MySQL

Accidentally forgot the database password,At this point we just need to add in the database configuration fileSkip-grant-tablesThen restart the service, and then log in to the database without us entering the password.This time I successfully login

Server system Variables (System variable)The MySQL system variable (systems variables) refers to the various system variables of the MySQL instance, which are actually some system parameters that are used to initialize or set the database to occupy

One, MySQL adds a time interval for the date: Date_add ().1. Example:Set @dt = Now ();Select Date_add (@dt, Interval 1 day); -Plus 1 daysSelect Date_add (@dt, interval 1 hour); -Plus 1 hoursSelect Date_add (@dt, interval 1 minute); -Plus 1

Problem:Error log reported as error when importing mysqldump exported database2018-09-03t01:49:15.741378z 6 [ERROR] innodb:column table_name in table ' MySQL '. ' Innodb_table_stats ' was VARCHAR (597) not Null but should is VARCHAR (192) not NULL

Business Party request Weekly send a weekly report out, the past week of the online project details sent out, our monitoring with Zabbix, the past has been manually filled, very time-consuming and very unprofessional, so I spent a few months to

Syntax structure:[no_write_to_binlog | LOCAL] TABLE[, Tbl_name] ...Optimize table reorganizes the physical storage of tables data and indexes, reducing the IO efficiency when using storage space and improving access to tables. Optimize table

The data SQL CASE expression is a generic conditional expression that resembles a if/else statement in another language.Case if condition then resultWhen condition then result.............[When ...][ELSE result]ENDThe case clause can be used where

This article comes from NetEase cloud community.InnoDB is the most common storage engine for MySQL, and understanding the index of the InnoDB storage engine is of great benefit to daily work, and the index exists to speed up the retrieval of

The fifth chapter sort retrieves the dataThis chapter teaches you how to use the ORDER BY clause of a SELECT statement to sort the retrieved data as needed.5.1 Sorting DataAs described in the previous chapter, the following SQL statement returns a

Problem Description: The MySQL used is 5.1.37 version, with the Mysql-connector-java-5.0.4.jar version, the field defined in the Java file is a date type, the field type defined in MySQL is a datetime type,Try the following methods are unsuccessful,

MySQL high-availability cluster skill target Familiar with MMM high-availability architecture Familiarity with MHA high-availability architectures Learn to configure MMM high availability Learn to configure MHA high availability

MySQL compact version installs and avoids 1055 errors and msvcp120.dll lossThe installation of the MySQL compact version is quick and easy, with 5.7 and the latest version 8 installed in roughly the same way.You may encounter a 1055 error when using

Article reference address: https://www.cnblogs.com/Glory-D/p/7518541.html, https://www.cnblogs.com/zhchoutai/p/6929103.htmlMysql-u root-p + Enter-u followed by user name,-p means password login required, first access to MySQL with root userSuch

Purpose of the backup　　Data loss scenarios such as disaster recovery, hardware failure, software failure, natural disaster, hacker attacks, misoperation testing, etc.Backup Note points　Can tolerate the maximum amount of data lostHow long does it

MySQL modifies the Database Engine Replace the database engine in MySQL using: alter table mytable engine = InnoDB   MySQL foreign key Type Error Code 1005, SQL status hy000: can't create table '. /grasspubsys/# sql-5bc_3.frm '(errno: 150) This

Various joins in MySQL 1. Cartesian Product (cross join) In MySQL, you can think of cross join or omit cross as join, or use ',' For example Select * From Table1 cross join Table2 Select * From Table1 join Table2 Select * From Table1,

MySQL is a sophisticated SQLManagement system, although it is not an open source product, but in some cases you can use it freely. For UNIX and OS/2 platforms, MySQL is basically free of charge. In addition, MySQL is a real multi-user, multi-thread

Expected results: the data on a master MySQL server is changed, and the data on the slave server is automatically changed. Principle: The slave server registers an account on the master server and sends the binary log file generated by the addition,

First, start and stop the MySQL Service Net stop MySQL Net start MySQL Second, log on to MySQL Syntax: mysql-u user name-P User Password Enter the mysql-uroot-p command, press enter and prompt you to enter the password, enter 12345, and then press

MySQL has a lot of basic commands, and the show command is also one of them. In many users, the use of the show command is also prone to confusion. This article summarizes the many usage of the show command.1. Show tables or show tables from