MySQL

look for those installation tutorials on the Internet more than the version, as long as the version is not too old on the line.download MySQL 5.6.28 Universal version 64-bit binary plate, binary sedan equivalent to Windows installation package, can

1. Log in to the database.mysql-uroot-pxxxx-h127.0.0.1-p3306--prompt XXXPrompt xxx can change the prompt \d represents the full date; \d represents the current database; \h server name; \u the current user.2. DisplaySelect version (); Show

Problem Description: The MySQL database table query is usually paged through the Limit keyword, and when the data is not large enough, it can very quickly return data, but when the data reaches millions, the larger the current page number, the

Mysql Operation DaquanI. OverviewThe full name of the SQL (Structured query Language) language is the Structured Query language. The database management system manages the data in the database through the SQL language.The SQL language is divided

Both decimal and numeric.The decimal and numeric types are considered to be the same type in MySQL. They are used to hold values that must be of exact precision, such as currency data. When declaring columns of that type, you can (and usually want

The following are excerpts from the Code Audit: Enterprise Web code Security Architecture Book1.floor ()SELECT * FROM Test where id=1 and (select 1 from (SELECT COUNT (*), concat (User (), Floor (rand (0)) × from information_schema . Tables GROUP by

(1) Download MySQL on official website:http://dev.mysql.com/downloads/mysql/(2) After extracting, go to the directory, copy the My-default.ini file and rename it to My.iniOpen the My.ini to find the corresponding line and modify it:Basedir =

Here's a demonstration of the process of building a multi-master from MySQL 5.7:Lab Environment:master_1:192.168.10.128master_2:192.168.10.129slave_3:192.168.10.130First, the database that needs to be synchronized is exported on master_1 and master_2

in the MySQL Sub-Library table we are generally based on a large amount of time on the MySQL database an optimization approach, below I briefly introduce MySQL sub-table and the simple way of the library. 1, the sub-database is obvious, a main table

Get MySQL in JDBC we sometimes need to get the size of the table, which includes the number of rows and columns of the table, which we can get separately in the following ways:Suppose we get a ResultSet object RS, the operation is as follows:fetch

This is what I would do it. Create a class to do encryption/decryption:Class cipher{private $securekey; Private $iv _size; function __construct ($textkey) {$this->iv_size = mcrypt_get_iv_size (mcrypt_rijndael_128,

This article mainly introduced the MySQL performance optimization max_connections configuration parameter analysis, this article emphatically explained 3 kinds of configuration Max_connections parameter method, the need friend can refer to the MySQL

In the blog http://www.cnblogs.com/Mr-Cxy/p/5898839.html mentioned row to column,If you want to add a row of total data rows below this table how does the SQL code be implemented and the city descending total is placed on the bottom according to the

Directly on the method: first configure the CentOS firewall iptables rule: # vim /etc/sysconfig/iptables Add the following rules to them: -A INPUT -m state –state NEW -m tcp -p tcp –dport 22 -j ACCEPT -A INPUT -m state

Set primary-primary replication:1. Establish a user with copy permission on both servers;2. Modify the configuration file:# on the master server[Mysqld]Server-id = 10Log-bin = Mysql-binRelay-log = Relay-mysqlRelay-log-index =

Can MySQL use the index in a like query? Where do you use the index?When using like, if you use ' percent ', will you use the index?EXPLAIN  SELECT * from ' user ' WHERE username like '%ptd_% ';  The result above is a full table scan (type = =all)

Mysql remote access permission By default, MySQL does not have the permission to enable remote access. You need to manually enable the permission as follows: 1. log on through the command line. 2. mysql> update user set host = '%' where user =

How does mysql modify the table type (Table engine) and mysql engine? Read: http://www.manongjc.com/article/1205.html Recently, I encountered a problem about modifying the MySQL table type. Previously, when phpmyadmin managed the mysql database, the

MySQL MEB-based Backup Recovery and mysqlmeb backup MEB (MySQL Enterprise Backup) is a Backup tool provided in MySQL commercial edition and is a physical Backup tool. Like XtraBackup, mysqlbackup uses the following three steps: Backup (-- backup) =>

Summary of the basic usage of adding, deleting, modifying, and querying mysql, and summary of the usage of adding, deleting, and querying mysql Directory: 1. Create a database2. Create a data table3. view the table structure4. add, delete, modify,