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Home

Technical Articles

Database

Mysql Tutorial

How to use MySQL Workbench for database design

Create a new EER model: Start MySQLWorkbench, create a new model and add a named pattern (such as myapp_db) to start the design. 2. Add a table: Use the toolbar to add a table on the canvas, double-click to configure the table name, column name, data type, primary key, non-empty and self-increment properties, and set the index and foreign keys. 3. Define table relationships: Use foreign key tools to connect child tables with parent tables, set reference columns and cascade operations, and identify one-to-many relationships through visual symbols. 4. Forward-generation database: Generate SQL scripts and execute the model through "ForwardEngineer", thereby creating the actual database on the MySQL server. 5. Reverse generation model (optional): Connect to existing databases and reversely generate EER graphs for convenience

Aug 08, 2025 pm 05:32 PM

Database Design

How to truncate a table in MySQL

TotruncateatableinMySQL,usetheTRUNCATETABLEstatement;thisremovesallrowsquickly,resetsauto-incrementcounters,andkeepsthetablestructureintact.1.ExecuteTRUNCATETABLEtable_name;forexample,TRUNCATETABLEusers;2.NotethatitisfasterthanDELETEasitisaDDLoperati

Aug 08, 2025 pm 05:27 PM

How to perform a point-in-time recovery in MySQL

Enablebinaryloggingbyconfiguringlog-binandserver-idinmy.cnf/my.iniandrestartMySQL,confirmingwithSHOWVARIABLESLIKE'log_bin';2.Takeafullbackupusingmysqldumpwith--single-transaction,--flush-logs,and--master-data=2toensureconsistencyandrecordbinlogpositi

Aug 08, 2025 pm 05:05 PM

mysql 時(shí)間點(diǎn)恢復(fù)

What is Galera Cluster for MySQL and how does it provide high availability?

GaleraClusterforMySQLprovideshigh-availabilitythroughsynchronousmulti-masterreplication,ensuringdataconsistencyandminimaldowntime.1)Itworksbyexecutingtransactionslocally,broadcastingthemcluster-wide,certifyingforconflicts,andapplyingtheminthesameorde

Aug 08, 2025 pm 04:58 PM

High availability

How to find the size of a database in MySQL

To view the size of the MySQL database, 1. You can obtain the total size of the specified database (including data and index) by querying the information_schema database, use SUM (DATA_LENGTH INDEX_LENGTH) and convert it to MB; 2. When querying all databases, arrange it in descending order of total size to identify the database that consumes the most space; 3. View the size distribution of each table in a single database, which can help discover large tables that need to be optimized. All queries are safe and fast, because information_schema only stores metadata.

Aug 08, 2025 pm 04:01 PM

How to migrate from Oracle to MySQL

AssesscompatibilitybyevaluatingdifferencesinSQLdialects,datatypes,andarchitecture,inventoryingdatabaseobjects,andusingtoolslikeMySQLMigrationToolkitorAWSDMS.2.ConvertschemabytransformingDDLstatements—replaceOraclesequenceswithAUTO_INCREMENTorMySQL8.0

Aug 08, 2025 pm 03:49 PM

How to implement a search functionality with LIKE operator wildcards in MySQL?

To implement the search function of using LIKE operators in MySQL, you need to master the usage of wildcard % and \_, and combine preprocessing statements to ensure security and performance. The specific steps are as follows: 1. Use % to match zero or more characters, such as '%keyword%' to find any text containing keywords; 2. Use \_ to match a single character, such as '\_ohn' to match a four-letter name ending with "ohn"; 3. Use preprocessing statements to bind parameters in back-end languages such as PHP to prevent SQL injection, such as using PDO's prepare and execute methods; 4. In order to implement case-insensitive search, you can use the LOWER() function to convert case uniformly or set appropriate words

Aug 08, 2025 pm 03:32 PM

mysql Search function

How to add a partition to an existing table in MySQL

For non-partitioned tables, the entire partition structure must be redefined using ALTERTABLE...PARTITIONBY. This operation will rebuild the table and may cause locking tables; 2. For partitioned tables, if they are of RANGE or LIST type, you can directly use ALTERTABLE...ADDPARTITION to add new partitions; 3. For HASH or KEY partitions, ADDPARTITION is used to increase the number of partitions and redistribute data; 4. When adding partitions, you must avoid definition conflicts, and operate during low peak periods and backup in advance to ensure data security and system stability.

