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Technical Articles

Database

Mysql Tutorial

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

mysql tutorial for PHP web development

To use PHP for MySQL web development, you must first master the connection to the database, perform query and data operations. 1. It is recommended to use mysqli extension to connect to the database. Create a connection through newmysqli() and check whether it is successful; 2. Use query() method to execute SQL queries, combine fetch_assoc() to traverse the result set, and pay attention to prevent preprocessing statements from being used to prevent SQL injection; 3. When inserting or updating data, use prepare() and bind_param() to bind parameters to ensure safe transmission of values; 4. Common errors include connection failure, query results, insertion conflicts, etc. You can troubleshoot problems by checking configuration, field names, constraint restrictions and opening error prompts. Master these basics

Jun 28, 2025 am 01:16 AM

how to connect to mysql database from python on windows

To connect to the MySQL database from Python on Windows, you need to install the mysql-connector-python or pymysql module and correctly configure the connection parameters and network permissions. 1. Install module: Use pipinstallmysql-connector-python or pipinstallpymysql; 2. Configure connection information: Provide host, user, password and database parameters. It is recommended to manage sensitive information through environment variables or configuration files; 3. Ensure that the database user has remote access rights (such as remote database); 4. Check the firewall settings to ensure that port 3306 is open; 5

Jun 28, 2025 am 01:06 AM

How to check for replication lag between a master and slave?

To check the replication delay between master and slave servers, you can achieve it in the following four methods: 1. Use built-in database commands to view the replication status, such as MySQL's SHOWSLAVESTATUS or PostgreSQL related query statements to directly obtain the delay indicator; 2. Use monitoring tools such as Prometheus, Zabbix or PMM to automatically detect and set alarms; 3. Create a heartbeat table at the application layer and update and query regularly to calculate the delay; 4. Troubleshoot whether system resource problems such as network bandwidth, server CPU, disk IO and other systems cause delays. These methods can effectively judge and deal with replication delay issues.

Jun 28, 2025 am 01:06 AM

mysql tutorial on command line basics

Using command-line operations after logging in to MySQL is the basis. 1. Use mysql-uroot-p to log in, exit with exit; or Ctrl D; 2. Use SHOWDATABASES to view the database; use USEyour_database_name to enter the database; 3. Use CREATEDATABASEnew_database_name to create the database; use DROPDATABASEdatabase_name to delete; 4. Use SHOWTABLES to view the table structure; use DESCRIBEtable_name to query the data; use SELECTFROMtable_name to avoid in production environments

Jun 28, 2025 am 12:29 AM

mysql tutorial on the SELECT statement

TheSELECTstatementisthemostcommonlyusedSQLcommandforretrievingdatafromMySQLdatabases,allowinguserstospecifywhichcolumnstoretrieve,filterrowsbasedonconditionsusingWHERE,andsortresultswithORDERBY.1)UseSELECTcolumn1,column2FROMtable_name;tofetchspecific

Jun 27, 2025 am 01:57 AM

connect to mysql from command line mac

The steps to connect to the MySQL database are as follows: 1. Make sure that MySQL is installed and run, use brewserviceslist to view the status, and if it is not started, use brewservicesstartmysql to start; 2. Use the mysql-u[username]-p command to connect to the local database, enter the password to enter the interactive interface, and the remote connection needs to be added with the -h[hostname or IP] parameter; 3. When encountering problems, if you cannot log in, you should check the user permissions. If the prompt command does not exist, use the full path. If the connection timeouts, check the firewall or configuration file binding.

Jun 27, 2025 am 01:57 AM

mysql workbench set query timeout

Setting the query timeout in MySQLWorkbench requires multiple indirect ways. 1. You can use SQL instructions such as SELECT/MAX_EXECUTION_TIME(5000)/*FROMyour_table; to limit the execution time of a single SELECT query; 2. Modify the session variables SETSESSIONwait_timeout=60; and SETSESSIONinteractive_timeout=60; to control the idle disconnection time of the connection, but do not terminate the executing query; 3. If you connect to the database through a script or program, it is recommended to set the query timeout in the code; 4. Select "Stan" in the connection configuration.

Jun 27, 2025 am 01:55 AM

Query timeout