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Operation database Operation database Several basic database operation commands: update user set password=password('123456')where user='root'; Change Password flush privileges; Refresh database show databases; Show all databases use dbname；Open a database show tables; show database mysql All tables in describe user; Display table mysql ...

JAVA program deployment preface Operating environment: Galaxy Kirin + Feiteng CPU Project framework: Springboot + Mybatis + Dameng database jdk1 eight The last one wrote the source code of the project, and this one mainly wrote the deployment of the project on the domestic operating system and the installation and creation of Dameng data ...

1, Environmental preparation before installation 1. Operating system: CentOS 7.6 (virtual machine, IP: 192.168.172.151) (1) Operating system turn off firewall: [root@local151 ~]# systemctl stop firewalld.service [root@local151 ~]# systemctl disable firewalld.service [root@local151 ~]# systemctl status firewalld.service ● firewalld.service - ...

1, Explain tool introduction Use the EXPLAIN keyword to simulate the optimizer to execute SQL statements and analyze the performance bottlenecks of your query statements or structures Add the explain keyword before the select statement. MySQL will set a flag on the query. Executing the query will return the information of the execution plan i ...

Account security: 1,User information file /etc/passwd # Format: account:password:UID:GID:GECOS:directory:shell # User name: Password: user ID: group ID: user description: Home Directory: shell after login root:x:::root:/root:/bin/bash # View logged in users: cat /etc/passwd | grep /bin/bash # View users with UID=0 awk -F: '$3==0{print $1}' / ...

New Oracle database instance without Linux interface according to https://blog.csdn.net/qq_24058757/article/details/88220437 Summarize and sort out your own new instance process after step operation Memory check Check the memory. There should be no problem. If the memory is small, pay attention to the mounting [oracle@oracledb ~]$ grep -i m ...

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This article is mainly a case review of the database. Students who don't understand the database can have a look. It's best to try it again. It will be helpful. Database Version (I) In order to review and consolidate the previous knowledge, I did this exercise, encountered problems and deepened my understanding. This article is suitable ...

Introduction: SearchIndex is the secondary index of Lindorm wide table, which is mainly used to help businesses realize rapid retrieval and analysis. This article introduces how to operate SearchIndex through a simple SQL interface.1, IntroductionThe cloud native multi-mode database Lindorm supports low-cost storage of massive data and flexible ...

Some time ago, I got the decoding of dat pictures in WeChat, and later some students asked how to decode the database.. Of course, after looking at it one after another, plus the messy things in hospital, it has not been handled. After handling it in the last few days, we found that the data format of the WeChat database is really troublesome.. ...