Aug 08, 2025 pm 03:08 PM

mysql Partition Table

How to use the MIN function in MySQL

TheMIN()functioninMySQLreturnsthesmallestvalueinaset.1.Tofindtheminimumvalueinacolumn,useSELECTMIN(column_name)FROMtable_name;2.WithGROUPBY,itreturnstheminimumpergroup,suchasthelowestsalarybydepartment;3.Itworkswithdatestofindtheearliestdate;4.Combin

Aug 08, 2025 pm 03:05 PM

mysql min function

Optimizing MySQL for Collaborative Editing Applications

Optimizing MySQL to support collaborative editing applications similar to GoogleDocs requires starting from isolation level, pattern design, indexing strategy, etc. First, use the READCOMMITTED isolation level to reduce lock contention and set the global transaction isolation level; second, design event tables to store user operations rather than full document status to avoid row lock conflicts; third, establish (document_id, timestamp) composite indexes and control the number of indexes; fourth, enable deadlock log monitoring and optimize transaction size and execution order; fifth, reasonably use connection pools and application layer caches instead of query cache. These adjustments can improve responsiveness and data consistency under high concurrency.

Aug 08, 2025 pm 02:41 PM

mysql 協(xié)同編輯

Securing MySQL with Privileged Access Management (PAM)

MySQL requires PAM because its default authentication mechanism may have problems such as password sharing, dispersed user management and insufficient auditing in an enterprise environment. 1. PAM can integrate LDAP, Radius or Kerberos to achieve unified authentication; 2. Improve audit capabilities and record login logs; 3. Support multi-factor authentication such as OTP; 4. Control access source and time. When configuring, you need to ensure that the plug-in supports, install the PAM library, create users and configure policy files. When using it, pay attention to fine control of permissions, configuration testing, logging inspection and avoiding circular dependencies.

Aug 08, 2025 pm 12:22 PM

mysql authority management

How to Store JSON Data in MySQL and Query It?

Use MySQL5.7 and above to store and query JSON data directly through JSON data types; 2. Define JSON columns when creating a table and insert legal JSON data, MySQL will automatically verify its validity; 3. Use the -> and -> operators to extract JSON field values, among which ->> can be used to remove string quotations for comparison; 4. Search for JSON content in WHERE clauses through functions such as JSON_CONTAINS, CAST, etc., and note that numerical comparison requires type conversion; 5. Use the JSON_SET, JSON_REPLACE and JSON_REMOVE functions to modify the JSON field; 6. Although it cannot be straightforward

Aug 08, 2025 pm 12:02 PM

mysql query json data

How to fix 'Too many connections' error in MySQL

Checkmax_connectionsandThreads_connectedtoconfirmthelimitandcurrentusage.2.Increasemax_connectionstemporarilywithSETGLOBALorpermanentlyviamy.cnf/my.ini.3.Useconnectionpooling,closeconnectionsexplicitly,andmanagepersistentconnectionsintheapplication.4

Aug 08, 2025 am 11:37 AM

mysql Database Connectivity

How to manage foreign key constraints in MySQL

DefineforeignkeysduringtablecreationusingFOREIGNKEYwithREFERENCESandspecifyONDELETE/ONUPDATEactionslikeCASCADEtomaintainreferentialintegrity.2.AddforeignkeyconstraintstoexistingtablesviaALTERTABLEwithADDCONSTRAINT,ensuringmatchingcolumntypesandindexe

Aug 08, 2025 am 11:26 AM