MySQL

This article analyzes several methods for retrieving the root password of mysql. We mainly introduce how to retrieve the root password of mysql using multiple methods. Let's take a look at the tutorial below. In windows: Open the command line window

This article mainly introduces some conditions that affect database performance. You can refer to this article. Root Cause of impact on database performance: 1. Disk I/O read 2. CPU usage 3. Resource Competition Optimization Method: 1. Design

The "show processlist unauthenticated user" error message is displayed on a server today. Let's take a look at the solution. An unibilling machine suddenly experienced heavy loads a few days ago. it is found that cpu usage is high in top. the agi

This article introduces some strange causes for analysis and solutions to these problems when using the mysql server. For more information, see. Because of the relationship between the program to be debugged, the mysql settings are modified from the

I will share some date operations in mysql, that is, the addition or subtraction of mysql time and date that we often use. This mysql also has its own function, for more information, see. The simplest method The Code is as follows: Copy

This article shares an article on mysql date formatting implementation. This article mainly introduces some references for date_format () functions and their usage in cmd mode, in fact, it is the same in cmd and php. If you need it, you can refer to

Nowadays, many programmers do not take into account the large load when designing databases and developing programs. Sometimes, a certain amount of data is stuck, and the more difficult it will be to query it later, next we will provide a mysql tool

I will take a look at the simplest and commonly used method. Next I will introduce the efficient method of mysql random data. If you need it, please refer to it. 1] ordinary method, low efficiency The Code is as follows: Copy code

This MySQL server has gone away was suddenly encountered during development today. The analysis may be that the SQL statement sent is too long and exceeds the size of max_allowed_packet. If this is the reason, you only need to modify my. cnf:

During development, the myisam database needs to be converted to the innodb database. This method is often used because innodb supports many types that are not supported by myisam, such as stored procedures, here we provide a method. If you need it,

Let's take a look at the data export method and use the command line provided by mysql to import and export data, as shown below. Another way is to use php to import a. SQL file. Assume that the mysql user name and password are root xxx and the

This article introduces some differences and issues about using the is null function in mainstream databases. If you need it, you can give a simple reference. Isnull is used in database queries, especially when the statement is connected. For

MySQL configuration file my. cnf Chinese Version configuration Reference Document # 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 tutorial

In MySQL, table locks are not deadlocked when table-level locking is used for storage engines. This means that all necessary locks are requested immediately at the beginning of a query and the tables are always locked in the same order. The table

The following describes how to clear mysql logs. I will not talk about it much below. I don't need to enclose it in the code box. It's just text. # The line is a real example of commenting on the following, for reference: [Root @ aslibra www.aslibra.

Index You can use indexes to quickly access specific information in the database tutorial table. An index is a structure that sorts the values of one or more columns in a database table, for example, the last name (lname) column of the employee

The field table is not specified, So load data infile expects the input row to contain a field for each table column. Use the default fields and lines values. If you want to load only some columns of a table, specify a field table: Mysql tutorial>

Method 1: Solve the Problem of MySQL server has gone away. Of course, it is to increase your wait-timeout value. This parameter is in my. cnf (my. ini), my database tutorial load is slightly larger, so I set the value to 10 (The unit of this value

Full-text search of mysql tutorial. SQL statement:MATCH (col1, col2 ,...) AGAINST (expr [in boolean mode | with query expansion]) For example:SELECT * FROM articles where match (title, body) AGAINST ('database '); The MATCH () function performs a

These statements create a storage subroutine. To CREATE a subroutine in MySQL 5.1, you must have the create routine permission and the alter routine and EXECUTE permissions are automatically granted to its creator. If the binary log function is