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Master-slave replication: in short, it means that after the master node adds, deletes and modifies the data, it will be synchronized to the slave database. It can easily realize multiple automatic backup of data and expand the database. Multiple data backups can not only strengthen the security of data, but also further improve the load perform ...

introduction Database backup is an important means to recover important data in time and prevent data loss in case of data loss. A reasonable database backup scheme can effectively recover data in case of data loss, and it also needs to consider the difficulty of technical implementation and effective utilization of resources. 1, MySQL da ...

1, Zhixuan collection novel crawling and analysis software based on JAVA Abstract With the development of network, there are more and more electronic novels. It has become a big problem to quickly and effectively obtain effective information from a large number of novels. Java is one of the more popular languages at present. It is necessary t ...

MySQL and database series article directory Classification of process control structure Classification: Sequential structure: the program is executed from top to bottom;Branch structure: the program selects one of two or more paths to execute;Loop structure: the program repeatedly executes a piece of code on the basis of meeting ce ...

nacos preparation 1. Configure java environment variables 2. Download and install nacos Download URL https://github.com/alibaba/nacos/releases Select the corresponding version 3. Decompress nacos be careful: The path should not have Chinese and spacesMake sure your MySQL version is above 5.7 (MariaDB above 10.5) 4. Add the foll ...

    I have developed a stock intelligent analysis software with powerful functions. If you need to click the following link to get it: https://www.cnblogs.com/bclshuai/p/11380657.html Qt use database catalogue one        Development environment... 1 two        Configure work... 1 two ...

preface MySQL is a real multi-threaded and multi-user SQL database service. With its high performance, high reliability and easy to use characteristics, MySQL has become the most popular open source database system in the server field. Master the basic operation of MySQL database, which must be mastered in operation and maintenance service ...

Control file is a fairly small file (up to 64M), which contains a directory of other files required by Oracle. The parameter file tells the location of the instance control file, and the control file tells the location of the example database and the online redo log file. The control file also tells Oracle about other things, such as informatio ...

Preface (add, delete, change, check) Queries to MySQL databases sometimes require processing of the result set of the query in addition to the basic query. Examples include taking only 10 pieces of data, sorting or grouping query results, and so on 1. Sort by keyword PS: Analogue to windows Task Manager You can use the SELECT stateme ...

A sentry alarm was received this week. The following SQL query timed out. select * from order_info where uid = 5837661 order by id asc limit 1 Execute show create table order_info   It is found that this table is actually indexed CREATE TABLE `order_info` (   `id` bigint(20) unsigned NOT NULL AUTO_INCREMENT,   `uid` int(11) unsigned,   ...