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1. Brief introduction of the system Using C++ language, this paper designs and implements an inbound and outbound commodity management system suitable for supermarkets, which implements functions such as commodity purchase, sales, commodity classification, revenue management, order management, administrator and so on. 2. Systematic Hierarch ...

VUE learning document Review: 1. What is the relationship between ES6, ES and JS 2,var,let,const 3. String function indexOf lastIndexOf charAt substr substring concat includes startswith endswith The template string will be displayed in whatever format it is written in 4. Deconstruction expression: assign the value of the array ...

1. Use background Recently, the group wants to build a set of real-time data warehouse in the existing environment. After comprehensive analysis, doris will be used as the database of real-time data warehouse. The data sources include message data and business database data. 2. Data source access It's easy to say the message data. Whether pu ...

1. Concept of gtid Global transaction id, one transaction of Gtid corresponds to one id, and during master-slave synchronization, the transaction id submitted on each master generates a unique transaction id when copied to the cluster.Instead of using master log file and master log POS to start replication, Gtid is used to replace the trad ...

Indexes 1.1 what does database index do? Database index is actually to make data query faster /*Check the important things and say them three times*/ 1.2 what are the database indexes? 1. Clustered index (primary key index). In the database, all rows will be sorted according to the primary key index 2. Non clustered index: index ordinary ...

As the length of the last article is too long, I'll practice it alone. o by the way, it's better to use single quotation marks for the characters in mysql, otherwise an error may occur! Textbook exercises Suppose there is a database of students' course selection, which contains three relational patterns: student snosnamesexbirthspecialty201 ...

Master MySQL installation from the root, and so on. Installing other c/c + + software through source code on linux platform is similar. ​ one   Installation mode The installation package of linux is divided into RPM package, binary package and source package. Different installation methods have their own advantages and disadvantages. Compa ...

1, Test scheme Test in a virtual machine (first verify the scheme and configuration, and then deploy to K8S)Master1, port 3310, name mysqlm1, configuration file / opt/mysql/conf/mysqlm1.cnf, database directory / opt/mysql/m1databases, REPLICATION, user name m1slave, password 123456Master2, port 3311, name mysqlm1, configuration file / opt/ ...

GO language -- migrate from MySQL database to Amazon DynamoDB 1, Foreword The blogger is learning the Go language. It happens that the Leader asked to study whether the migration from MySQL database to DynamoDB can be realized by script This blog post is a simple migration implemented by bloggers using Go language, because the code is no ...

With the growth of data volume, the performance of a single database can no longer meet the requirements. Therefore, the method of database and table division was born to improve the access performance of RMDB. The problem caused by database division is that transactions cannot be controlled through a single DB connection (multiple database ...