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  • Implementing MySQL Multi-Source Replication
    Implementing MySQL Multi-Source Replication
    MySQL multi-source replication requires attention to version support, multi-main library connection configuration, replication process management and data conflict handling. ①MySQL 5.7 or higher must be used, 8.0 is recommended; ② Establish an independent replication channel (Channel) for each master library to ensure that the name is unique, the network is accessible, and the permissions are correct; ③ Use STARTSLAVE or a designated channel to start replication, and regularly check the Seconds_Behind_Master to monitor the synchronization status; ④ Avoid multiple masters writing to the same table, set self-increasing offset, and control the write path through the application layer to reduce conflicts; ⑤ Check the log and process it in time when an error occurs.
    Mysql Tutorial . Database 901 2025-08-02 02:32:00
  • MySQL Auto-Increment Handling and Best Practices
    MySQL Auto-Increment Handling and Best Practices
    MySQL auto-increment field (Auto-Increment) is used to automatically assign unique values and is often used in primary key design. 1. The self-increment field may skip the number, reasons include insertion failure, transaction rollback, batch insertion partial failure, master-slave replication delay, or recalculating the starting value after MySQL restart. 2. If the value-added is set improperly, it may cause overflow. For example, TINYINT only supports 127 records at most. It is recommended to select INTUNSIGNED or BIGINT based on the data size. 3. There may be self-increasing conflicts in master-slave replication, which can be resolved by setting step offset, using UUID, or writing to the master library in a unified manner. Other precautions include avoiding manual intervention in self-increase fields, regularly checking self-increase status, and doing business logic without relying on self-increase order.
    Mysql Tutorial . Database 759 2025-08-02 02:21:00
  • How to Use the GROUP BY Clause and Aggregate Functions in MySQL?
    How to Use the GROUP BY Clause and Aggregate Functions in MySQL?
    TheGROUPBYclausegroupsrowswiththesamevaluesinspecifiedcolumns,enablingdatasummarizationwithaggregatefunctions.2.CommonaggregatefunctionsincludeCOUNT()tocountrows,SUM()toaddvalues,AVG()tocalculateaverages,MAX()tofindthehighestvalue,andMIN()tofindthelo
    Mysql Tutorial . Database 889 2025-08-02 01:14:01
  • Implementing MySQL Online Schema Changes with gh-ost or pt-online-schema-change
    Implementing MySQL Online Schema Changes with gh-ost or pt-online-schema-change
    How to choose gh-ost or pt-online-schema-change? 1.pt-online-schema-change belongs to PerconaToolkit, with a long history and good community support; 2.gh-ost is lighter and supports triggerless mode, suitable for high concurrency or large table scenarios. The core process during use: 1. Create a new table and apply a new schema; 2. Copy the original table data; 3. Synchronize incremental changes (trigger or binlog); 4. Replace the original table. Notes include: 1. Ensure that the index and foreign keys are correct; 2. Pay attention to the short locks in the switching stage; 3. Reserve enough disk space; 4. Monitor copy delays. Common error checks: 1. Check locks waiting and dead
    Mysql Tutorial . Database 412 2025-08-02 00:25:01
  • Securing MySQL from Brute-Force Attacks
    Securing MySQL from Brute-Force Attacks
    To prevent MySQL from being brute-forced attacks, you should first prohibit unnecessary remote access, modify bind-address to 127.0.0.1 or specify IP, and avoid using 0.0.0.0.0; secondly, strengthen the account password policy, use strong passwords, disable default accounts, enable validate_password plug-in, and change passwords regularly; thirdly, use a firewall to restrict access ports, set login failure restrictions and monitor logs; in addition, changing the default port, keeping MySQL version updated, and enabling SSL encrypted connections are also important measures, and security protection needs to be continuously optimized and monitored.
    Mysql Tutorial . Database 758 2025-08-02 00:24:01
  • MySQL and Kubernetes: Deploying StatefulSets for Scalability
    MySQL and Kubernetes: Deploying StatefulSets for Scalability
    StatefulSets is suitable for deploying MySQL because it provides stable network identity and persistent storage. Each Pod has an independent host name (such as mysql-0, mysql-1) for easy master-slave configuration, combined with HeadlessService to implement DNS resolution, and each Pod binds a PVC to ensure data durability; the deployment steps include creating a HeadlessService, defining StatefulSet, configuring environment variables, and using volumeClaimTemplates; in terms of storage, you need to allocate independent PVC for each Pod, selecting a suitable StorageClass and ensuring that the data directory is mounted to a persistent volume; if it is highly available, you need to manually configure the master.
