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
4.2.2 description of common parameters
4.3 best practices
4.4 troubleshooting of common problems
Posted by paran0id Dan on Sun, 23 Feb 2020 02:12:25 -0800
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:
redis atomic self increasing
zookeeper node directo ...
Posted by Bleej on Sun, 23 Feb 2020 02:06:09 -0800
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()
Posted by 0riole on Sun, 23 Feb 2020 00:38:50 -0800
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:
Cid (customer id)
Ctime (t ...
Posted by davidska on Sat, 22 Feb 2020 23:32:13 -0800
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
Chapter 3 Using MySQL
Chapter 3 Using MySQL
Understanding databases and tables
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
[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
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
What is ELK?
ELK is a complete solution, which is the acronym of three software products
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
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