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Distributed data storage solution for 100 million users 1 1. Introduction MySQL Cluster is a high-performance, scalable and clustered database product. Its original intention of R & D and design is to meet the most severe application requirements in many industries. In these applications, the reliability of database operation is often ...

1, Canal introduction In the early days, Alibaba had the business requirement of cross machine room synchronization due to the deployment of dual machine rooms in Hangzhou and the United States. The implementation method was mainly to obtain incremental changes based on the business trigger. Since 2010, the business has gradually tried to obta ...

What is redis Redis is an open source (BSD licensed) in memory data structure storage system, which can be used as database, cache and message middleware. It supports many types of data structures, such as strings， hashes， lists， sets， sorted sets And range query, bitmaps， hyperloglogs and geospatial Index radius query. Redis has built ...

1. Smbms (supermarket management project) [external chain picture transfer failed. The source station may have an anti-theft chain mechanism. It is recommended to save the picture and upload it directly (img-r5ny1ksq-1632046547618) (smbms (supermarket management project)]. assets/20200516122458676.png) Database: [external chain picture trans ...

Mybatis plus tutorial Welcome to the "Java master" of the blogger official account, focusing on dry cargo articles in Java field. http://www.javaman.cn/jszw/mybatis-plus What is mybatis plus MyBatis-Plus (opens new window) (MP) is a MyBatis (opens new window) On the basis of MyBatis, the enhancement tool is only enhanced without ch ...

1, Redis global command operation 1. View all keys keys * -- Fuzzy search queries can also be used, but generally they are not pushed keys s* 2. View the total number of keys dbsize 3. Check if the key exists exists key 4. Delete key to return the number of deleted entries del key 5. Key expiration Return the remaining expiration ...

MySQL query sorting This note is the learning content of Alibaba cloud Tianchi Longzhu plan SQL training camp. The link is: https://tianchi.aliyun.com/specials/promotion/aicampsql ； 1.1 use of select Use format select Listing as 'alias', Listing ,.....from Table name where query criteria; Relevant rules An asterisk () means all columns. ...

Database notes Database foundation 1. Start MySql service on the terminal: net start mysql; 2. Connect to MySQL: (add one, not - proot; oh) mysql -h localhost -p 3306 -u root -proot (h Database links, p Database port number, u Database user name -p Database password, p (no space between and password) 3. View database: `show databases; ...

shiro Rights Management Overview Permission management realizes the control of users' access to the system and controls that users can access and only access their authorized resources according to security rules or security policies. In other words, rights management includes user identity authentication (login) and authorization (access rig ...

Mybatis - Basics ⭐ sketch Mybatis – MyBatis 3 | introduction - official address You can learn from the official address, and most of the content of this article is also quoted here 1 what is mybatis A persistence layer framework, which is also a semi ORM (semi automated) framework, encapsulates JDBC code at the bottom, so that p ...