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Technical Articles

Database

Mysql Tutorial

How do MyISAM table locks vs InnoDB row locks affect an application?

MyISAM uses table locks, which are suitable for read-only or low-concurrency scenarios; InnoDB uses row locks, which are suitable for high-concurrency writing. 1.MyISAM write operation will lock the entire table, affecting concurrency performance; 2.InnoDB only locks the affected rows to improve concurrency processing capabilities; 3. If transactions or foreign key support is required, InnoDB must be used; 4. Select the appropriate engine based on the data volume and read and write frequency.

Jun 28, 2025 am 02:11 AM

MyISAM lock InnoDB Lock

mysql access denied for user 'root'@'localhost' mac

When you encounter MySQL login error, Accessdeniedforuser'root'@'localhost', first check whether the password is correct or try to reset the password: 1. Stop the MySQL service and skip the permission verification startup; 2. Enter MySQL to modify the root user password and restart the service. Secondly, confirm whether the wrong use of the -p parameter leads to forced entry of the password. If root does not set a password, you should log in directly. Then check the user permission configuration to ensure that 'root'@'localhost' exists and the permissions are correct, and manually create and authorize if necessary. Finally, confirm whether the MySQL service has been started. If it is not started, start the service to resolve the problem.

Jun 28, 2025 am 02:11 AM

optimize mysql performance on windows

MySQL's poor performance on Windows is mainly due to configuration and environment issues, not MySQL itself is slow. 1. Adjust the my.ini configuration parameters, such as setting innodb_buffer_pool_size to 50%~70% of memory, increasing innodb_log_file_size to 256M or higher, setting max_connections reasonably, and deciding whether to enable query cache based on the version. 2. Use SSD to improve disk IO, separate data from log file storage paths, enable innodb_flush_method=O_DIRECT and turn off NTFS access time update. 3. Regularly execute ANALYZETABLE

Jun 28, 2025 am 02:10 AM

mysql performance

where is my.ini mysql file in windows

Tofindthemy.inifileinMySQLonWindows,checkcommondefaultlocationssuchasC:\ProgramData\MySQL\MySQLServerX.Y\my.iniorC:\ProgramFiles\MySQL\MySQLServerX.Y\my.ini,notingthatProgramDataisahiddenfolder.Alternatively,usetheMySQLclientcommandSHOWVARIABLESLIKE'

Jun 28, 2025 am 02:05 AM

mysql tutorial for Mac installation

Installing MySQL is the easiest to use Homebrew on Mac. The key steps include: 1. Install Homebrew and configure environment variables; 2. Install MySQL through the brewinstallmysql command; 3. Use brewservices to start and set up the power-on self-start; 4. Run mysql_secure_installation for secure initialization; 5. Log in to the database to test whether it works normally; Common problems such as port conflicts, forgetting passwords, etc. can be solved by changing ports, safe mode, resetting passwords or cleaning old services.

Jun 28, 2025 am 02:04 AM

MySQL server not starting after install

Common reasons and solutions for the service cannot be started after MySQL installation are as follows: 1. Check the error log to obtain specific error information. The path is usually /var/log/mysql/error.log or the location specified in the log_error in the configuration file; 2. When the port is occupied, you can use the lsof or netstat command to view the occupancy of port 3306 and handle it; 3. Data directory permission issues need to ensure that /var/lib/mysql belongs to mysql:mysql user and sets 755 permissions, and re-initialize if necessary; 4. Configuration file errors should be checked for my.cnf or my.ini parameter settings. It is recommended to use the default configuration to troubleshoot problems after backup. Combined with log analysis, it can basically solve multiple problems

Jun 28, 2025 am 02:00 AM

mysql Startup failed

Where is the my.cnf file located after a clean MySQL install

MySQL's my.cnf file may not exist after a clean installation, but can be found via standard paths or created manually. Common locations include /etc/my.cnf, /etc/my.cnf, /usr/local/etc/my.cnf and ~/.my.cnf; the search order can be confirmed by the command mysql--help|grep"my.cnf". If the file does not exist, MySQL will use the built-in default value. To customize the configuration, copy the sample file (such as my-default.cnf) from /usr/share/mysql/ to the standard path and edit it. Execute SH through MySQL client

