MySQL

--View the SQL statement that created the databaseShow CREATE Database mydb;--View the character sets supported by the currently installed MySQL.Show CharSet;--View MySQL database server and database character setShow variables like '%char% ';--View

The main purpose of the design index is to help us get the results of the query quickly, whereas a like query starting with% cannot use the B-tree index.Considering that the InnoDB tables are clustered tables (similar to the Index organization table

#mysql主从服务器mysql-bin.003673 | 106Viewing the error logShow variables like '%log_error% ';Replicate-do-table=testmysqlChange Master to master_host= ' 182.61.28.4 ', master_user= ' Mysync ',Master_password= ' 123456 ', master_log_file= ' mysql-bin.0036

Haha can only blame oneself too food haIt's not long since I contacted this MySQL.Mysql-u root-p when landing MySQL with a terminal todayAnd then you want to see your own database.I use the MySQL client is navicat for MySQL I look at the client

Nonsense not to say, directly open dry:1. Installation Environment:Yum-y install libevent glib2 lua gcc gcc-c++ autoconf mysql-devel libtool pkgconfig ncurses ncurses-devel libevent-devel2. Download the file:wget

Named Directory + file nameInset into#-*-Coding:utf-8-*-#!/usr/bin/env python############################################################# This Python script was used for MySQL database backup# using Mysqldump utility.################################

Environment: centos7.3 mysql5.7Main mysql:192.168.1.71From mysql:192.168.1.72Download the MYSQL5.7 RPM package on both servers in order to install it sequentiallyRPM-IVH mysql-community-common-5.7.22-1.el7.x86_64.rpmRPM-IVH mysql-community-libs-5.7.2

MAMP when I clicked Start Server,Found MySQL server not openHttp://images.cnblogs.com/cnblogs_com/lwwen/1231721/o_111111111.pngJust like the photos in the link.Google search on the MAMP below is the ib_logfile* #的文件都删除 is/application/mamp/db/mysql56/

1. MYSQL Installation Download the latest installation package: According to the current system Win10 64-bit, select MySQL Community in MySQL on Windows (Installer & Tools), select the MySQL Installer to download, Note Download the full

1, serviceMySQL stop # mysql5.1 version is mysqld, and the service name of the mysql5.6 version of the binary package is MySQL.2, /etc/init.d/mysql start--skip-grant-tables3,MySQL> Now you can change the root password in MySQL.mysql> Update

Below to share under Linux How to modify the MySQL user (root) password, in two cases: the first when the original MySQL root password, the second case to forget the original MySQL root password.The modified users are listed as root.First, the root

single-table query 1, query all:SELECT * from table name;2. Query the selected field data:Select field name from table name;3, query the data under the specified conditions:Select field name from table name where condition (example id>3);4, after

we typically run into a business scenario like this:b host and C database in the same intranet, a host cannot directly access the C database, we can build the agent on the B host let a access C database, we use Haproxy to do this thingCENTOS7

For slow SQL optimizations, you can generally follow the following steps:1, turn on slow query log, set more than a few seconds for slow SQL, crawl slow SQL2, through explain to slow SQL analysis (focus)3, Show profile query SQL in the MySQL server

MySQL 8.0.11 has been released, heard the performance increase of twice times, today's own installation experience.1. Uninstall the old version of MySQLRpm-qa|grep MySQL or mairadbRpm-e mysql*/mariadb*RPM-E--nodeps mysql*/mariadb*2. Install

When using EXPLAIN to execute a plan, you will occasionally see such a description in Extra:WHEREconst tablesThe literal meaning is: After reading the const tables table, no matching rows are found.Let's try to reproduce the scenario with an example.

First, MySQL IntroductionWhen it comes to databases, we mostly think of relational databases, such as MySQL, Oracle, SQL Server, and so on, which are very easy to install on Windows, and if you want to install a database on Linux, I have to

Decide whether to build a table by checkingIf the table has not been established, execute the PTMT statement update and create the table in the database.If the table already exists, do not perform the table operation;Package Sqlcon;import java.sql.*;

In the development in order to make development more convenient, in the local configuration environment, you want to have direct access to the MySQL database on the server, more convenient management database,You need to remotely connect to the

Group_concat functionDefault "," mergeSelect p.id as Patent_id,p.application_no,p.name,p.inventer,group_concat(pi. ' name ') as Sys_inventer From ip_patentSplit with the specified symbolSelect p.id as