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Technical Articles

Database

Mysql Tutorial

Debugging MySQL replication slave lag issues

To resolve the problem of MySQL master-slave replication delay, follow the steps to troubleshoot. 1. First check the status of the slave library, execute SHOWSLAVESTATUS\G, confirm that Slave_IO_Running and Slave_SQL_Running are Yes, observe whether the Seconds_Behind_Master value continues to increase and check whether there are errors in Last_Error. 2. Troubleshoot the load and network problems of the main library. Parallel replication can be enabled iftop when the main library has high write pressure; iftop detection can be used; high disk IO of the main library or serious lock competition will also affect the synchronization speed. 3. Check the performance bottleneck of the library, including CPU usage, disk IO status, missing table structure index, large transaction accumulation, etc.

Jul 02, 2025 pm 03:03 PM

mysql copy Delayed debugging

Using window functions in MySQL 8.0 for advanced analytics

MySQL 8.0 introduces window functions, simplifying complex queries. 1. The window function returns statistical values ??for each row and retains the original data; 2. Common functions include ROW_NUMBER(), RANK(), DENSE_RANK(), SUM(), AVG(), etc.; 3. It can be used to rank by category, sum up, and obtain grouped head and tail records; 4. Usage techniques include clarifying PARTITIONBY, ORDERBY and window range settings, and paying attention to index optimization performance.

Jul 02, 2025 pm 02:56 PM

Choosing the right MySQL data types for efficiency

Choosing the right MySQL data type directly affects storage efficiency and query performance. 1. Try to use smaller types, such as TINYINT instead of INT, strings are selected according to length, and DATETIME or DATE are preferred; 2. Clearly set NOTNULL to improve indexing efficiency, if the mobile phone number is set to VARCHAR(20)NOTNULLDEFAULT'', use NOTNULLDEFAULTCURRENT_TIMESTAMP when creating time; 3. Use TEXT/BLOB type with caution to avoid frequent use in query conditions. When the data volume is large, it should be split into separate tables and matched with the full text index; 4. Use ENUM and SET types reasonably

Jul 02, 2025 pm 02:49 PM

mysql workbench table data import wizard error

When encountering MySQLWorkbenchTableDataImportWizard error, the common causes and solutions are as follows: 1. File path or permission problem, check whether the path is correct, avoid special characters, and ensure that there is read permission; 2. Data format does not match, confirm the field type, order and null value processing method, and you can first import the temporary table to clean the data; 3. Encoding format problem, select the character set consistent with the file or convert it to UTF-8; 4. Ignore the first row and column name, separator setting error, or failure caused by large files, pay attention to check the column name option, adjust the separator, and split the large file, or import it using command line tools.

Jul 01, 2025 am 01:44 AM

mysql access denied for user root@localhost

Accessdeniedforuser'root'@'localhost' is usually caused by password errors, insufficient permissions, user binding problems or configuration files. The specific solutions are as follows: 1. Confirm whether the password is correct or try to log in with empty password and set a new password; 2. If the permissions are insufficient, you can enter safe mode to reset the password and update the permissions; 3. Check whether the corresponding host of the user matches the connection method, and manually create and authorize the user if necessary; 4. Check the configuration file and authentication plug-in to ensure that skip-name-resolve is not enabled or the correct authentication plug-in is used.

Jul 01, 2025 am 01:43 AM

how to completely uninstall mysql from windows

To completely uninstall MySQL, multiple residual items need to be manually cleaned. 1. Stop and delete the MySQL service: Execute scdeleteMySQL80 through the service manager or command prompt (adjust according to the actual service name). 2. Uninstall MySQL-related programs through the control panel, including MySQLServer, Connector, etc. 3. Delete residual files: Clear the contents under the default paths C:\ProgramFiles\MySQL and C:\ProgramData\MySQL, and find the scattered my.ini or my.cnf configuration files. 4. Optional cleaning of the registry: Delete HKEY_LOCAL_MACHINE\SY in the registry editor

Jul 01, 2025 am 01:43 AM

how to check mysql version on windows command prompt

To check the MySQL version, you can use the following methods in the Windows command prompt: 1. Use the command line to view directly, enter mysql--version or mysql-V; 2. After logging in to the MySQL client, execute SELECTVERSION();; 3. Manually search through the installation path, switch to the MySQL bin directory and run mysql.exe--version. These methods are suitable for different scenarios, the first two are most commonly used, and the third one is suitable for situations where environment variables are not configured.