Jun 28, 2025 am 01:57 AM

How to fix 'Failed to start mysql.service: Unit mysql.service not found'

If you encounter the problem of "Failedtostartmysql.service:Unitmysql.servicenotfound", it means that the system cannot find the MySQL service unit file, which is usually due to incorrect installation or the service name is incorrect. 1. First check whether MySQL is installed, use mysql--version to confirm, and reinstall if not installed; 2. Check whether the service name is mysqld or other variants, use the systemctllist-units or ls command to find it; 3. Confirm whether MariaDB is installed instead of MySQL and check the mariadb service status; 4. Advanced users can try to manually create mysql.ser

Jun 28, 2025 am 01:54 AM

mysql Startup failed

install mysql on windows using zip file

1. Unzip the ZIP file to the appropriate path; 2. Create my.ini configuration file and initialize it; 3. Install MySQL as Windows service and start it; 4. Log in and modify the initial password. First download the ZIP version and unzip it to a path without Chinese and spaces, such as C:\mysql; then create my.ini file in the root directory, configure the basedir and datadir paths, and execute mysqld-initialize-console to generate the data directory and temporary password; then run cmd as an administrator, enter the bin directory to execute the mysqld-install registration service, and then use netstartmysql to start the service; finally use m

Jun 28, 2025 am 01:53 AM

mysql windows

how to completely uninstall mysql from mac

To completely uninstall MySQL requires deleting the main program, configuration files, and system service residues. 1. Uninstall the main program: If it is installed for the installation package, use sudorm-rf/usr/local/mysql* to delete it; if it is installed for Homebrew, execute brewuninstallmysql. 2. Delete data and configuration files: Check and clear files under the paths such as /etc/my.cnf, ~/.my.cnf, /usr/local/etc/my.cnf, /var/db/mysql, /usr/local/var/mysql, ~/.mysql_history, etc. 3. Clean up startup items and service residues: through ls

Jun 28, 2025 am 01:50 AM

how to create new user in mysql windows command line

The steps to create a new MySQL user in the Windows command line are as follows: 1. Log in to MySQL with the administrator account, enter mysql-uroot-p and enter the password correctly; 2. Create a user using the CREATEUSER statement, such as CREATEUSER'testuser'@'localhost'IDENTIFIEDBY'password123'; 3. Use GRANT to grant permissions and execute FLUSHPRIVILEGES refresh permissions; 4. After logging out, try to log in with the new user to verify whether the creation is successful. The entire process needs to pay attention to the accuracy of path, syntax and permission settings.

Jun 28, 2025 am 01:48 AM

Is NULL the same as an empty string '' in MySQL?

InMySQL,NULLandanemptystring''arenotthesame.1)NULLrepresentstheabsenceofavalueorunknowndata,whileanemptystringisavalidstringwithzerocharacters.2)Comparisonoperatorslike=,!=,ordonotworkwithNULL;instead,ISNULLorISNOTNULLmustbeused.3)Aggregatefunctionss

Jun 28, 2025 am 01:48 AM

mysql workbench cannot connect to database server

When encountering the "CannotConnecttoDatabaseServer" problem, first check whether the MySQL service is running, then check the connection parameters, then check the firewall or antivirus software restrictions, and finally confirm the user permission configuration. 1. Check the status of MySQL service. Start the MySQL service through the service manager under Windows. macOS/Linux uses the command line to view and start it; 2. Check whether Hostname, Port, Username and Password are correct, and try to verify the connection with the command line; 3. Close the firewall test connection, check whether the server firewall and cloud platform security group release port 3306; 4. If you connect remotely, you need to create a

Jun 28, 2025 am 01:32 AM

Connection failed

How to change theme or enable dark mode in mysql workbench

MySQLWorkbenchdoesnothaveabuilt-indarkmode,butyoucancustomizeitsappearancepartiallythroughseveralmethods.First,enablesystem-widedarkmodeonWindowsormacOStodarkensomeUIelementslikemenusanddialogs—thoughtheSQLeditorremainslight.Second,manuallyeditthecod

Jun 28, 2025 am 01:26 AM