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2021SC@SDUSC 1, Brief description Snapshot is a function supported by many storage systems and database systems. A snapshot is the image of a whole file system or a directory at a certain time. 2, Basic principle The simplest and crudest way to realize data file mirroring is to lock the copy (the reason for locking is that the data obtai ...

Summary of Li Hongyi's machine learning notes Course links Review The more complex the model, the lower the error on the testing data. error comes from two places: biasvariance f_star is f_ An estimate of hat, f_star may not be equal to f_hat, the distance may come from bias or variance Estimate the mean value of variab ...

When requested by the user's browser, django will first access the urlpatterns variable in the "ROOT_URLCONF" configuration list of the main route in the settings.py file. This variable is an array. There are many path functions in the array. In this path function, we will configure various routes and the name of the view function bou ...

Hello, I'm Zhang Jintao.You must be familiar with Shell. We usually think that Shell is the interface between us and the system, executing commands and returning output, such as bash, zsh, etc. Occasionally, some people confuse Shell with Terminal, but this has little to do with this article and will be omitted for the time being.As a programme ...

Django template system Official documents Common grammar Only two special symbols need to be remembered: {{   }} And {%%} Use {}} for variable related and {%%} for logic related. variable In Django's template language, use this syntax: {variable name}}. When the template engine encounters a variable, it will evaluate the variable and repl ...

Xiao Zhang, a student at school, sent CSDN for the first time, water phase I markdown! title # Primary title ## Secondary title ### Tertiary title #### Four level title ##### Five level title ###### Six level title typeface *tilt* **Bold** ***Italic bold*** _Italic text_ __Bold text__ ___Bold italic text___ ~~Delete line~~ ==Highlight = ...

abstractThis paper introduces k8s cluster management command Kubectl classification and command details.content1. kubectl command list classification(1) Basic Commands(Beginner)kubectl create adopt yaml/json File or standard input to create a resource object, which supports many subcommands, such as namespace pod deployment service etc. kubect ...

Author: Zhang Lianzhuang, PostgreSQL R & D EngineerHe has been engaged in the development of PostgreSQL database kernel for many years and has a very in-depth research on citus.Recovering lost data quickly is an important functional requirement of the database. It is generally recommended to use the tools recommended by the official. For op ...

Portal: Django+Vue project learning part 1: django background construction Django+Vue project learning part 2: vue project creation   Through the first two articles, the back-end and front-end shelves have been set up, and the back-end has written the method return data. This article will introduce in detail how to use axios to send get re ...

Key points of data mapping 3 - spaghetti map Broken line diagrams with too many lines usually become unreadable. This kind of diagram is generally called spaghetti diagram. Therefore, this kind of chart can hardly provide information about the data. Drawing example Let's take the evolution of female baby names in the United States from 1 ...