MySQL

I original article, reproduced please indicate the source.MySQL's memory management is large and advanced, which is described in the comments at the beginning of the mem0pool.c file, roughly divided into four parts, containing 9 chunks:Buffer

The first blog mood small excitement, do not know what effect, or directly write itRecently has been a problem around is the database after installation has been reported 1055Modify the various eventually did not solve, have to know please enlighten,

1. In cmd, go to MySQL to view the default encoding format:Mysql> Show variables like "%char%";If it's not UTF8 (because I'm using UTF8), turn off the MySQL service and add it in My.ini[Client]Default-character-set=utf8[Mysqld]Default-storage-engine=

Transferred from: http://blog.csdn.net/kqygww/article/details/8882990In MySQL, the constraint is stored in the table_constraints of the INFORMATION_SCHEMA database, and the constraint information can be queried by this table.The constraint mainly

A Mysql Binlog Format IntroductionMysql Binlog logs are available in three formats, statement,mixed, respectively, and row!1.Statement: Every SQL that modifies data is recorded in Binlog.Advantages: No need to record the change of each line, reduce

1. Use the index to traverse the table more quickly.The index established by default is a non-clustered index, but sometimes it is not optimal. Under a non-clustered index, the data is physically randomly stored on the data page. A reasonable index

Generally after Windows installed MySQL we will choose the MSI installation mode, but install the latest version of MySQL (mysql-installer-community-5.7.11.0.msi) found that MySQL default is installed on the C drive, this absolutely can not endure,

MySQL provides synchronization of the database, which is very helpful for us to realize database redundancy, backup, recovery, load balancing and so on. This article describes common methods for synchronizing settings.First, prepare the

Summary of recently encountered issues:Do not have the same files as the project name in 1.django Engineering. Will cause the import settings.py file to fail.2.django CSRF issue, when sending a POST request, it is required to send CSRF token at the

When using Php+mysql, have you ever encountered a problem with garbled characters? How did you solve this problem? Here's a way to solve it.After mysql_connect add a set NAMES UTF8, you can make the database of UTF8 de garbled, for GBK database use

First, view the supported storage enginesSHOW ENGINES \g;OrSHOW VARIABLES like ' have% ';Second, the installation version of MySQL default engine is InnoDB, free install version of the default engine is MyISAMThird, query the default storage

MySQL Key and indexThe relational database relies on the primary key, which is the cornerstone of the database physical pattern. There are only two uses of the primary key at the physical level:Uniquely identifies a row.As an object that can be

There are some pitfalls in MySQL schema design, and this is just about the problem with MySQL implementation.1 Too many columnsThe MySQL storage engine communicates with the server layer by copying the data in a row-buffered format and then decoding

#建表#创建表CLASSCREATE Table Classes (/* Class table */Classno mediumint UNSIGNED not NULL DEFAULT 0,ClassName VARCHAR () not NULL DEFAULT "",Loc VARCHAR (+) not NULL DEFAULT "") Engine=innodb DEFAULT Charset=utf8;#创建表STUDENTS学生表CREATE TABLE

1. Download Pymysql and installAfter downloading the zip package, unzip to the directory, enter the directory, execute the following command to installPython setup.py Install2. Writing a simple Database access programsimple_mysql.pyImportPymysqlconn=

Create an advanced junctionThe last blog post simply introduces the use of the next link, and this post explains how to create an advanced junction.Using Table aliasesIn the previous study, we know how to give a list of aliases, and now look back,

Execute the SQL script in the MySQL command line. This article mainly introducesMySQL Command LineThe following example shows how MySQL executes the script under the command line. Now let's start to introduce this process. 1. Write an SQL script and

MySQL display command, mysql display command Although various graphical management tools facilitate MySQL management, you may need to manually enter commands for ease of use. The following commands are excerpted for your own use. 1. display the

Mysql database IntroductionMySQL Database: Oracle, DB2, SQL Server, MySQL, access, mangodb, bigtable   Relational Database Service Large Oracle and DB2 Medium and small SQL Server, MySQL Small Access Non-relational databases Mangodb, bigtable   What

The question mark (jdbcmysql) is displayed after the jdbc link mysql inserts data. 1. Go to mysql in cmd to view the default encoding format:Mysql> show variables like "% char % "; If it is not utf8 (because I use utf8), turn off the mysql service