Greenplum installation and deployment

1. Turn off the firewall and turn off selinux Close the firewall (three) Temporarily closed: systemctl stop firewalld Firewall on and off: systemctl disable firewalld View status: systemctl status firewalld 2. Close selinux (three sets) Permanent shutdown: edit /etc/selinux/config Change SELINUX=enforcing in the text to SELINUX=di ...

Posted by lindm on Thu, 09 Feb 2023 09:21:19 +0300

Prosperity, democracy and harmony

Day04 structure sequential structure The basic structure of JAVA is a sequential structure, unless otherwise specified, it is executed sentence by sentence in order. The sequential structure is also the simplest algorithmic structure. Between statements and between boxes, it is performed in order from top to bottom. It is composed of a n ...

Posted by mark bowen on Wed, 08 Feb 2023 00:07:40 +0300

Exceptions in Python

1. Two types of errors usually encountered in programming One type is grammatical errors, that is, writing codes that do not follow the syntax specified by Python. This is also the most common mistake for beginners, such as: >>> print("I love FishC.") SyntaxError: invalid character '"' (U+201C) Another class of errors is not due to ...

Posted by fourlincoln10 on Tue, 07 Feb 2023 15:01:30 +0300

Introduction to BOM and DOM of js

Bom Browser Object Model BOM is the abbreviation mode of Borwser Object Model, which provides a whole set of methods for operating the browser, and can access and operate the browser window. Using the BOM, developers can move windows, change text in the status bar, and perform other actions not directly related to page content. The Browser Obj ...

Posted by jwright on Mon, 06 Feb 2023 23:32:38 +0300

ATT&CK Combat Series-Red Team Combat

The second round of the Red Sun Shooting Range, I am not very proficient in the intranet, so I used it to record the process.Shooting range download addresshttp://vulnstack.qiyuanxuetang.net/vuln/detail/3/But the Baidu cloud link seems to be G, and a wave of online searches found my own Baidu network disk.Link: https://pan.baidu.com/s/16G9Tim03 ...

Posted by Flare Boards on Mon, 06 Feb 2023 12:41:17 +0300

Improve your awareness of the implementation details of the Promise.all() and Promise.race() functions in ES6

Table of contents 0.ES6 Promise.all() and Promise.race() functions in ES6 Added: ES6 Promise.race and Promise.all methods 1. Use of Pomise.all 2. The use of Promise.race 0.ES6 ES6 (ECMAScript 6) is the next generation standard of ECMAScript, its syntax is clearer, more readable, and more powerful. It provides new JS language feature ...

Posted by redbullmarky on Mon, 06 Feb 2023 09:57:38 +0300

Redis quick start

Table of contents 1. Get to know Redis first 1.1. Understanding NoSQL 1.1.1. Structured and unstructured 1.1.2. Association and non-association 1.1.3. Query method 1.1.4. Transactions 1.1.5. Summary 1.2. Understanding Redis 1.3. Install Redis 1.3.1. Dependent library 1.3.2. Upload the installation package and decompress it 1.3.3. St ...

Posted by Zssz on Mon, 06 Feb 2023 01:08:40 +0300

Numerical-analog factor analysis from scratch

Table of contents 1. Concept 1.1 Concept 1.2 Basic form · 1.3 Basic process 1.4 Comparison 1.5 Example of factor analysis: 1.6 Principle and properties 1.7 Two tests: ​Edit​Edit 2. Factor analysis based on Matlab 3.2 factoran() method 3. Factor analysis based on python 3.1 Step analysis 3.2 Code 4.3 Displaying Chinese in ...

Posted by new2code on Sun, 05 Feb 2023 13:28:59 +0300

Basic Graph Theory and Search

DFS (Depth First Search) basic concept Depth First Search An algorithm for traversing or searching a tree or graph. Traverse the nodes of the tree along the depth of the tree, searching the branches of the tree as deep as possible. When the edge of node v has been explored or the node does not meet the conditions during the search, the se ...

Posted by dennismcdougall on Sun, 05 Feb 2023 07:28:39 +0300

uniapp defines several ways of animation

The premise of this chapter is that everyone knows the basic properties of animation, such asanimation-name, animation-duration, animation-timing-function, animation-delay, animation-iteration-count, and animation-direction properties.learn more animation relevant content.Now make an animation effect of shaking left and right, the effect is as ...

Posted by saltious on Fri, 03 Feb 2023 14:21:35 +0300