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Technical Articles

Database

What are the best practices for writing MySQL triggers?

Keeptriggerssimpleandfocusedbyperformingasingletaskanddelegatingcomplexlogictostoredproceduresorapplicationcode,ascomplextriggersarehardertodebugandtest.2.Avoidrecursiveorcascadingsideeffectsbypreventinginfiniteloopsthroughcarefuldesignandthoroughtes

Aug 05, 2025 am 08:25 AM

Best Practices mysql trigger

Optimizing MySQL for Real-time Stock Market Data

TooptimizeMySQLforreal-timestockmarketdata,focusonthefollowingsteps:1)UseInnoDBasthestorageenginefortransactions,crashrecovery,androw-levellocking,andenableinnodb_file_per_table;2)Designefficientindexes,especiallyacompoundindexon(symbol,timestamp),an

Aug 05, 2025 am 08:24 AM

Leveraging MongoDB Atlas Search for Powerful Full-Text Search Capabilities

CreateadeclarativeAtlasSearchindexusingJSONtospecifyfieldslikename,description,andcategorywithdynamic:falseforcontrol.2.Usethe$searchaggregationstageinsteadof$match,enablingtextsearchacrossspecifiedfieldswithrelevancescoring.3.Boostrelevancebyassigni

Aug 05, 2025 am 08:21 AM

How do you find the last inserted identity value in SQL?

Tofindthelastinsertedidentityvalue,usethedatabase-specificfunction:1.SQLServer:SCOPE_IDENTITY()issafestasitreturnsthelastidentityvaluewithinthesamescope,avoidingissueswithtriggers;2.MySQL:LAST_INSERT_ID()returnsthelastauto-incrementvalueforthecurrent

Aug 05, 2025 am 07:31 AM

Implementing MySQL Read-Write Splitting for Performance

MySQL read and write separation reduces the load on the main library and improves performance by distributing read requests to the slave library. 1. Reading and writing separation depends on the master-slave replication mechanism. The master library processes write operations and records binlog. The slave library plays the log synchronized data. Pay attention to the delay and consistency issues; 2. The implementation methods include application-level manual routing, middleware proxy (such as MyCat, ProxySQL) and ORM framework support, each with its advantages and disadvantages; 3. Precautions include avoiding dirty reads, reasonably managing connection pools, monitoring master-slave delays, reasonably allocating read requests and conducting sufficient tests and verification to ensure data consistency and system stability.

Aug 05, 2025 am 06:47 AM

How to find and remove orphaned records in MySQL?

Tofindorphanedrecords,useaLEFTJOINtoidentifychildrecordswithoutvalidparentreferences,suchas:SELECTo.*FROMordersoLEFTJOINusersuONo.user_id=u.idWHEREu.idISNULL.2.Todeleteorphanedrecords,useDELETEwithLEFTJOINorNOTEXISTS,forexample:DELETEoFROMordersoLEFT

Aug 05, 2025 am 06:35 AM

What is the Purpose of the Binary Log in MySQL?

ThebinaryloginMySQLiscriticalforreplication,recovery,andauditing;1.Inreplication,themasterrecordschangesinthebinarylog,andslavesuseI/OandSQLthreadstocopyandapplytheseeventsforsynchronization;2.Forpoint-in-timerecovery,itenablesrestoringdatatoaspecifi

Aug 05, 2025 am 06:09 AM

From Excel to SQL: A Transitional Guide for Data Professionals

SQLrequiresamindsetshiftfrominteractivespreadsheetstodeclarativequeries;2.Excel’sFILTER,VLOOKUP,SUMIF,pivottables,andduplicateremovalmaptoSQL’sWHERE,JOIN,GROUPBYwithaggregates,conditionalaggregation,andDISTINCT/ROW_NUMBER();3.SQLexcelsinhandlinglarge

Aug 05, 2025 am 06:08 AM

What is the difference between OLTP and OLAP systems in the context of SQL?

OLTPisforreal-timetransactionprocessing,whileOLAPisforcomplexdataanalysis;2.OLTPusesnormalizedschemastoensureintegrity,whereasOLAPusesdenormalizedstarorsnowflakeschemasforqueryspeed;3.OLTPhandlesshort,frequentquerieslikeinsertsandupdates,whileOLAPrun

Aug 05, 2025 am 05:57 AM

How to implement a tagging system in a MySQL database?

Useamany-to-manyrelationshipwithajunctiontabletolinkitemsandtagsviathreetables:items,tags,anditem_tags.2.Whenaddingtags,checkforexistingtagsinthetagstable,insertifnecessary,thencreatemappingsinitem_tagsusingtransactionsforconsistency.3.Queryitemsbyta

Aug 05, 2025 am 05:41 AM

mysql

How to change WordPress URL in phpMyAdmin

AccessphpMyAdminviayourhostingcontrolpanelandselectthecorrectWordPressdatabase.2.Locatethewp_optionstable,theneditthesiteurlandhomerows,updatingtheiroption_valuetothenewfullURL(e.g.,https://newdomain.com),savingeachchange.3.Ifmigratingdomains,avoiddi

Aug 05, 2025 am 05:33 AM

What are analytical functions in Oracle?

AnalyticalfunctionsinOraclereturnmultiplerowspergroupwhilepreservingrowdetail,enablingadvancedSQLanalyticswithoutcollapsingtheresultset.1.TheyoperateoveradefinedwindowusingtheOVER()clause,whichsupportsPARTITIONBYtogroupdata,ORDERBYtosortrowswithinpar

Aug 05, 2025 am 05:05 AM

How to check the remaining time to live for a key using TTL?

In Redis, use the TTL command to view the remaining survival time of the key. 1.TTLkey_name returns the remaining expiration time of the key. If the return integer greater than or equal to 0 indicates the remaining number of seconds; -1 indicates that the expiration time has not been set; -2 indicates that the key does not exist. 2. Modifying the key value will not reset the expiration time, and will only be updated if the expiration parameters such as EXPIRE are reset. 3. If millisecond precision is required, you can use the PTTL command. 4. TTL is often used for cache monitoring, current limiting mechanisms and debugging cache behaviors, such as for viewing the remaining time limit when the login fails to be limited. Mastering TTL and PTTL can effectively manage the Redis key life cycle.

Aug 05, 2025 am 04:58 AM

Best Practices for Managing Large MySQL Tables

When dealing with large tables, MySQL performance and maintainability face challenges, and it is necessary to start from structural design, index optimization, table sub-table strategy, etc. 1. Reasonably design primary keys and indexes: It is recommended to use self-increment integers as primary keys to reduce page splits; use overlay indexes to improve query efficiency; regularly analyze slow query logs and delete invalid indexes. 2. Rational use of partition tables: partition according to time range and other strategies to improve query and maintenance efficiency, but attention should be paid to partitioning and cutting issues. 3. Consider reading and writing separation and library separation: Read and writing separation alleviates the pressure on the main library. The library separation and table separation are suitable for scenarios with a large amount of data. It is recommended to use middleware and evaluate transaction and cross-store query problems. Early planning and continuous optimization are the key.

Aug 05, 2025 am 03:55 AM

mysql Database management