Video: Dab tsi yog qhov Performance index siv rau ntau qhov chaw hauv MongoDB?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
cov indexes
Ntawm no, MongoDB puas tuaj yeem siv ntau qhov indexes?
MongoDB tuaj yeem siv kev sib tshuam ntawm ntau indexes ua kom tiav cov lus nug. Feem ntau, txhua qhov ntsuas kev sib tshuam muaj ob indexes ; txawm li cas los xij, MongoDB tau ua hauj lwm ntau /nested qhov ntsuas kev sib tshuam los daws cov lus nug.
Tom qab ntawd, lo lus nug yog, uas yog txoj kev siv los tsim kev ntsuas hauv MongoDB? Tsim ib qho Index hauv MongoDB yog ua los ntawm kev siv "createIndex" txoj kev. Cov nram qab no piv txwv qhia li cas ntxiv index rau sau. Cia peb xav tias peb muaj peb cov neeg ua haujlwm sau tib yam uas muaj cov npe ntawm "Employeeid" thiab "EmployeeName".
Cov lus nug tseem yog, qhov twg yog qhov ntsuas tau siv rau ntau qhov chaw?
Taw qhia rau MySQL composite qhov ntsuas Ib qho kev sib xyaw qhov ntsuas tseem hu ua a ntau -kum qhov ntsuas . Cov lus nug optimizer siv qhov sib xyaw indexes rau cov lus nug uas kuaj tag nrho kab hauv qhov ntsuas , los yog cov lus nug uas sim thawj kab , thawj ob kab , thiab lwm yam.
Dab tsi yog kev siv index hauv MongoDB?
Ib Index hauv MongoDB yog cov ntaub ntawv tshwj xeeb uas tuav cov ntaub ntawv ntawm ob peb lub teb ntawm cov ntaub ntawv uas cov qhov ntsuas yog tsim. Index txhim kho qhov nrawm ntawm kev tshawb nrhiav hauv cov ntaub ntawv vim tias tsis yog kev tshawb nrhiav tag nrho cov ntaub ntawv, kev tshawb fawb tau ua nyob rau hauv indexes uas tuav ob peb teb xwb.
Pom zoo:
Dab tsi yog qhov Performance index tawm ntawm kev zam zam hauv Java?
Index Out of Bound Exception. Index Out of Bound Exception yog qhov Unchecked Exception uas tshwm sim ntawm kev khiav haujlwm yuam kev. Qhov no tshwm sim vim qhov tsis raug parameter dhau mus rau ib txoj hauv kev hauv cov cai. Lub java Compiler tsis kuaj qhov yuam kev thaum lub sij hawm muab tso ua ke ntawm ib qho kev pab cuam
Qhov txawv ntawm qhov chaw nyob thiab qhov chaw nyob yog dab tsi?
Qee zaum, 'txoj kev chaw nyob' hais txog koj lub cev qhov chaw nyob ntawm qib zoo dua hauv nroog. Piv txwv li, '1313Mockingbird Lane', tsis muaj lub nroog lub npe txuas nrog. Tab sis yog, feem ntau nws tsuas yog ib daim ntawv rov qab kom paub qhov txawv ntawm qhov chaw xa ntawv (thaum chiv keeb) thiab tam sim no e-mail chaw nyob, chaw nyob hauv web, IPaddress, thiab lwm yam
Qhov chaw nyob ntawm lub cev thiab qhov chaw nyob qhov chaw nyob yog dab tsi?
Qhov sib txawv yooj yim ntawm Logical thiab lub cev chaw nyob yog qhov chaw nyob Logical yog tsim los ntawm CPU hauv kev xav ntawm ib qho kev pab cuam. Ntawm qhov tod tes, qhov chaw nyob ntawm lub cev yog qhov chaw nyob uas muaj nyob hauv lub cim xeeb. Cov txheej txheem ntawm txhua qhov chaw nyob uas tsim los ntawm CPU fora program hu ua Logical Address Space
Qhov txawv ntawm qhov chaw kub thiab qhov chaw txias yog dab tsi?
Thaum lub chaw kub kub yog ib daim qauv ntawm cov chaw khaws ntaub ntawv nrog tag nrho koj cov khoom siv kho vajtse thiab software ua haujlwm nrog koj lub xaib thawj zaug, qhov chaw txias tau muab tshem tawm - tsis muaj server hardware, tsis muaj software, tsis muaj dab tsi. Kuj tseem muaj qhov chaw sov uas nyob nruab nrab ntawm qhov chaw kub thiab qhov chaw txias los ntawm cov khoom siv
Qhov txawv ntawm qhov chaw nyob sib txuas lus thiab qhov chaw nyob ruaj khov yog dab tsi?
Qhov chaw nyob xa ntawv yog chaw nyob sib txuas lus piv txwv li qhov koj nyob tam sim no. & chaw nyob Apermanent yog ntawm koj cov ntaub ntawv yog sau rau ntawm koj daim ntawv pov thawj hnub yug & daim npav pov npav. Qhov chaw nyob ruaj khov & kev sau ntawv yuav zoo ib yam lossis txawv ntawm cov ntaub ntawv siv tau