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Technical Articles

Database

Setting Up MySQL Group Replication for Distributed Systems

To build MySQLGroupReplication, it is necessary to meet the conditions such as version, primary key, network, etc.; configure parameter files; create a copy user and start group replication; pay attention to problems such as missing primary keys, split brains, and read-only mode. 1. Ensure MySQL5.7 or 8.0, GTID is enabled, InnoDB has primary keys, network interoperability, and configuration replication users; 2. Configure server_id, GTID, and group_replication parameters in my.cnf, the group names of each node are the same, and all nodes are listed; 3. Create a repl_user user and grant permissions, boot on one node, and other nodes execute the startup command; 4. Pay attention to the missing primary key, causing the insertion to fail.

Aug 07, 2025 am 04:54 AM

How to find the last run time of a stored procedure in SQL?

Thereisnobuilt-inwaytoseethelastexecutiontimeofastoredprocedureunlessloggingwasproactivelysetup.2.Usesys.dm_exec_procedure_statstogetthelastexecutiontimefromtheplancache,butonlyiftheprocedureisstillcachedandnotclearedduetorestartsormemorypressure.3.I

Aug 07, 2025 am 04:53 AM

How to use the SQL Beautifier tool?

It is actually not difficult to use SQLBeautifier tools, the key is to understand its basic functions and usage methods. 1. To start formatting, just copy the SQL code and paste it in the tool input box, click the "Format" button or drag the file to import; 2. You can customize the format style, such as keyword case, indentation method, field arrangement and alignment, etc.; 3. When you need to frequently process a large number of files, protect sensitive data, or integrate into the development environment, it is recommended to use local tools; 4. After formatting, you should check structural errors, verify production environment logic, and confirm that the comments have not been deleted or misplaced.

Aug 07, 2025 am 03:47 AM

What is the MySQL event_scheduler and how to enable it?

TocheckiftheMySQLevent_schedulerisenabled,runSHOWVARIABLESLIKE'event_scheduler';possiblevaluesareON,OFF,orDISABLED.2.Toenableittemporarily,useSETGLOBALevent_scheduler=ON;thislastsuntilthenextrestart.3.Toenableitpermanently,addevent_scheduler=ONundert

Aug 07, 2025 am 03:30 AM

How do you delete records from a SQL table?

TodeleterecordsfromaSQLtable,usetheDELETEstatementwithaWHEREclausetospecifythecondition,asomittingitwilldeleteallrows.2.Multiplerecordscanbedeletedusingbroaderconditionswithoperatorslike>,IN,orLIKE,suchasDELETEFROMusersWHEREage>65.3.Toremoveall

Aug 07, 2025 am 01:41 AM

How to edit a record directly in the Navicat grid view?

You can edit data directly in Navicat's grid view, but the prerequisites must be met and followed by steps. 1. First make sure that you have entered the edit mode, click the "Edit" button of the toolbar or right-click to select "EditRecord"; 2. Click the cell in the grid view to modify the content, press Enter or switch the cell to confirm the changes, and double-click the selection option in the ENUM type field; 3. After modification, you must save it manually (Ctrl S or click the Save button), otherwise switching the tab will cause the changes to be lost; 4. If you cannot edit, possible reasons include no primary key on the table, insufficient user permissions, unupdated view or database type restrictions. The editing function is greatly affected by the table structure and permission settings, so you need to pay attention to these key points when operating.

Aug 07, 2025 am 01:31 AM

What security features does Navicat offer?

Navicatoffersmultiplebuilt-insecurityfeaturestoprotectdataandconnections.1.ItsupportsSSL/TLSencryptionforsecuredatabaseconnections,allowscertificateverification,andenablesenforcementofSSLmodes.2.Passwordsarestoredencrypted,accessisbasedonexistinguser

Aug 07, 2025 am 12:57 AM

How to connect to MySQL using Java with JDBC

ConnectingtoMySQLusingJavawithJDBCisacommontaskwhenbuildingJavaapplicationsthatinteractwithdatabases.Here'sastep-by-stepguidetohelpyouestablishaconnectionproperly.1.AddtheMySQLJDBCDriver(Connector/J)Beforeyoucanconnec

Aug 07, 2025 am 12:04 AM

MySQL Database Performance Tuning for Specific Workloads

Database performance tuning needs to be focused on business scenarios. 1. The OLTP scenario needs to increase innodb_buffer_pool_size, enable adaptive hash index, adjust log refresh strategy, use connection pools and design index reasonably; 2. The OLAP scenario should improve sorting and connection buffers, reasonably partition, use materialized views and optimize query statements; 3. InnoDB is recommended for writing multiple scenarios, adjust IO parameters, merge write operations, turn off automatic submission and monitor log files.

Aug 06, 2025 pm 06:07 PM

Optimizing MySQL for Customer Relationship Management (CRM)

TooptimizeMySQLperformanceforaCRMsystem,focusonindexingstrategies,schemadesignbalance,andqueryefficiency.1)Useproperindexingbyanalyzingfrequentqueries,addingindexesonWHEREclausecolumns,JOINkeys,andORDERBYfields,andconsideringcompositeindexeswheremult

Aug 06, 2025 pm 06:04 PM

mysql crm

How to use the COUNT function in MySQL

COUNT(*)countsallrowsincludingNULLs,COUNT(column)countsnon-NULLvalues,andCOUNT(DISTINCTcolumn)countsuniquenon-NULLvalues;usewithWHEREtofilter,GROUPBYtogroupresults,andHAVINGtofiltergroups,ensuringaccuratedataanalysisinMySQL.

Aug 06, 2025 pm 05:58 PM

How to set session variables in MySQL?

To set MySQL session variables, use the SETSESSION or SET commands; 1. Use SETSESSIONvariable_name=value; or abbreviated as SETvariable_name=value; both are equivalent; 2. Common examples include setting the time zone SETSESSIONtime_zone=' 00:00'; adjusting the maximum allowable packet size SETSESSIONmax_allowed_packet=67108864; and controlling automatic submission of SETSESSIONautocommit=0; 3. SET, SETSESSION and SETLOCAL are in the session

Aug 06, 2025 pm 05:46 PM

mysql

How to update data in a table in MySQL

To update data in MySQL table, you must use the UPDATE statement and ensure that the WHERE conditions are included to avoid accidental modification of all rows; 1. Update a single row: Modify a specific record with precise conditions (such as id=1); 2. Update multiple columns: Specify multiple columns and values in the SET clause; 3. Update multiple rows: Use conditions that match multiple records (such as email includes.com); 4. Use LIMIT to limit the number of rows to be updated (optional, commonly used for testing); 5. Security suggestions: Always backup data, test conditions with SELECT first, and use transactions for rollback; Common errors include omission of WHERE clauses, unclear conditions and unverified results; in short, be sure to operate with caution to ensure that the update is accurate and recoverable.

Aug 06, 2025 pm 05:18 PM

The Complete SQL Course: From Basic Queries to Advanced Database Management

StartwithbasicSELECTqueriesusingFROM,WHERE,ORDERBY,andLIMIT,andpracticefilteringwithDISTINCT,BETWEEN,IN,LIKE,andNULLhandling.2.Useaggregatefunctions(COUNT,SUM,AVG,MIN,MAX)withGROUPBYtosummarizedataandapplyHAVINGtofiltergroupedresults.3.Jointablesusin

Aug 06, 2025 pm 05:06 PM