MySQL

MySQL lock overview Compared to other databases, MySQL's locking mechanism is relatively simple, and its most notable feature is that different storage engines support different locking mechanisms. For example, the MyISAM and memory storage engines

I. Periodic checklists and Analysis tablesThe syntax for the parse table is as follows:ANALYZE [LOCAL | No_write_to_binlog] TABLE tbl_name [, Tbl_name] ...This statement is used to analyze and store the keyword distribution of the table, and the

In the actual business production system, MySQL from the library will sometimes change the main library according to the actual needs, when we need to clear out the library configuration of the master and slave informationLog on from the library to

1, what is the comparison to the set: Character Set (Collation,collate), a character set has more than one pair of sets.MySQLSS (auto_increment, char (ten)); VALUES (null,"a"); VALUES (null,"A"); VALUES (null,"B"); VALUES (null,"B"); --------------

apiVersion:v1kind:ReplicationControllermetadata: name:mysqlspec: 1 selector: app:mysql Template: metadata: Labels: app:mysql Spec: containers: - name:mysql

1. Install MySQL Database① download MySQL Packetwget http://mirrors.sohu.com/mysql/MySQL-5.6/mysql-5.6.35-linux-glibc2.5-x86_64.tar.gz② Extracting packages under/USR/LOCAL/SRCTar zxvf mysql-5.6.35-linux-glibc2.5-x86_64.tar.gz③ Rename the unpacked

Integrated operation:#登录数据库[Email protected] ~]# mysql-u root-p# Show Databasemysql> show databases;#进入testdata数据库mysql> use testdata;#显示当前数据库下的所有表Mysql> Show tables;#查询user表结构mysql> desc User;#查看usertable表内容Mysql> SELECT * from

A brief introduction: Today we talk about research and development normsTwo specifications1 table1 Choosing the right character set and storage engine recommended InnoDB UTF8MB42 table name do not include MySQL keyword, conform to naming convention3

A classic multi-column index case, such as the title: 假设某个表有一个联合索引（c1,c2,c3,c4）一下——只能使用该联合索引的 c1,c2,c3 部分Awhere c1=x and c2=x and c4>x and c3=xB where c1=x and c2=x and c4=x order by c3C where c1=x and c4= x group by c3,c2D where c1=x and c5=x

Environment: Ubuntu 16.04Installationsudo apt install Libmysqlclient-devsudo apt install mysql-serversudo apt install mysql-clientLoginMysql-u root-pExitQuit and \qShow all local databasesshow databases;Create a databaseCreate DATABASE

Import SQL files from the command line under Mac OS:1. Open the Mac terminal input mysql-h host-u-P--DEFAULT-CHARACTER-SET=UTF8MB4 Enter--DEFAULT-CHARACTER-SET=UTF8MB4 is added here to address special content in importing data, such as emoticons,

Several common installation methods of MySQL: RPM, source code, binary free compilation.Binary Compiler-Free installation stepsCD/USR/LOCAL/SRC wget http://mirrors.sohu.com/mysql/MySQL-5.6/mysql-5.6.35-linux-glibc2.5-x86_64.tar.gz tar ZXVF mysql-5.6

Before the MySQL installation has been written, there is no repetition of the work.Here I have prepared two virtual machines (192.168.40.128:mini1 192.168.40.130:mini2), respectively configured to create accounts in this environment Mini1,

#coding: Utf-8Import MySQLdbImport SysFrom mod_config Import *Reload (SYS)Sys.setdefaultencoding (' Utf-8 ')Class Mysqldbhelper:#获取数据库连接def getcon (self):TryConn=mysqldb.connect (Host=db_confg.host_sql (),User=db_confg.user_sql

1. First verify that the server is in a secure state, that is, no one can connect to the MySQL database arbitrarily.Because the MySQL database is completely password-protected during the reset of the root password of MySQLStatus, other users can

First step: Stop the Service/etc/init.d/mysqld stopStep two: Add parameters to start the serviceCd/application/mysql/bin/mysqld_safe--skip-grant-table--user=mysql--skip-networking &This mode: No password login network users can not log on only local

Required jar packages are commons-dbutils, COMMONS-DBCP, Commons-pool, Mysql-connector-javaThe local database.propertties is configured todriverclass=com.mysql.jdbc.Driverurl=jdbc:mysql://Localhost/mydatabase?useunicode=true

Have not understood the permissions of MySQL database beforeThe root user has the highest privileges, that is, the superuser, the root user can see all the contents of the database, and other users can only be the root user authorized to operate the

Today to help run the data found that SQL execution is very slow, well, according to the previous writing habits, and later with the architect to analyze the discussion, improved, the current record analysis is as followsFirst, the test table, SQL

MySQL installation (yum, binary, source)Directory　　1.1 Yum installation ... 2　　1.2 Binary Mount-mysql-5.7.17. 31.2.1 Preparation work ... 31.2.2 Unzip, move, authorize ... 31.2.3 MySQL configuration ... 31.2.4 Startup matters ... 4　　1.3 Source