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:
EditEdit 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