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- theleft mostprefixruleincompositeindexesmeansqueriesmeansqueriesmustreencethelefteleftesteleft MostcolumnstousetheEdexefficially.forexample, anindexon (last_name, first_name, email) helpqueriesfilteringonlast_name, last_nameandfirst_name, howlthreecol, whowertefilter
- MySQL ???? . ??? ??? 557 2025-06-12 10:36:12
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- InnoDB ?? ?? ??? ??????
- Innodbbufferpool? ??? MySQL ?? ? ?? ??? ????? ????. ??? ?? ????? ???? ????? ?? ??? ??? ?? ??? ????? ??? I/O ??? ????. 1. BufferPool? ??? ???? ? ?? ???? ??? ?????? ??? ???? ??? ????. 2. ??? ????? ??? ?? ??? ??? ?? B- ?? ??? ?? ??? ??? ?????. 3. ?? "?? ???"? ???? ???? ??? ????? I/O? ??? ?? ??? ??????. 4. ?? ??? ??? ??? ?? ?? ?? ??? ???? 50% ~ 80%? ???? ?? ????. 5. ????? ?? ???? ?? innodb_buffer_pool_size? ?? ???? ??? ??? ? ????.
- MySQL ???? . ??? ??? 757 2025-06-12 10:28:20
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- MySQL ???? ?? (binlog)? ???? ??? ??????
- MySQL? ?? ?? (Binlog)? ?????? ?? ??? ???? ?? ???? ??? ??, ??? ???? ?? ? ??? ?? ?????? ?????. 1. Binlog? ??, ????, ?? ?? ?? ???? ???? ?? ?? ???? ????? ?? ?? ????? ???? ?? ??? ?? ?????. 2. ?? ??? ??? ????. ?? ??? ?? ??? ??, ??? ???? ?????? ??? ???? ?? ?? ? ?? ?? ??? ???? ?? ?? ???? ???? ? ?????. 3. binlog ???? ?? ???? ?? ?, ?? -ID, binlog_format ? expire_logs_day? ???????.
- MySQL ???? . ??? ??? 974 2025-06-11 15:41:11
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- Select? ??? ????? ... ????? ??
- themainpursuroseofselect ... forupdateistolockselectedrowsdurnationationtopreventothessionstiptransictionsictioncompletescompendeStranscompypleteStureStureSconscomeNverentEvernmentsSuchasbankingandinventorySystems1itplaces levellocksalk
- MySQL ???? . ??? ??? 836 2025-06-11 15:37:11
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- ? ????? ?????? ???? ?? ?? ??? ??? ? ????. 1. ?? ? ?? : ? ????? ???? ??? ???? ?? ????? ???? ????? ?? ???? ?? ?? ?? ??? ?????. 2. ?? ??? ?? ?? : ?? ??? ?? ??? ?? ??? ???? ?? ? ??????? ?? ??? ??????, ?? ?? ??? ???? ??? ? ????. 3. ?? ?? ?? : ???? ?? ? ?? ????? ? ?? ??? ? ??? ??? ???? ?? ? ?? ? ??? ??? ??? ????. 4. ??? ??? ? ?? ?? : ???? ?? ????? ?? ?? ??? ???? ?? ???? ??? ?? ?? ???? ??? ? ????. ??? ?? ??? ??? ?? ??? ??? ?? ????? ???????.
- MySQL ???? . ??? ??? 713 2025-06-11 15:33:10
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- MySQL ??? ?? SSL/TLS ???? ????? ??? ??????
- MySQL? SSL/TLS ??? ??? ????? ??? ??? ????? ?? ? ? ????. ?? ??? ??? ????. 1. MySQL ??? SSL? ????? ???? ShowVariables like'Have_ssl '? ?? ?? ?? ??? ??????. 2. PEM ?? ??? ?? (ca.pem, server-cert.pem, server-key.pem)? ??????. 3. MySQL ?? ??? ???? [MySQLD] ??? SSL-CA, SSL-CERT ? SSL-KEY ??? ???? ???? ?? ??????. 4. ?????? SSL? ????? ???? CreateUser? ??????.
- MySQL ???? . ??? ??? 536 2025-06-11 15:29:10
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- Windows/Linux? MySQL 8.0? ???? ??? ??????
