MySQL

Part I: Supplementary(1) The previous chapter adds:MySQL at boot time:1. Start the daemon daemon (mysqld) and generate worker threads (IO, W, R)2. Pre-allocated memory structure for MySQL processing data useWhat is an instance?MySQL background

Engaged in development for many years, in fact, MySQL and the installation of many times, but each need to search the online tutorial, toss half a day to fix, this time simply the whole process of recording down, in order to consult later.

MySQL Master-Slave introductionConfigure the PrimaryConfiguration fromTest Master-Slave synchronizationCommon faults in master-slave configuration1. Network reason: Check whether the network is OK, SELinux is off, Iptables is off2. Incorrect account

Creating a library: Create database test1 charset UTF8;View Gallery: show databases;View Genesis statement: Show CREATE DATABASE test1;Select Library: Use Test1Modify Library: Alter DATABASE test1 CharSet UTF8MB4;Delete Library: drop database

1. Basic ConceptsData table: A two-dimensional table consisting of rows and columns;Rows in a data table are usually called records or tuples;The columns in the data table are often called field latter properties;Primary key: Each record in the data

Lab Environment:CentOS 7.4MySQL Software: mysql-boost-5.7.20.tar.gz1. Install the Build toolYum-y install \ncurses \Ncurses-devel \Bison \Cmake\GCC \gcc-c++ \Make2. Unpacking the PackageTar XF mysql-boost-5.7.20.tar.gz3. Custom ConfigurationCD mysql-

Install the databases in Mysqlclientpip install Mysqlclientsttings first= { 'default': { 'ENGINE':'Django.db.backends.mysql',#or use Mysql.connector.django 'NAME':'Test', 'USER':'Test', 'PASSWORD':'test123',

How to build a MySQL database1) Uninstall the original MySQL this is the rpm way to install MySQL, so use rpm-e MySQL--nodeps to uninstall2) Open after mounting3) Mysql5.5 need to install CMake compile installation, so install CMake package firstTo

The two tables are the primary (check_drawings) from (check_drawings_img) relationship.Check_drawings, Main table data 3,591.SELECT COUNT (* from Check_drawings;--3591CHECK_DRAWINGS_IMG, from table data 107,203, the amount of data is not large, and

1. Create userCREATE user test@localhostby'123456'; #建立的用户名为test, users with a password of 123, #localhost限制在固定地址localhost登陆#创建远程连接用户 Create User by ' 123456 ';2. AuthorizationGRANT Privileges on to ' username '@'host'Description:

MySQL installation files are divided into two types, one in MSI format and one in ZIP format. If the MSI format can be directly clicked to install, follow the installation prompts it to continue to install, here is mainly about the zip format

——————————————————————First part: Character Set——————————————————————Show CharSet; ---View MySQL support character set1. Server-side(1) Instance levelVim MY.CNFCharacter-set-server=utf8(2) Library levelCreate Database Oldboy charset UTF8;Create

The code to save the crawled data to the MySQL database (already able to save the crawled data to a JSON file)(1) Edit pipeline.py file　　　　(2) Edit settings.py file　　　　　　　　Ii. problems with saving data to MySQL database(1) When the data stored in

The use and related problems of find_in_set in MYSQLQQ Group is discussed if you open the 12 classification in Category_ids, and the IDs in Category_ids are separated by commas.It must be impossible to use like.So I looked for a find_in_set function

Database name (already exists): TableCreate a new MySQL user and specify the database to allow remote accessMySQL User: TestMySQL User password: test666CREATE USER ' Test ' @ '% ' identified by ' test666 '* * to ' test ' @ '% '; GRANT SELECTFILE,

The way that the node callback function makes the database transaction seem to be not as simple as Java, PHP, the web to find some transaction processing package is not as simple as expected to write, or to encapsulate a bar.The general idea of

First, check the passwordThen you need to go into the/etc/mysql directory, execute sudo vi debian.cnf or sudo vimdebian.cnf to view the username and password inside,Then use the user name and password in this file to enter MySQL,If the user name in

Create a user and authorize---------------------------------------------------------Grant all privileges on * * to ' www ' @ ' localhost ' identified by ' 123456 '; #授权www, all operations, all table permissionsGrant all privileges on * * to '

MySQL connection pool and thread poolDifferenceConnection pooling is a client settingThe thread pool is the DB service-side settingThe role of connection poolingControl clients frequently connect to DB servers, and destroy connection threadsBenefits

1, backup MySQL data at 0 points per day;2, in order to save space, delete more than 3 months of all backup data;3, delete more than 7 days of backup data, retain 3 months of 10th number 20th number 30th of the backup data;#创建shell文件vim backup_mysql.