Programmer Group

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 ...

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 ...

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 ...

The previous several articles have prepared the database and data, and now they will be developed later. Some of them may be different from others on the Internet. I did it for the first time, and all the functions have been realized. This article is about development, registration and login. First, pas ...

Preface As mentioned in the previous article How MyBatis builds configuration classes Yes, I also said that MyBatis is mainly divided into two phases in the running process, the first is building, the second is executing, so this article will take you to see how MyBatis goes from building to executing our first SQL statement.This part of the co ...

At present, MHA (Master High Availability) is a relatively mature solution in the aspect of MySQL high availability. In the process of MySQL failover, MHA can automatically complete the database failover operation within 0-30 seconds, and in the process of failover, MHA can guarantee the consistency of data to the greatest extent, so as to ach ...

Author: ye Jinrong, co-founder of zhishutang, and co-founder of 3306pai community Preface What causes the util and iowait of disk I/O of online database server to keep soaring? 1. Problem description A friend Xiaoming's online database gave a serious alarm. The business side reported that writing data was blocked all the time. Many locks ro ...

1. About testing Recently oracle held a series of online sharing, one of the new features of 19c is automatic indexing. I tested it in docker and failed. [oracle@8aa96a41b58b ~]$ sqlplus / as sysdba SQL*Plus: Release 19.0.0.0.0 - Production on Thu Feb 20 09:44:52 2020 Version 19.3.0.0.0 SQL> EXEC DBMS_AUTO_INDEX.CONFIGURE('AUTO_INDEX_MODE ...

About the uniqueness of object naming in SQL Server database. For example, database objects such as tables, indexes, constraints, etc. sometimes, DBA s often need to create or rename objects when doing database maintenance. At this time, they will encounter a problem, the uniqueness of object naming. Although it's a small question, it's not cle ...

This article was written by Once, a member of Red Sun Security. If it is incorrect, it should be correct. Hello, we are the Red Sun Security-Web Security Attack and Defense Team.This project is a series of articles about Web security and includes an HTB range for you to practice with. We have given ...