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1, Ansible installation Environmental preparation Management end: CentOS 7-2 192.168.18.147Managed end 1: CentOS 7-3 192.168.18.128Managed end 2: CentOS 7-4 192.168.18.148 Management side: [root@localhost ~]# systemctl stop firewalld.service [root@localhost ~]# setenforce 0 [root@localhost ~]# yum install epel-release -y [root@localhost ~]# ...

Transaction Delivery Properties for the 200202-SpringBoot series of tutorials For mysql, there may be several main points of knowledge about transactions at the isolation level; in the Spring system, there is also a transfer property of knowledge point transactions that is equally important when using transactions. This article will focus on ...

[Problem Description] Queries_per_sec (QPS) is two important performance counter metrics for databases.We often require development to inform this parameter to evaluate a load on the database.The following code connects to the server to make a simple query: using (MySqlConnection conn = new MySqlConnection()) { conn.ConnectionString = "Database ...

background The programmatic transaction management based on PlatformTransactionManater implemented in the previous article belongs to a very low-level encapsulation. In fact, the original JDBC transaction operation is encapsulated as an interface and then implemented by a specific implementation class ...

With MSSQL2005, can I truncate a table with foreign key constraints if I truncate the subtable first (the table with the primary key of the FK relationship)? I know I can too Use DELETE without where clause, then RESEED identity (or) Delete FK, truncate the table, and recreate FK. I don't think I can use any of the above options ...

Introduction to MHA architecture MHA is the abbreviation of Master High Availability. It is a relatively mature solution for MySQL high availability at present. Its core is a set of scripts written in perl language. It is an excellent set of high availability software for failover and master-slave promotion in MySQL high availability environme ...

12:59:22, February 1, 2020 The epidemic continues, disrupting many of my plans It's also good to study at home     Introduction to JdbcTemplate Spring encapsulates the operation of database deeply on jdbc. With spring's injection function, DataSource can be registered in JdbcTemplate. The Jdbc ...

Prepare four virtual machines Virtual Machine Installation 1.Create a new virtual machine 2.Click on Typical Installation(Recommend) 3.Select Chinese and click on your own partition # Partition Configuration (JD Usage) /boot 200M swap 512M # Not enough native memory, swap / # root directory 4.Configu ...

I've learned Spring Boot these days, and I want to record it for review in the future. Spring Boot greatly simplifies the complexity of XML configuration in the past. A Web project can be built with a few simple lines of configuration, which greatly saves development time. Environmental preparation Eclipse JDK 1.7 Maven M ...

Preface Before learning to operate MYSQL database with JAVA program, we need to download and configure it Eclipse and jdk1.8 , and the tools most needed this time: MySQL database and JDBC driver Download driver jdbc 8.0.11 download website: https://dev.mysql.com/downloads/connector/j/ Load driver Open eclipse and righ ...