Programmer Group

In a real project, Mycat services also need to consider high availability. If the server Mycat is on is down, or if the Mycat service fails, it needs a standby machine to provide services and the Mycat cluster needs to be considered.Highly available options:We can use HAProxy+Keepalived with two Mycats to build Mycat clusters for high availabi ...

Machine information Machine IP Installation services Exposed port 192.168.177.128 mycat service External exposure port 8066 192.168.177.131 mysql1 External exposure port 3306 192.168.177.132 mysql2 External exposure port 3306 1. Install mycat 1.1 download the installation package (it is r ...

1. Introduction It was introduced in March R2DBC , which is an asynchronous, non blocking relational database connection specification. Although some NoSQL database vendors provide reactive database clients for their databases, migration to NoSQL is not an ideal choice for most projects. This promotes the birth of a general responsive relation ...

catalog 1. Function introduction and display (multi figure warning) 2. Code design 1 database 2 login interface and verification 3 main interface 4 change of information 5 information display Tip: this semester, Java class is going to do a project of employee management system. When we first hea ...

Experiment 1 install OpenShift 1.1 preparation [student@workstation ~]$ lab review-install setup 1.2 configuration planning OpenShift cluster has three nodes: master.lab.example.com: the OpenShift master node is a node that cannot be scheduled for pod. node1.lab.example.com : an OpenShift node that can run applications and infrastructure pod s ...

1. Preface One to many paging of MySQL data is a very common requirement. For example, we need to query the product and the image information of the product. But many people will encounter the mistake of pagination here and get incorrect results. Let's analyze and solve this problem today. 2. Problem analysis First, we create a simple product ...

Compound query The query of mysql table mentioned before is to query a table, but it is not enough in the actual development. select * from where (sal>500 or job='MANAGER')and eame like 'J%' Sort by department number in ascending order and employee's salary in descending order select * from EMP ro ...

Today, let's talk about the problem-solving methods of dfs. These methods are all the experiences after summing up, which are worth learning. Looking at dfs from binary tree In fact, the idea of binary tree is very simple. When we just started to learn binary tree, the most common way to do binary tree traversal is recursive traversal. In fact, ...

Delete, batch delete, add and modify SSM + Layui tables, pagination Delete (batch delete) increase Form validation method 1 Form submitted twice paging Form validation (using form.verify Combined with ajax) Modify and edit summary Delete (batch delete) This problem was encountered during the c ...

1. Environment OS environment: Linux db01 2.6.32-431.el6.i686 MySQL version: mysql-5.5.44 MySQL installation path: /usr/local/mysql MySQL data path: /data MySQL port: 3506 3507 2. Preparations 1. Dependent Package Installation yum install ncurses-devel libaio-devel gcc gcc-c++ bison -y 2. Install compiler ...