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First of all, don't use the default service for the client connection, that is, the connection used by the application. The source of the original text is Real Application Clusters Administration and Deployment Guide: All of these services are used for internal management. You cannot stop or disable any of these internal services to do pl ...

Project introduction **Project address:** https://github.com/newbee-ltd/newbee-mall **Project Description: * * NewBee mall project is a set of e-commerce system, including NewBee mall system and NewBee mall admin mall background management system, based on spring boot 2 X and related technology stack development. The front desk mall system in ...

Scene reproductionIntroduction to terms and functions alive_tasksend_msgsender_task_send_msgconclusionresolventWrite at the end ❝ Recently, the backup and restore function under different data volumes has been tested, so a large amount of data needs to be migrated to the MGR cluster. However, when the amount of migrated dat ...

1. Introduction to Jason type The Json type is provided after MySQL 5.7, which is a type designed by MySQL combining structured storage and unstructured storage. In some situations, the Jason type is a blessing. Scenario 1: user portraits, labels describing users and other similar scenarios, such as patient health files in Internet hospital ...

Lab3 query optimization Exercise 1 selectivity estimation based on histogram The students who just read this chapter may be a little confused. Why did they say a lot of statistics? Because the essence of query optimization is to know in advance how to execute statements faster. Statistics can help us better estimate how much time it takes to ...

Spring boot uses Druid data sources When the program operates the database, it needs to use the database connection, and the performance of the database connection is related to the database connection pool. Druid is an open source database connection pool implementation of Alibaba. It combines the advantages of database connection pools such a ...

Installing and deploying MongoDB for Ubuntu I Introduction to MongoDB MongoDB is a database based on distributed file storage. Written in C + +. It aims to provide scalable high-performance data storage solutions for Web applications. MongoDB is a product between relational database and non relational database. It is the most funct ...

1: Create a project django-admin startproject mysite Once created, the project directory structure is as follows: Manage. Py ----- Tools inside a Django project that can call Django shells, databases, etc. settings.py -- Contains default settings for the project, including database information, debug flags, and other work variables. ur ...

Multi table query, sub query, common function 1, Multi table query Multi table query: connect multiple tables through key fields with the same meaning in different tables to query the field information in different tables. Correspondence One to one: for example, the personnel information table and the personnel identity card correspon ...

Performance Monitoring Tools -- Connect MySQL Number of servers SHOW GLOBAL STATUS LIKE 'Connections'; -- MySQL Server online time SHOW GLOBAL STATUS LIKE 'Uptime'; -- Number of slow queries SHOW GLOBAL STATUS LIKE 'Slow_queries'; -- Select Number of rows returned by the query SHOW GLOBAL STATUS LIKE 'Innodb_rows_read'; -- implement INSERT Nu ...