Tag: maintenance

Graduation project nodejs appointment door-to-door maintenance service system

Development language: nodejs Frame:Express Database: MySQL5.7 Database tool: Navicat 11 Development software: Hbuilder/VS code Browser: edge / Google Table of Contents 1. Project Introduction 2. System functions 3. System project screenshots 3.1 Front page 3.2Backend management 4. Core code 4.1 Login related 4.2 File upload 4.3 Packaging 1. Project Introduction The scheduled door-to-door maintenance service […]

Maintenance of the note function – private mode (the initial interface does not display the first line of the note)

I found that Xiaomi Notes automatically displays the first line of each note. When we use sticky notes in our daily lives, we often record some important (such as account passwords) or relatively private content in them out of convenience. Therefore, I plan to add a privacy mode to it – not showing the first […]

Point divide and conquer maintenance dp + new dp ideas on connected blocks + root dp in terms of products: 0922T4

Connect the blocks first, so point divide and conquer is definitely Trick1 Connected block dp with selected roots There is a common idea for the connected block dp of the selected root. First find the dfn order of the original tree, and solve it according to the dfn orderreverse order Specifically, for the current point […]

Pandas one-click crawling and analysis of proxy IP and maintenance of proxy IP pool

1. Foreword Proxy IP is one of the necessary tools for crawlers to obtain data now. It can help us avoid some anti-crawling measures, such as IP blocking, verification codes, etc. At the same time, we can also use proxy IP to implement some multi-threaded or distributed crawler functions to improve crawler efficiency. However, obtaining […]

[Comprehensive explanation of Linux commands] 125. Hard disk maintenance and tuning: Use of fsck and hdparm commands

Article directory fsck Additional information grammar Options parameter Example hdparm Additional information grammar Options parameter Example Learn `python` from scratch fsck Checks and attempts to repair errors in the file system Supplementary instructions The fsck command is used to check and attempt to repair errors in the file system. When an error occurs in the […]

PostgreSQL streaming replication setup and maintenance

Article directory Preface 1. Configure the environment 1.1 Environment introduction 1.2 Main library whitelist 1.3 Main library parameter configuration 2. Stream replication setup 2.1 Backup and restore 2.2 Create a replication user 2.3 Parameter modification 2.4 Start and check 2.5 Synchronous streaming replication 2.6 Synchronous replication levels 3. Streaming replication monitoring 3.1 Role judgment 3.2 […]

Redis cluster mode deployment and maintenance

redis cluster mode deployment and maintenance 1. System resource and component planning 2. System software installation and setting 3. Build a redis-cluster cluster 1. Install stand-alone redis 2.redis configuration system service 3. Create a redis-cluster cluster 4. Redis-cluster cluster fault simulation Close the redis service Close the main redis service Remove a single redis service […]

Linux permission maintenance – Strace monitoring & Alias alias & Cron timing task

Linux Permission Maintenance-Strace Monitoring & amp;Alias Alias & amp;Cron Timing Task 1 Introduction 2. Hiding techniques 2.1. Time forgery 2.1.1. Modification time 2.2. Hidden files 2.3. chattr command 2.3.1. Command Reference 2.3.2. Attribute addition 2.3.3. Attribute cancellation 2.4. History commands 2.4.1. Hidden commands 2.5. Clear login log 2.5.1. Clear login success log 2.5.2. Clear login […]

String hashing (segment tree maintenance)

Sample question: https://acm.sdut.edu.cn/onlinejudge3/problems/4928ui The first way: This approach is the same as the basic idea of normal string hashing, h[r]=h[l-1]*p[r-l + 1]; Here we are left high and right low, so hash[ l ]=hash[ l ]*p[ r.len ] + hash[ r ]; And note that the query must recurse the right subtree first, so as […]