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MySQL ??? ?????? InnoDB ?? ?? ???? ???????. ??, innodb_buffer_pool_size? 16GB? ????? 12G? ?? ?? ??? RAM? 70-80%? ???? ?? ???? 95%? ????????. ??, ?? ?? ? ??, innodb_buffer_pool_instances? 8?? ???? ??? ????. ?? ?? innodb_buffer_pool_dump_at_shutdown ? innodb_buffer_pool_load_at_startup? ????? ?? ??? ? ?? ? ???? ??? ?????. ????? ?? ? ?? ?? ????? ??????
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Hmget? ???? ???? ?? ??? ???? ??? ??????
Hmget? Redis?? ?? ????? ?? ?? ?? ?? ? ?????. 1. ?? ??? ?? ?? ??? ???? ???? ??????. 2. ??? ???? ??? ?? ?? NIL? ??????. 3. ??? hmgetSeyfield1 [Field2 ...], ? : hmgetuser : 1000nameemailage; 4.?? ??? ? ?? ??? ???? ??????, NIL ?? ??????, ???? ??? ??? ??? ?? ?? hget? ?? ??? ????????. 5. ?? ??? ??? ????? ??? ??? ??? ?? ?? ? ??? ?? ?? ? ??? ????? ?????. 6. Python, Node.js ? Go? ?? ?? ???? ?? ?? ??? ????. 7. ??? ?? ? ? ??? ????? ???? ???? ???????.
Sep 11, 2025 pm 01:53 PM
SQL?? ??? ??? ???? ???? ??? ??????
CreateProcedure ?? ???? ??? ??? SQL ?? ??? ?????? ??? ??? ????. 2. ?? ?? ?? (? : @deptname) ? ?? ?? ?? (? : @employeecountoutput)? ???? ??? ??? ??? ?? ? ? ????. 3. ??? ??? ?? ?? ?? ?? (?????? ???? ?? ??)? ???? ??? ?? ??? ?????. 4. ??? ??? ??? ????? ??? ?? ??? ???? ???? ??? ???? ??? ???? ? ????. 5. ?? ??? ?? ??? ?? ???? ?? ????? ???? ?? ? ? ??? ?? ??? ??? ? ????. ?? ??? ??????? ?? ?? ??? ??? ?????? ???? ???? ?? ???????.
Sep 11, 2025 pm 01:25 PM
SQL?? Union Operator? ???? ??
UnioncombinessElectQueryResultsIntSintOingleDistIntSteTwiDdedUplicatedRows, MatchingColumnCounts ? CompatiBledAtAtypesAcrossqueries, whereColumnNamesArdeRivedFromSextect; Forexailt, ComminingsAlesDataFromTwotBikesales _Q1sals
Sep 11, 2025 pm 12:48 PM
MongoDB ????? ???? ???? ??
MongoDB? DocumentValidation? ????? ??? ???? ????, ??? ???? ?? ?? ??, ?? ? ?? ??? ????, $ ? $ ??, $ regex ?? ?? ???? ????? ???? ? ? ??? ? ????. ??? ??? ?? ?? ??? ??? ? ????. ValidationLevel? ?? ??? ???? Collmod? ?? ??? ????? ?? ? ? ????.
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phpmyadmin?? SQL ?? ??? ???? ??
thesqlqueryboxinphpmyadminisaccessedviathepmenu'ssqltaborfficificdatabaseortableview.2.toexecutequeries, typeqlc OMMANDSLIKESELECTERUPDATEINTEXTAREA, ENSURETHECORRECTDATABASEISELECTER ?“GO”TORUN.3.3.usefulfeatisintaxhigh
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Oracle Database ?? ? ??????
AdatabaselinkenablesAccessorEmoteOrcledatabaseObjectSasiftheyWerelocal.itstorEscontectionDetailSlikenetworkAddress, username ? password, allowingsqlqueriessuchasselect*from@sales_dbtoexecuteonThoteAnresultsults
Sep 11, 2025 pm 12:16 PM
Navicat ?? ??? ????? ??? ??????
Navicat? ?? ?? ?? ?? ??? ?? ??? ?? ????. ?? ?? ??? ???? ??, ??? ?????? .BAK ?? .SQL ??? ???? ???? ?? ? ??????? ?? ???? ????, ?? ???? ???? ????. ② ???? ??? ? ?? ??? ??? ????. Windows? C : \ Users \ YourSername \ Documents \ Navicatbackup? ????. MacOS? ~/Documents/Navicatbackup? ????. Linux?/home/yourusername/documents/navicatbackup? ????. navicat?? ?? ??? ??? ? ????
Sep 11, 2025 pm 12:12 PM
CSV?? Phpmyadmin ??
tosuccesslymportacsvfileintoadaabaseusingphpmyadmin, ensurethecsproperlyatedandmatchthetablestructure.1.preparethecsv : includecolumneadersinthefirstowneded, useconsistentdelimiters (inconsictentdelimiters)
Sep 11, 2025 am 11:53 AM
Navicat?? ?? ?????? ??? ?? ? ? ?????
?, youcanscheduleautomaticdatabasebackupsusingnavicatbyfollowingthesesteps : 1. openyourdatabaseconnectionandright-clickthedesireddatabaseortable, thenselectdumpsqlfileorbackupupdatabase.2.clickThesetAschedtouconfiGureTherTOSTOSTOSTOSTOSTOSTOSTOSTOSTOSTOSTOSTOSTOSTOCN
Sep 11, 2025 am 11:51 AM
???? ??? ????? ???? ???? ??????
??? ?? ???? ?? ????? ????? ?? ? ?? ??? ?? ?? ???? O (1)?? ??? ??? O (n)???. ????? : 1 ??? ?? ? ?? ?? ??? ???? ???? ?? ??? ??????. ???? ???? ??? ?? ?????. 2. ??? ?? ? ?, ?????? ?? ??? ?? ?? ?????. 3. ??? ?? ??, ?? ?? ? ?? ?? ?? ????? ??? ?????? ??? ?? ?? ?? ?? ??? ?? ???? ???? ?? ? ? ????. ??? SET? ???? ?????? ?? ??? ???? ???? ???? ??? ??? ??? ?????.
Sep 11, 2025 am 11:22 AM
MySQL????? ?????? ??
toupdateaview'sdefinitioninmysql, usealtervieworcreateorreplaceviewtomodify.2.toupdatedatathroughaview, useupdate, insert, ordeletestatementsiftheviewisupdatable, whatequiresittonotusedistby, whoal, subqueries, subqueries
Sep 11, 2025 am 11:01 AM
SQL?? CTE? ?? ??? ???? ??
arecursivecteinsqlisusedToQueryHierarchicalDatabyDataBydinAnchormerMerMerMbesTestArtingPoint, arecursiveMemberTheferencesThecteitself, andaunionalltocombinethem, anablingtraversaloftree-likestructuresuchasorganizationalChartSorfilesystems? ??
Sep 11, 2025 am 10:51 AM
MySQL?? ??? ??? ??? ?? ??? ??????
seedescribectoCtoQuickLyViewColumnDetailSlikEname, type, andkeyInfo.2.QueryInfO.2.QueryInformation_schema.columnsforCustomizable, reveralmetAdata.3.useshOwReatEtableTeSeethefullTableCreationSql.4.usshowindextoreTreveInformation.
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