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mongbisidealfore-commerceduetoitsflexibledocumentmodel, chema-freejson-likedocuments? ???? ???? ????, itsupportsembeddataandarraysforproductvariants, ??, ? ??, while-indexingenhanceseperformanceOnfiel
Sep 05, 2025 am 06:46 AM
SQL? ID ???? ???? ???? ???? ??
ToinsertdataintoaSQLServertablewithanidentitycolumn,omittheidentitycolumnintheINSERTstatementforautomaticvaluegeneration,oruseSETIDENTITY_INSERTONtotemporarilyallowexplicitvalues,insertthedesireddataincludingtheidentityvalue,thenturnitoffwithSETIDENT
Sep 05, 2025 am 06:37 AM
SQL ?? ??? ????? ??? ??????
indexeSeffecticallyCreatingThemonwhere, Join, Orderby ? GroupByColumns, compositeIndexesformulti-columnfilters and avoidingover-indexingTeorduceWriteOverHead.2.OpTimizeQueryStructureBySelectingOnlyneedDcolumns, FipingFunctionSonIndExedColumns? ?????
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phpmyadmin?? ??????? ???? ??
Tocopyadatabaseinphpmyadmin, firstcheckifte "CopyDatabaseto"featureTheperationStab, selectSourcedatabase, enterthenewdatabaseMame, create/dropoptions, andclickgo.2.ifthatoptionisunavailab? ??????
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Oracle?? ???? ???? ??
usealterindexindex_namerebuildtorebuildanindex, whitesanewcompactversionandreplacestheoldone;
Sep 05, 2025 am 05:41 AM
MySQL?? ???? ? ??? ?? ??
MySQL ???? ? ??? ???? ? ?? ??? ????. 1. SELTETALE_NAME ?? ?? ??? ??? ?? ?? ??? ??? ??? ??????. 2. showcolumnsfromtable_name? ???? ????? ????? ??? ?????? ? ? ?? ???? ?????. 3. ?? _schema.columns ???? ??????.? ???? ??? ? ??? ???? ?? ?? ??-?? ?? ? ???? ?????? ??? ? ????. ?? ????? ?? ??? ??? ??????.
Sep 05, 2025 am 04:47 AM
WHERE ?? ?? ? ??? ???? ??????
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Sep 05, 2025 am 04:35 AM
MySQL?? ???? ????? ???? ??
formysql5.7.6andlater, usealteruser'username '@'host'Identifiedby'new_password '; 2. forolderversions, useetpasswordfor'username'@'host'= password ( 'new_password'); 3.tochangeyourownpassword, usealuseruser () willifiedsifiedby_password ';
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SQL? ???? ??? ????? ??
identifysLowqueriesusingExplaintOdectFullteCansandineFificentOperations.2.CreateIndexesOncolumnsusedinwhere, ??, andorderByClausestospeedUpdatAretrieval, butavoidover-indexingTopReventSlowningSlowneDexeSformumnfilters
Sep 05, 2025 am 04:26 AM
MySQL?? ?????? ???? ??? ??????
AdbasetSupandConfiguresMysqlinStances? ?? ???, StorageEngines ? ConfigurationParametersTopReverformanceSues.2
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llen? ???? ??? ??? ?? ??? ??????
Llen? Redis?? ??? ??? ?? ?? ???? ?????. ?? ???? O (1)???. ???? llenkey_name ??? ?? ?????. ?? ???? ??? 0? ?????. ? ??? ??? ?? ?? ?? ??????. ???? ??? ??? ???, ?? ? ?? ?? ?????. LPUSH, RPUSH, LTRIM ? ?? ??? ?? ? ??? ??? ? ????.
Sep 05, 2025 am 04:00 AM
phpmyadmin?? ?? ?? ???? ??
TOSETAPRIMARYKEYINPHPMYADMIN, "??"checkBoxWhengingAnewtableOreAtEreclectHolumnandChoose "1 ?"?? "dropdownforexistingTable;
Sep 05, 2025 am 02:52 AM
MySQL ?? ???? : ?? ? ???
MySQL ?? ????? ??? ??? ??? ??? ???? ?? ??? ??? ???? ????. 1. ???? ??? Sysbench (OLTP ???? ???? ??), MySQLSLAP (Lightweight Formal Tool), HammerDB (??? ?????? ?? ???) ? JMeter (Flexible Database Stress Testing); 2. ??? ??? ??? ????? ?? ??? ???? ?? ???? ???? ??? ???? ???? ???????. 3. QPS/TPS, ?? ??, ?? ?? ? ???? ?? ?? ?????? ?????. 4. ??? ??? ??? ??? ???? ???? ???? ???? ???? ????, ?? ???? ????, ?? ? ???? ????, ?? ???? ?? ???? ??????.
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