MySQL

First, compile and install MySQL before the preparatory workInstall the tools and libraries needed to compile the source code Yum install gcc gcc-c++ ncurses-devel perl Install CMake, download the source code from http://www.cmake.org

Problem Description: Monitor whether the MySQL service starts properly, start MySQL if it does not start properlyWays to judge MySQL:1) port judgment[Email protected] ~]# Netstat-lntup | grep 3306tcp 0 0 0.0.0.0:3306 0.0.0.0:* LISTEN 2288/mysqld2)

data type: Data type refers to the column, stored procedure parameters, expressions and local variables of the data characteristics, it determines the data storage format, represents the different information types. (such as integers, characters,

In the recent process of processing a batch of data, the fields from the table in the library need to be processed and exported to a new table. Only the amount of data in this table is nearly 500w.The problem with this amount of data is that it has

Installing navicat for MySQL software After you create a new database, create a new table 650) this.width=650; "Src=" https://s4.51cto.com/wyfs02/M00/9A/0E/wKiom1lQwm3yDZsbAAJMPgMZBuY583.png-wh_500x0-wm_ 3-wmp_4-s_2895721085.png "style="

Linux CentOS is generally used as a server, so the MySQL service should start automatically with the boot. Under normal circumstances, view the boot-start service using the Chkconfig command, as follows:#chkconfig--listActual use such as:You can see

1. Create a role for MySQL user backup, and grant the role Select, RELOAD, SHOW DATABASES, LOCK tables and other permissions.' Backuper '@'localhost'********'0 Rows affected (0.00 sec) MySQL> Grant SELECT, RELOAD, SHOW DATABASES, LOCK TABLES on *. *

I. Overview1. Definition　　　　2, the Classification of locks① from the type of data operation (read \ Write)Read lock (Shared lock): For the same data, multiple read operations can be performed simultaneously without affecting each other.Write lock

1. Download the ZIP installation package (second: Windows (x86, 64-bit), zip Archive) on the MySQL website http://dev.mysql.com/downloads/mysql/.2. After the download is complete, unzip it and place it in the directory you want to install.Example: D:

Upload files and unzip them[Email protected] ~]# cd/usr/local/ls mysql*mysql-5.7. 9-LINUX-GLIBC2. 5-x86_64. Tar tar zxvf mysql-5.7. 9-LINUX-GLIBC2. 5-x86_64. tar. gzCreate a soft connection after the decompression is complete[Email protected] local]

Software downloadTake CentOS 64-bit, mysql5.5 as an example.Download mysql5.5 website:http://dev.mysql.com/downloads/mysql/5.5.html#downloadsDownload the three files that the arrows refer toUninstall the MySQL that is already installed1. Find out if

Check background to get front page data Print to console console no garbled: Tomcat configuration no problem;Check MySQL database encoding settings: Character set: UTF8--UTF-8 Unicode, collation: Utf8_general_ci is correct, the database can be saved

MySQL5.6 Master-slave replicationFive steps to complete MySQL master-slave replication1./ETC/MY.CNF configuration of master and slave server, set unique ID to enable binary log.2. Create a master-slave copy of the account and authorize replication

Similar to other Linux versions!!! Modify MySQL Login settings Vim/etc/my.cnfFor example:[Mysqld]Datadir=/var/lib/mysqlSocket=/var/lib/mysql/mysql.sockSkip-grant-tablesAdd this lineSave and exit. 2. Restart MysqldService Mysqld Restart

Configuration file: LINUX:/ETC/MY.CNF default configuration file:/usr/share/mysql/my-default.cnf Windows:my.ini Main log files: Binary log log-bin: master-slave replication. Error log Log-error: The default is off,

First step: Download Https://dev.mysql.com/downloadsSign up for an Oracle account, occasionally you can use it, and get used to downloading it on the website.Choose version 5.7.18 hereThe latest version of the installation and the previous

1. Background* MySQL is a relational database management system developed by the Swedish MySQL AB company and currently belongs to Oracle products. MySQL is one of the most popular relational database management systems, and MySQL is the best RDBMS (

Common data types in MySQLone, character type①char (n): fixed N-character length string, if the length is not enough automatic space to be padded; Range of N 0~255②varchar (N): Storing variable-length strings, most commonly③text: Storing

Common data types in MySQLone, character type①char (n): fixed N-character length string, if the length is not enough automatic space to be padded; Range of N 0~255②varchar (N): Storing variable-length strings, most commonly③text: Storing

MySQL (2) -- transactions and views; mysql -- transaction views I. Transactions 1. Submit 2. rollback 3. ACID properties Ii. View 1. Create a view 2. delete a view 3. Update the view 4. Use View Iii. subquery