MySQL master slave -- data verification

Article directory 4. PT table checksum to verify master-slave data 4.0 references and installation 4.1. Pt table checksum verification principle 4.2 notes and common parameters 4.2.1 precautions 4.2.2 description of common parameters 4.3 best practices 4.4 troubleshooting of common problems 4.4.1, ...

Posted by paran0id Dan on Sun, 23 Feb 2020 02:12:25 -0800

A global unique id algorithm of 1 million generated per second by self-study

background The System tps is 3000, distributed deployment is adopted, and the business order number needs to be globally unique, such as order number. There are many common distributed global id schemes on the Internet, including the following: UUID redis atomic self increasing zookeeper node directo ...

Posted by Bleej on Sun, 23 Feb 2020 02:06:09 -0800

persepolis in open source code learning [2]

  1, Download Interface   1. Main interface download display MainWindow first initializes aria and starts aria2. The startup method is in download.py.  # start aria2         start_aria = StartAria2Thread()         self.threadPool.append(start_aria)         self.threadPool[0].start()         sel ...

Posted by 0riole on Sun, 23 Feb 2020 00:38:50 -0800

Query the bank teller's records of handling business within half an hour

Find out the bank teller's account opening records within half an hour. See if there are 3 or more accounts opened within half an hour. A table is given, in which is the operation record of a teller. The structure of the table records is as follows: field data type Cid (customer id) int Ctime (t ...

Posted by davidska on Sat, 22 Feb 2020 23:32:13 -0800

14. The use of listener in SpringBoot

1.1 introduction to monitor What is a web listener? A web listener is a special class in a Servlet that helps developers listen to specific events in the web, such as ServletContext, Httpsession, creation and destruction of ServletRequest, creation, destruction and modification of variables can be added before and after certain actions to real ...

Posted by avario on Sat, 22 Feb 2020 21:52:50 -0800

[MySQL] Use MySQL (connect, select database, display database and table information)

Chapter 3 Using MySQL Article Directory Chapter 3 Using MySQL Connect Select Database Understanding databases and tables Summary Simple Records - MySQL will always - [English]Ben Forta You'll learn how to connect to and log in to MySQL, how to execute MySQL statements, and how to get information ...

Posted by TravisJRyan on Sat, 22 Feb 2020 18:48:14 -0800

Insert data of SQL bit by bit series

[SQL from bit by bit Analysis series articles] is a bit by bit summary in actual development, from the simplest SQL query to comprehensive analysis query When analyzing SQL, related operations in mybatis and Hibernate will also be analyzedClick to view details This section describes inserting data in ...

Posted by Paul1893 on Sat, 22 Feb 2020 09:04:51 -0800

Deploy Ethereum smart contract (Hello World)

Ethereum is a public blockchain platform that provides a smart contract function. To develop an application on Ethereum, you need to install Geth based on Go language on its client. The official website is: https://github.com/ethereum/go-ethereum. 1. Enter the command line window 2. Enter in the command line window geth --datadir "E:\geth ...

Posted by stockton on Sat, 22 Feb 2020 06:03:32 -0800

Distributed ELK platform

What is ELK? ELK is a complete solution, which is the acronym of three software products ELK represents Elasticsearch: responsible for log retrieval and storage Logstash: responsible for the collection, analysis and processing of logs Kibana: responsible for the visualization of logs These three k ...

Posted by arjuna on Sat, 22 Feb 2020 03:03:17 -0800

Section 9: JWT introduction and security verification based on JWT with JS+WebApi as an example

I. Introduction 1. background There are many problems in traditional Session based verification, such as Session expiration, excessive server overhead, inability to deploy in a distributed way, and unsuitable for projects with front-end and back-end separation. Traditional token based verification ...

Posted by twmcmahan on Sat, 22 Feb 2020 02:59:29 -0800