- MySQL 8.0? ???? ??? ??? ??? ???? ?????? ???? ????. Windows?? MSI ?? ???? ???? ?? ????. ???? ?? ??? ????, ??? ??, ?? ?? ??, ?? ???? ??, ??? ?? ??? ? ?? ?????? ????? Zip ??? ???? ???? ??? ?????. Linux (? : Ubuntu)? APT? ?? ???? ??? ??? ?????? ?? ??, ?? ???? ??, ??? ?? ?? ? ?? ?? ??? ???? ????. ?? ???? ????, ?? ????? ????, ?? ???? ???, ???? ????, ?? ??? ???? ?? ?? ? ?? ?? ??? ????? ?? ? ???? ??? ???????.
- MySQL ???? . ??? ??? 1146 2025-06-11 15:25:11
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- MySQL ??? : ?? ?? ??? ????
- mysqltriggersshouldBenamedUsingAlrscructuredConvention : 1) prefixwith'trg_'or'trigger _ ', 2) threeTeAblename, 3) specifyTheEventType (??, ????, ??), 4) indicateTiming (perectorAfter); forexample,'trg_tbl_user _URGITER '
- MySQL ???? . ??? ??? 921 2025-06-06 00:14:31
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- MySQL ??? : ??? ?? ???? ???? ? ? ?????
- ?, youcandisabletriggersinmysqlusingtwomethods.1) 1) setauser-definedvariabletocontroltriggerexecution : useetet@disable_triggers : = true; preveroperations ? disable_triggers : = false; tore-enable.2) renametriggerstesmporally : useremetriggermy_triggersmporally
- MySQL ???? . ??? ??? 412 2025-06-06 00:14:10
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- MySQL Blob : GIF ???? ???? ???
- GIF ???? Blob ??? ???? MySQL? ?? ? ? ????. 1) ??? ??? ??? Longblob? ???? GIF ???? ??????. 2) ???? ?? GIF ??? ?? ??????. 3) ?? ? ?? ?? ???? ?? ?? ?? ?? ??? ???? ?? ????. 4) ???? ???? ???????? GIF? ???? ??????. 5) ??? ?? ?? ?? ? ??? ??????.
- MySQL ???? . ??? ??? 551 2025-06-06 00:13:50
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- MySQL ??? : ??? ???? ??? ?????????
- ??? ??? ???? QLAREPOWERFOFORAUTOMATINGDATABASEOPERATIONS ? BUTYREQUERCAREFULMANEMATIMATION.1) theCanimPactperformanceBysLowingDownOperations, SoprofingAndAbingArcucial.2) ???, ???? ?????
- MySQL ???? . ??? ??? 527 2025-06-06 00:13:30
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- MySQL : ?? ??????? ??? ??? ??? ???? ??? ??????
- MySQL?? ?? ??????? ??? ??? ??? ???? ?? Char, Varchar, Text ? Blob? ???????. 1. ??? ?? ??? ?? ?? ?? ???? ?????. 2. varchar? ???? ?? ?? ?? ???? ?????. 3. ???? ???? ??? ??? ? ???? ?? ? ???? ?????. 4. ??? ? ??, ???? ? ??? ???? ???? ?? ? ?? ?? ??? ????? ???????.
- MySQL ???? . ??? ??? 1101 2025-06-06 00:11:40
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- MySQL ??? : ?? ?? ???? ??? ? ?????
- ???, youcannotusetriggersforeverythinginmysql.triggersareidealformainingdataintegrityandautomatingtaskslikeloggingstockupdates, buttheycanleadtoperformanceSuesandcomplexifiedforheaporationsEnestedLogic.usethemforsimporsimporsimporsimporsealway
- MySQL ???? . ??? ??? 337 2025-06-05 00:14:40
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- MySQL ??? : ???? ?? ???? ?? ? ?????
- ?, mysqltriggerscancallothertriggers, butcarefulmanagementsneededtoavoidissuesinfiniteloopsandperformanceimpacts.1) beareofcascadingtriggersandusemysql'ssrecursiondepthlimit.2) theper theper heper headovermultipletrgergerexecutust
- MySQL ???? . ??? ??? 266 2025-06-05 00:09:10
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