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Snapping, second-kill is now a very common application scenario, there are two main issues to solve: 1 high concurrency pressure on the database 2 How to deal with the correct reduction of inventory ("oversold" issue) under competitive status For

Infinite classification is a kind of design skills, often used in development, this article mainly introduces the implementation of infinite classification of PHP, it is necessary to understand. Infinite class classification is a kind of design

This article mainly introduces the ThinkPHP permission authentication Auth instance. if you need it, you can refer to the following example code to thoroughly analyze the implementation principles and methods of ThinkPHP permission authentication

This article mainly introduces the methods and sample code for php to read txt files and insert data into the database. for small files, you can refer to the first method. for large files, see the second method. To test a function today, you need to

PARTITION technology for Mysql data tables in this section, we will understand the PARTITION technology (RANGE, LIST, HASH) in Mysql) The partitioning technology of Mysql is a bit similar to that of horizontal table sharding, but it is a

ThinkPHP Association Model description ThinkPHP In ThinkPHP, the association model is more similar to a foreign key constraint in mysql, but the foreign key constraint is safer, but it is not convenient to write SQL statements, thinkPHP solves

MySQL table sharding Methods: MySQL I. Let me explain why Table sharding is required. When a piece of data reaches several millions, it takes more time for you to query the data at a time. If there is a joint query, I think it may die there. The

ThinkPHP permission authentication Auth instance details, thinkphpauth This article provides an in-depth analysis of the implementation principles and methods of ThinkPHP permission authentication Auth in the form of instance code. The specific

The following articles mainly describe the solutions used by all the suppliers in Mysql query and any of their own products. This article mainly describes the specific use solutions of Group, according to a user's demand, the main cause is as

When creating an index, the MySQLMyIsam storage engine has a strict length limit. The maximum length of all index keys cannot exceed 1000, and it is not the sum of actual data lengths, the sum of the index key field definition length. Let's take a

MySQL "replace into", mysqlreplaceinto MySQL has many extensions for SQL, some of which are very convenient to use, but some may have performance problems after misuse, and some unexpected side effects, such as REPLACE. For example, there is a table:

Unlimited class classification is a design technique that is often used in development, such as: Site Directory, departmental structure, article classification. I think it plays a great role in the hierarchy of the design table, for example, in some

First, why do you want to divide the table:When a single piece of data reaches millions of, you'll have more time to query, and if you have a joint query, you might die there. The purpose of the table is to reduce the burden of the database and

This paper analyzes the implementation principle and method of thinkphp authorization auth in the form of instance code, the following steps are as follows: MySQL database part of SQL code: --------------------------------Table structure for

1. Quickly create a table of the same structure, including indexes: mysql> SHOW CREATE TABLE a; CREATE TABLE `a` ( `name` varchar(50) default NULL, KEY `name` (`name`) ) ENGINE=MyISAM DEFAULT CHARSET=latin1; mysql> CREATE TABLE b LIKE a; mysql>

52, set the change root password, connect MySQL, mysql common commandFirst, set the change root passwordThe root user is the MySQL Super Admin user, the root and system root is not a user, need to partition, you can also create a normal user to

Today and classmates talk about MySQL which storage engine support hash index, because the MySQL version of the book and the existing MySQL version of the discrepancy, so there is a bit of ambiguity. So just hit the code manually and test how the

This is a few days ago a recent graduation friend's face question, is the interview often encountered the SQL Classic topic, records ()Here I set up a corresponding table structure on the computer database for verifying the correctness of SQL

514722081 RBAC Database DesignRBAC resource-based access control (resource-based access control) is a resource-centric access controls share cow original, share cattle series, share cattle. How is the RBAC User Role Permissions Resource table

Brief introduction of MSQL data type 1, integer typetinyint, accounted for 1 bytes, signed: -128~127, unsigned bit: 0~255smallint, accounted for 2 bytes, signed: -32768~32767 unsigned bit: 0~65535Mediumint is 3 bytes, signed: -8388608~8388607,