Jul 01, 2025 am 01:41 AM

mysql version

Advanced mysql tutorial on stored procedures

Stored procedures improve performance and reduce network traffic by encapsulating database logic. The process of creating parameters requires CREATEPROCEDURE and pay attention to the separator settings, such as using IN, OUT or INOUT to define the parameter orientation. Pass parameter values ??using CALL statements when calling. Variables can be declared in the process and combined with conditional judgments (such as IF or CASE) to implement complex logic to centrally process business rules. Error handling can trigger custom exceptions through SIGNAL. It is recommended to use logs, segment-by-stage testing and SHOWWARNINGS to assist debugging. After mastering these techniques, you can effectively simplify application code and enhance database control capabilities.

Jul 01, 2025 am 01:39 AM

How to add the MySQL bin directory to the system PATH

To add MySQL's bin directory to the system PATH, it needs to be configured according to the different operating systems. 1. Windows system: Find the bin folder in the MySQL installation directory (the default path is usually C:\ProgramFiles\MySQL\MySQLServerX.X\bin), right-click "This Computer" → "Properties" → "Advanced System Settings" → "Environment Variables", select Path in "System Variables" and edit it, add the MySQLbin path, save it and restart the command prompt and enter mysql--version verification; 2.macOS and Linux systems: Bash users edit ~/.bashrc or ~/.bash_

Jul 01, 2025 am 01:39 AM

mysql path

Can I install MySQL without using the installer

Yes, you can install MySQL without using the standard installer. You can implement it by downloading and decompressing ZIP files (Windows), using package manager (Linux), or manually compiling from source code (advanced users); each method requires manual configuration settings, including configuration files, data directory initialization and service settings.

Jul 01, 2025 am 01:38 AM

mysql tutorial building a simple login system

The core of the implementation of the login system includes four key points: database design, user input processing, password security and login status maintenance. First, the database design needs to create a user table containing fields such as id, username, email, password hashing and registration time, and ensure that the username and email address are unique; second, when verifying user information, preprocessing statements should be used to query the database to compare the hash passwords entered and stored by the user; third, the protection password must be encrypted using strong hash algorithms such as bcrypt or Argon2 to avoid plaintext storage; finally, the login status can be maintained through Session or Token (such as JWT). The former is suitable for small and medium-sized projects, and the latter is more suitable for front-end and back-end separation scenarios, and pay attention to setting security attributes to prevent attacks.

Jul 01, 2025 am 01:38 AM

What are the core differences between the InnoDB and MyISAM storage engines?

InnoDB is suitable for scenarios where transaction support is required, high concurrent writes and data consistency is suitable for simple queries that mainly focus on reads and require no transactions. 1.InnoDB supports transaction and ACID characteristics to ensure the atomicity and consistency of operations; MyISAM does not support transactions, and errors may lead to data inconsistency. 2. InnoDB uses row-level locks to improve concurrency performance; MyISAM uses table-level locks, frequent writing can easily cause performance bottlenecks. 3. InnoDB supports foreign key constraints to ensure the integrity of relationships between tables; MyISAM does not support foreign keys. 4.InnoDB has a crash recovery mechanism; MyISAM needs to be repaired manually. 5. Both support full-text indexing, but MyISAM's simplicity of static data in small scale

Jul 01, 2025 am 01:37 AM

mysql tutorial for Windows 10 installation

The key steps to install MySQL on Windows 10 include: 1. Download the MySQL installation package suitable for Windows. It is recommended to select MySQLInstaller for Windows; 2. Use a custom installation method to check MySQLServer, MySQLConnector/C or Python and MySQLWorkbench; 3. Set the root user password and save it; 4. Add the bin directory of MySQL to the system environment variables for use on the command line; 5. After the installation is completed, connect to the database through the command line or MySQLWorkbench. There will be no problems following these steps, and the service startup failure will occur.

Jul 01, 2025 am 01:36 AM

How to install MySQL on CentOS 9

The key steps to install MySQL on CentOS9 include adding an official YUM source, installing a MySQL server, starting and enabling services, performing secure initialization, and configuring a firewall. First, use dnfinstallhttps://dev.mysql.com/get/mysql80-community-release-el9-7.noarch.rpm to add the official source; secondly, run dnfinstallmysql-server to install MySQL; then, start the service through systemctlstartmysqld and systemctlenablemysqld and set up the power-on self-start;

Jul 01, 2025 am 01:35 AM