parameter, it will be invalid after restarting and restart the firewall. firewall-cmd--reload#Display successView the open ports of the firewall fire

Jun 02, 2023 pm 08:31 PM

redis SpringBoot

What is the method for using Redis in ThinkPHP framework in Pagoda?

Redis is a commonly used non-relational database, mainly used for data caching. The data is saved in the form of key-value, and the key values map to each other. Its data storage is different from MySQL. Its data is stored in memory, so data reading is relatively fast, which is very good for high concurrency. Regarding the installation of redis, install the pagoda panel on the server or virtual machine to install redis, so that you can use redis very easily. Remember that when installing redis, you must not only install the redis software, but also enter the PHP version used by the project to install the redis extension. Then open the redis software 1. First, find redis in the installation panel of the pagoda and click Install. 2. Install redi

Jun 02, 2023 pm 08:31 PM

redis thinkphp

Python Redis data processing methods

1. Foreword Redis: RemoteDictionaryServer, that is, remote dictionary service. The bottom layer of Redis is written in C language. It is an open source, memory-based NoSql database. Because Redis performance far exceeds other databases, it also supports clustering, distribution, master-slave synchronization, etc. Advantages, so it is often used in scenarios such as caching data and high-speed reading and writing. 2. Preparation Let’s take the installation of Redis-Server on the cloud server Centos7.8 as an example. First, install the Redis database on the cloud server #Download epel warehouse yuminstallepel-release #Install redisyuminstallredis Then, via vim command

Jun 02, 2023 pm 08:19 PM

Python redis

Redis usage example analysis

The first part: Native jedis connects to redis. First of all, we need to understand that when we originally used mysql, we used jdbc to connect to the database. In the same way, if we connect to redis here, we must use jedis. The first step: Create a new java project, import the package to create a new java project, and import the package redis.clientsjedis3.3.0com.alibabafastjson1.2.73. Step 2: Open the redis service, write a method to open the redis service, create a new test class, and write a method publicclassPing{publicstaticvoidmain (String[]args){Jedi

Jun 02, 2023 pm 08:04 PM

redis

What are the common commands for keys and strings in Redis?

Redis related knowledge The default port number of Redis is 6379 and there are 16 databases by default. Similar to array subscripts starting from 0, the initial default is to use library No. 0. Use the command select to switch databases. Such as: select8. Unified password management, all libraries have the same password. dbsize checks the number of keys in the current database. flushdb clears the current library. flushall kills all libraries. Redis is a single-threaded + multi-channel IO multiplexing technology. Multiplexing refers to using a thread to check the readiness status of multiple file descriptors (Socket), such as calling the select and poll functions, passing in multiple file descriptors, and if one file descriptor is ready, return, otherwise blocked straight

Jun 02, 2023 pm 07:20 PM

redis