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mysql data backup I summary The main purpose of backup is disaster recovery. Backup can also test applications, rollback data modification, query historical data, audit, etc. II Importance of data backup In the production environment, the security of data is very important, and any loss of data may have serious consequences. III Causes of ...

Background introduction In some cases, we are using Kubernetes as the cloud platform for business applications. We want to realize the blue-green deployment of applications to iterate the application version. lstio is too heavy and complex, and it is positioned in flow control and grid governance; Ingress nginx introduces Canary function in ve ...

1, Basic concepts of transaction 1. What is a transaction (1) Transaction is the most basic unit of database operation. Logically, a group of operations either succeed or fail if one fails (2) Typical scenario: bank transfer 2. Transactions have four characteristics (ACID) (1) Atomicity: to succeed, to fail, to fail (2) Consistency: the total a ...

STL Hey, c + + long time no see, meet you again familiar and strange. The feeling of practicing many brush questions fades a little, and you need to be familiar with the actual questions again. This article will be continuously updated Today, let's remedy the concept of STL in time to facilitate more efficient problem brushing in the future. ...

this this is a keyword of JavaScript language. It is an object automatically generated inside the function body when the function is running. It can only be used inside the function body. function test() { this.x = 1; } Multiple directions of this: In JavaScript, this is not fixed. It will change with the change of execution environmen ...

CSS: 1, Simple understanding CSS selector, beautify web pages (beautify text, shadow, hyperlink, list beautification, gradient), box model, web page animation. <style> h1{ color:red; } </style> Syntax: Selector{ Statement 1; Statement 2; } 3. Two ways of writing external styles Linked: <link rel="stylesheet" href="css/ ...

1, vector container 1.vector introduction Vector container is a dynamic array provided in the form of class template. Similar to array, the elements of vector are also stored in continuous space, which supports subscript access to elements. Different from array, the size of vector container can be changed dynamically, and the storage spac ...

1, Thread theory foundation Advantages of threads One of the reasons to use multithreading: Compared with the process, it is a very frugal way of multitasking. Under the Linux system, to start a new process, it must be allocated an independent address space, and a large number of data tables must be established to maintain its code segments, ...

1, Installing Nginx under Centos Reference documents If the machine installs Nginx for the first time, you need to set the software package warehouse of Nginx before installing Nginx, and then install and update Nginx through the warehouse Install some pre required configurations yum install yum-utils Set the yum warehouse in / etc / ...

1. Basic concepts Polymorphisms fall into two categories Static polymorphism: function overloading and operator overloading belong to static polymorphism and reuse functionsDynamic polymorphism: derived classes and virtual functions implement runtime polymorphism Difference between static polymorphism and dynamic polymorphism Statically poly ...