MySQL

Design a system to save the table tennis tournament information!Requirements: Output The following information on the MySQL command line:650) this.width=650; "src=" http://s1.51cto.com/wyfs02/M00/76/D3/wKioL1ZdQR3TtEpeAABRgoDZ2u0976.jpg "title="

Friends who often use php+mysql are generally managed by phpMyAdmin to manage the database. Some daily debugging development work, the use of phpMyAdmin is really convenient. But when we need to export hundreds of trillion or even a few g of the

Original link: http://www.cnblogs.com/liongis/archive/2013/03/12/2956573.htmlBased on the previous article method, the batch command is added to enable automatic backup. It is only because the name of the backup file in the batch command is special

Before explaining the system database, let's look at the evolution of MySQL in data dictionaries:MySQL4.1 provides a information_schema data dictionary. It is easy to use SQL statements to retrieve the required system metadata from this point.MYSQL5.

These two days in the company's service-side project, found MySQL more practical 3 functions, here to share.1, Aes_encrypt function, the use of this function is to some of the high security requirements of the data using AES encryption, the syntax

Npm:The full name of NPM is the node Package Manager, which resembles Ruby's Gem,python pypl, setuptools,php pear, which is the packet manager in Nodejs. The Nodejs itself provides the basic modules. However, the development of practical

Reference address: Linux import, export mysql database commandFirst, export the database with the mysqldump command (note the installation path of MySQL, which is the path to this command):1. Export Data and table structure:Mysqldump-u user name-p

Reprinted from Sina BlogSeanFirst, the difference between UTF8 encoded utf8_bin,utf8_general_cs,utf8_general_ci in MySQLUtf8_general_ci is not case-sensitive, you should use this when registering your username and mailbox.Utf8_general_cs

Note the command-line action:Method 1: Use the Set password commandMysql-u Rootmysql> SET PASSWORD for ' root ' @ ' localhost ' = PASSWORD (' Newpass ');Method 2: Use Mysqladminmysqladmin-u root Password "Newpass"If Root has already set a password,

First, the operating system configuration optimization:1. On the network side, modify the/etc/sysctl.conf file, increase the number of TCP supported queues, reduce the resource recovery when disconnected.2. Limit the number of open files. Modify the/

One, max () optimizationMysql> explain select Max (payment_date) from payment;+----+-------------+---------+------+---------------+------+---------+------+-------+-------+| ID | Select_type | Table | Type | Possible_keys | Key | Key_len | Ref | Rows

Indexes and locks allow queries to lock fewer rows. If your query never accesses rows that you do not need access to, it will lock in fewer rows, which in two respects is good for performance. First, although the InnoDB is highly efficient and uses

MySQL has the following types of logs:Error log: Log-errQuery log: LogSlow query log: log-slow-queriesUpdate log: Log-updateBinary log: Log-binTo generate the log in the/var/log directory (where the system log is stored, only the root account has

November 27, 2015, as Phper I began to fully study MySQL database.Basic syntax:1, connect the server:Mysql>mysql-h Host-u Root-pEnter password (local environment can not input-H host)2, show databases;Queries all databases on the server and displays3

Index purposeThe goal of the index is to improve the efficiency of the query, you can analogy dictionary, if you want to check the word "MySQL", we definitely need to locate the letter M, and then find the Y letter from the bottom, and then find the

Back-end distributed series: distributed storage-two-way synchronous replication of MySQL Databases The last article on MySQL replication focuses on the design points and constraints of the two-way synchronous replication architecture.Problems and

MySQL single-instance and multi-instance installation[Single instance installation] Description: Only one service is provided, and one port is sed-I 2 s/localhost. localdomain/mysql // etc/sysconfig/networkhostname mysqlyum-y install ncurses-devel

Mysql master/Master replication + keepalived high availability (using VIP to access the database prompts that connection is not allowed)ERROR 1130 (HY000): Host 'nginx-vip 'is not allowed to connect to this MySQL server mysql> grant all privileges

Tutorials on basic functions and triggers in the MySQL stored procedure, mysql Stored Procedure Common functions of MySQL stored procedures I. string typeCHARSET (str) // returns the string Character SetCONCAT (string2 [,...]) // connection

How to compile the Python script for MySQL rollback, mysqlpython During database operations, it is inevitable that the database will be mistakenly operated due to the "carelessness". If you need to recover quickly, it is unlikely that the database