MySQL

MYSQL (iii)The previous chapter to everyone said is the database view, stored procedures and so on, this chapter is mainly about indexing, as well as indexing considerations, if you want to see the previous article, the URL is as follows:

This part is the simplest and the most troublesome. Simple is because actually only includes adding and removing the four parts of the plug. In general, it is not troublesome to add data, delete data, modify data or query data. Who wouldn't? Before

MyISAM engine has three files. FRM Storage Table Structure. MYD Storing Data. MYI Storage IndexWhen you copy a table, the three files are copied to the specified directory at the same time.Exception handling:1. incorrect information in file '

The profiling of MySQL optimization toolAfter using the slow query log to parse out the slow query statement, analyze the performance of the statement with profiling after optimization.View slow query settingsMysql> Show variables like "%slow%";+----

1. Select the most applicable field propertiesMySQL is good at supporting large data volumes, but in general, the smaller the tables in the database, the faster queries are executed on it. Therefore, in order to achieve better performance when

http://downloads.mysql.com/archives/community/1: Add Environment variablesAdd MySQL's extracted bin directory to the PATH environment variable2: Modify or add My-default.ini[Mysqld]Basedir = D:\mysql-5.6.24DataDir = D:\mysql-5.6.24\data3: Go to the

I am a living example, the University of Instrumentation major, 12 after graduating the first job is a circuit board test. Because the project is exposed to the database of things, purely when the advanced point of the Excel table with.At that time

Student (id,sname,age,sex) Student tableCourse (id,cname,t_id) timetableSC (s_id,c_id,score) score tableTeacher (id,tname) Teacher tableProblem:1. Check the number of all students with "001" courses that are higher than the "002" course;Select Aa.id

Windows environment configuration MySQL ClusterFirst, Cluster environment Construction1. mysql Cluster (mysql Cluster 7.5.4) file: http://dev.mysql.com/downloads/cluster/2, prepare three servers (virtual machine, I use Windows Server R2 Enterprise),

What is a transaction: A popular explanation is a complete set of operations on a database that contains one or more operations in a complete set of operations. It's too low to explain it. Official: A transaction is a complete logical unit executed

1. LockWhy do I need a lock? Because the database wants to solve concurrency control problems. At the same time, there may be multiple clients working on the same row of records in the table, such as some reading the row data, and other attempts to

Query time-out: Long_query_timeStart slow scan log: Log_slow_queries={yes|no}Start the slow scan log: Slow_query_logLog record file: Slow_query_log_file [= file_name]MySQL if the Slow_query_log=on option is enabled, queries that execute longer than

Web page today to submit content to the database, found that the error, has not been submitted, the number of the next reason to find the data can not be written in! The first reaction, restart the MySQL database, has been executing, can not stop

Sign: Environment configured with Wamp want to use CMD to connect to MySQL how to evenInto the D-disk directory (CD cannot be cut, just enter the disk multibyte colon return, then CD to the directory)MySQL database runs without MySQL and Performance_

Environment: Windows7 64-bit system, mysql-5.7.16-winx64.zip1. Download the required MySQL zip package on the MySQL official website, as I downloaded the mysql-5.7.16-winx64.zip;2, decompression to the local disk (such as D disk), the extracted

"Scene" MySQL version: Percona-server 5.6.23, related main parameters:server_id = 3306sync_binlog=1gtid_mod = onenforce-gtid-consistency = 1log-slave-updates = 1relay-log-purge = 1relay_log_ recovery = 1master_info_repository = "Table"

How to change the mysql root Password in windows, mysqlroot It is very painful for the mysql database to forget the root password. This article describes how to solve the problem of forgetting the root password for the mysql server in windows. 1.

Solve the problem that mysql enters the password to crash, mysql enters the password to crash Before starting this article, make sure that your mysql password is correct. Let's take a look at it later. 1. First, go to cmd and switch to the MySQL

Detailed description of SQL statements in MySQL, detailed description of mysqlsql statements 1: Data Definition Language (DDL) Used to CREATE, modify, and delete data structures in a DATABASE, such as: 1. create database | drop database); 2: create

MySql query statement solves the problem of "This column is not included in the aggregate function or the groupby clause", the groupby clause   First, introduce the statement source. The table structure and data are as follows: Requirement: