MySQL

In the project, there is a need to split a table with a sheet that has been formed to preserve the large segment of the original table. A column that requires a child table is the primary key for the primary table.Database: MYSQLCase:Main Table:

Download the corresponding packagewget Https://cdn.mysql.com//Downloads/MySQL-5.7/mysql-5.7.22-linux-glibc2.12-x86_64.tarBack up the database (backup MySQL at least)Innobackupex-uxbackup-u root-p ocm123--no-timestamp/data/backup/Manually in the

1, MySQL master-slave introduction2. Environment Construction2. Master-Slave Preparation:Modify master configuration file:vim/etc/my.cnfAdd to:server_id = # # #Log_bin = Diy_nameThen save restart:/etc/init.d/mysqld restartBackup and recovery of data:

Database is a very important part of information system, it is very important to manage it reasonably and efficiently. It is common for administrators to create different administrative accounts, and then give different permissions to these accounts

MySQL Rights ManagementPermission categories:Management classProgram ClassDatabase levelTable levelField levelMySQL User and Rights ManagementManagement classes:CREATE Temporary TABLESCREATE USERFILESUPERSHOW DATABASESRELOADSHUTDOWNREPLICATION

Scene:When writing data in bulk, MySQL server has gone awayWorkaround:Set the Max_allowed_packet parameter a little larger in My.ini　　　Show global variables like ' max_allowed_packet ';　　The above workaround does not solve the problem, other reasons

#1, view table capacity spaceSELECTTable_schema,table_name,table_rows,ROUND(Data_length/1024x768/1024x768/1024x768) as 'data_size (G)',ROUND(Index_length/1024x768/1024x768/1024x768) as 'index_size (G)',ROUND(Data_free/1024x768/1024x768/1024x768) as '

CentOS system has an abnormal shutdown after the start of MySQL has been error#/etc/init.d/mysqld startStarting MySQL. error! The server quit without updating PID file (/data/mysql/linux-01.pid).View the error log as follows[Email protected] ~]#

IntroductionEngaged in MYSQL-DBA this is also a few years, want to say to the new person, in the analysis of deadlock problem should also consider that there is a "concept" called the request queue. ReasonThis is not because the novice does not know,

MySQL index types and principles:1 Normal index There is no limit to the most basic index2 unique indexed index column values must be unique but allow null values3 The primary key index is unique and does not allow the creation of a primary key

Environment:Centos 6.7, MySQL 5.7, Zabbix 3.2Background:The Zabbix server's MySQL data directory has insufficient partition space and needs to be migrated to another partition. Look at the online articles are quite simple, in broad daylight to

1.value and Values DifferencesThere is no grammatical difference between the two, the difference is only the execution time.After testing, you can find that the values insert a single line faster, and value inserts multiple lines faster.The 2.insert

First open the split color source build Database (Linux): Service MySQL start (Shut down database service MySQL stop)Enterprise: 217 1793 408Window under: net start MySQLThen enter the password: mysql-uroot-p passwordStart operation after entering

Cd/etc/mysql/mysql.conf.dsudo vi mysqld.cnfAdd the last sentence skip-name-resolve, as follows:[Mysqld]## * Basic Settings#user = MySQLPid-file =/var/run/mysqld/mysqld.pidSocket =/var/run/mysqld/mysqld.sockPort = 3306Basedir =/usrDataDir

Install MySQL using brew installation MySQL.Under console input MySQL, press TAB twicemysql mysql_upgrade mysqldumpslowmysql.server mysqladmin mysqlimportmysql_client_test

Two days on the internet did not find a useful article, their own research Sparkr official API document, finally found the implementation of the interfaceI use the R language to load the Sparkr library, of course, you can also directly use the

First, install CentOS 6# wget http://repo.mysql.com/mysql57-community-release-el6.rpm && RPM-IVH mysql57-community-release-el6.rpm # yum Install-y mysql-community-serverNote: http://repo.mysql.com This site is the site where the RPM source is placed

Installation brief for MySQL environment under Window:MySQL is the most popular relational database management system, and in Web applications MySQL is one of the best RDBMS (relational database Management system: relational databases Management

Introduction: MySQL's master-slave synchronization is an asynchronous replication process that replicates from one master to another slave. The entire replication process between Master and Slave is done primarily by three threads, of which

Introduction: mysqlbinlog_back.py is a tool that reads the mysqld binlog of the row format online and then generates a reverse SQL statement.It is generally used for data recovery purposes. The so-called reverse SQL statement is if INSERT,