    Mysql Tutorial . Database 414 2025-08-01 07:23:41
  • Mastering MySQL Triggers for Data Integrity and Automation
    Mastering MySQL Triggers for Data Integrity and Automation
    MySQL trigger is a stored program that is automatically executed on tables, suitable for data consistency maintenance, change logging, business rule implementation and other scenarios. Its creation includes defining the trigger timing (BEFORE or AFTER), event type (INSERT, UPDATE, DELETE), association tables and specific logic. For example, a log can be logged when the user inserts: CREATETRIGGERafter_user_insertAFTERINSERTONusersFOREACHROWBEGINSERTINTOuser_logs...END. BEFORE triggers can be used for data verification, such as limiting discounts not exceeding 50%: CRE
    Mysql Tutorial . Database 255 2025-08-01 07:22:40
  • What are the different types of table locks in MySQL?
    What are the different types of table locks in MySQL?
    Readlocksallowconcurrentreadsbutblockwrites;2.Writelocksprovideexclusiveaccess,blockingallotherreadandwriteoperations;3.ExplicitlocksaremanuallysetwithLOCKTABLESandreleasedwithUNLOCKTABLES,whileimplicitlocksareautomaticallymanagedbyMySQLdependingonth
    Mysql Tutorial . Database 668 2025-08-01 07:19:31
  • How to Perform Point-in-Time Recovery Using the Binary Log?
    How to Perform Point-in-Time Recovery Using the Binary Log?
    To restore the MySQL database to a specific point in time, you must first restore the complete backup, and then use binary logs to replay the changes. The specific steps are: 1. Use mysqldump and other tools to restore the most recent complete backup to bring the database back to the state at the time of backup; 2. Use mysqlbinlog to analyze the binary logs in combination with time range or location information, and locate the time point or event location that needs to be restored; 3. Use mysqlbinlog to read the binary log from the backup time to the target time point, and redirect its output to the MySQL server for execution, thereby replaying all legal operations within this time period; To ensure accuracy, it is recommended to use log location instead of timestamp, and test the recovery process in a non-production environment, and enable-
    Mysql Tutorial . Database 283 2025-08-01 07:13:00
  • Understanding MySQL Connection Pooling and Management
    Understanding MySQL Connection Pooling and Management
    MySQL connection pool is a "connection repository" that is used to efficiently manage database connections and avoid resource waste and performance bottlenecks. Its core function is to create connections in advance for programs to "borrow and return" to reduce the overhead of frequent connection establishment and destruction. Common configuration parameters include: 1. Max_connections; 2. Idle connection timeout time (idle_timeout); 3. Wait timeout time (wait_timeout); 4. Initial connection number (initial_size). When selecting a connection pool library, you can consider HikariCP, Druid, C3P0, etc. The usage steps include introducing dependencies, configuring parameters, initializing, obtaining and returning connections. Frequently asked questions about connection leaks
    Mysql Tutorial . Database 809 2025-08-01 07:11:41
  • Choosing the Right MySQL Data Types for Optimal Performance
    Choosing the Right MySQL Data Types for Optimal Performance
    Choosing the right MySQL data type can significantly improve performance. 1. The numerical type should be selected according to the value range and storage space. For example, TINYINT is suitable for the status field, and BIGINT avoids waste; 2. VARCHAR in the character type is suitable for content with large length changes, and CHAR is used for fixed length fields; 3. The time type DATETIME is suitable for large-scale time points, TIMESTAMP is suitable for time fields related to time zones and needs to be automatically updated, and DATE only has dates; 4. Large fields such as TEXT and BLOB should be used with caution to avoid affecting the sorting performance. It is recommended to split them into separate tables to optimize query efficiency.
    Mysql Tutorial . Database 966 2025-08-01 07:08:51
  • What is the MySQL error log and where to find it?
    What is the MySQL error log and where to find it?
    TheMySQLerrorloglocationcanbefoundbycheckingtheconfigurationfileorusingaSQLcommand.First,checkthemy.cnformy.inifileforthelog_errordirective;commonpathsinclude/etc/my.cnfonLinuxandmy.inionWindows.Second,ifnotspecified,usedefaultlocationssuchas/var/log
    Mysql Tutorial . Database 300 2025-08-01 07:07:20
  • How to Reset the Root Password in MySQL?
    How to Reset the Root Password in MySQL?
    StoptheMySQLserviceusingsystemctl,service,ornetstopdependingonyourOS.2.StartMySQLinsafemodewith--skip-grant-tablesand--skip-networkingtobypassauthentication.3.ConnecttoMySQLasrootwithoutapasswordusingmysql-uroot.4.ResettherootpasswordusingALTERUSERfo
    Mysql Tutorial . Database 337 2025-08-01 06:57:21
  • Optimizing MySQL for Geo-Spatial Data with GIS Functions
    Optimizing MySQL for Geo-Spatial Data with GIS Functions
    ToefficientlyhandlegeospatialdatainMySQL,usethePOINTdatatypewithSRID4326forGPScoordinates,createspatialindexes(especiallyonInnoDBinMySQL8.0 ),andutilizebuilt-inGISfunctionslikeST_Distance_Sphereforaccurateandperformantqueries.1.StorecoordinatesinaPOI
    Mysql Tutorial . Database 621 2025-08-01 06:54:51

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