MySQL

Dual-system configuration and MySQL database storage situation: the mysql database is stored in d: \ MySQL \ data under Windows XP, And the Linux system is Ubuntu Server 9.10.After the dual-system is installed, use GURB to start to Ubuntu Server 9.10

1. database/table sharding Obviously, the unlimited growth of a primary table (that is, a very important table, such as a user table) will inevitably seriously affect performance. Database sharding and table sharding are a good solution, this is

Use case when for string replacementCopy codeThe Code is as follows:/*Mysql> select * from sales;+ ----- + ------------ + -------- + ------ + ------------ +| Num | name | winter | spring | summer | fall | category |+ ----- + ------------ + -------- +

Solution 1:Recursive Algorithms are also the most frequently used. Most open-source programs do the same, but generally only use level 4 classification. The database structure design of this algorithm is the simplest. Id of a field in the category

1. Load records in text files into mysql database tables(1) Text File Format: one record per line. The field values are separated by the tab operator. The field order is the same as the order in the table definition. The uncertain field values are

# BEGIN CONFIG INFO# DESCR: 4 gb ram, only InnoDB, ACID, a small number of connections, large queue Load# TYPE: SYSTEM# END CONFIG INFO## This mysql configuration file example is for 4 GB memory# Mainly use INNODB# Mysql servers that process complex

Statement: UPDATETestSETAge=5 WHERE'Name'='Wang Mang' As the name implies, Wang's age is changed to 5, but the result is helpless -- The number of affected rows is 0. What's going on? The syntax is correct. It's okay ...... I changed it and removed

1. Download the RPM installation package. Because the software requires a dependency when installing MySQL, we recommend that you download all the installation packages and then install the RPM packages in sequence.2. After installation in RedHat,

Add skip-innodb TO my. ini (/etc/my. cnf in linux.After I set it like this, there is no problem in linux. I started MYSQL in winXP on my local machine today, prompting that the MYSQL cannot be started. Check the error log of the mysql

Put mysql.exe in the binary directory under mysqldirectory under C: \ WINDOWS. You can run the following command:Connection: mysql-h host address-u user name-p User Password (Note: u and root do not need to add spaces, the same is true for

This means that the database and table names are case-insensitive in Windows and are case-sensitive in most types of Unix systems. A special case is Mac OS X, which is used by the default HFS + file system. However, Mac OS x also supports UFS

Because the database records may need to be reordered. In this article, I will talk about two ideas to improve the query efficiency of Order By statements for your reference. In MySQL databases, Order by statements are frequently used. However, it

1. If the connection between the client and the server needs to span and pass through an untrusted network, you need to use an SSH tunnel to encrypt the communication between the client and the server.2. Use the set password statement to modify the

Description:When using mysqldump to export a Trigger, you may encounter a problem and paste it to avoid mistakes.When you perform the following operations:Copy codeThe Code is as follows:[Root @ ytt ~]

Directory1. Character Set Selection 12. Primary Key 13. Foreign key 24. index 24.1 The following conditions are suitable for creating an index 24.2. Index 3 is not suitable in the following cases4.3. Joint index 34.4. Index length 45. Special Field 4

1. Design Principles1) standardization and standardization Data Standardization helps eliminate data redundancy in databases. There are several forms of standardization, but Third Normal Form (3NF) is generally considered to have achieved the best

Usage of mysql time Conversion Function DAYOFWEEK (date)Returns the index of the week of the date (1 = Sunday, 2 = Monday ,...... 7 = Saturday ). These index values correspond to the ODBC standard.Mysql> select DAYOFWEEK (2007-10-31 );-> 4WEEKDAY

Conventions and Styles Conventions and programming StylesEvery time I want to demonstrate the actual code, I will adjust the code displayed on the screen of the mysql client and change the font to Courier, make them look different from common text

The UDF of MySQL is a dynamic Connection Library (* Nix is called a shared library) that does not need to set the entry point ). You can call this method to debug a DLL. Now I will introduce a very simple and easy-to-use debugging method. This

Before discussing how to start the MySQL server, let's take a look at the user identity to run the MySQL server. The server can be started manually or automatically. If you manually start it, the server is started as the user you log on to Unix