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Video: Kuv yuav tso tag nrho cov indexes hauv MongoDB li cas?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Rau poob tag nrho mas _id qhov ntsuas los ntawm kev sau, qhia "*". Rau poob ib ib qhov ntsuas , specification los yog qhov ntsuas npe, o qhov ntsuas cov ntaub ntawv specification (tshwj tsis yog cov qhov ntsuas yog ntawv qhov ntsuas ), los yog array ntawm cov qhov ntsuas npe. Rau poob ib ntawv qhov ntsuas , qhia cov qhov ntsuas cov npe es tsis yog cov qhov ntsuas cov ntaub ntawv specification.
Ua raws li qhov no saib, Kuv yuav saib indexes hauv MongoDB li cas?
Rau saib ib daim ntawv teev tag nrho indexes nyob rau hauv ib tug collection MongoDB Compass, nyem rau ntawm lub hom phiaj sau nyob rau sab laug tes pane thiab xaiv cov Index tab.
Qhov thib ob, Kuv yuav poob li cas hauv MongoDB? Txhawm rau rho tawm lossis tso cov ntaub ntawv los ntawm MongoDB, ua raws cov kauj ruam hauv qab no:
- Xaiv cov ntaub ntawv koj xav rho tawm nrog kev pab ntawm USE hais kom ua. Hauv qab no yog cov syntax ntawm USE hais kom ua: siv
- Tso lub database nrog kev pab ntawm db. dropDatabase() hais kom ua. Hauv qab no yog cov syntax ntawm USE hais kom ua: db.
Qhov thib ob, koj yuav tshem tawm qhov Performance index li cas?
Txhawm rau rho tawm qhov ntsuas los ntawm kev siv Object Explorer
- Hauv Object Explorer, nthuav cov ntaub ntawv uas muaj cov lus uas koj xav rho tawm qhov ntsuas.
- Nthuav lub Tables folder.
- Nthuav lub rooj uas muaj qhov ntsuas koj xav rho tawm.
- Nthuav lub Indexes folder.
- Right-click lub Performance index koj xav rho tawm thiab xaiv Delete.
Qhov System indexes hauv MongoDB yog dab tsi?
Index txhawb kev ua tau zoo ntawm cov lus nug hauv MongoDB . Hauv paus, indexes hauv MongoDB zoo ib yam li indexes nyob rau hauv lwm lub database tshuab . MongoDB txhais indexes nyob rau theem sau thiab kev txhawb nqa indexes nyob rau txhua qhov chaw lossis sub-field ntawm cov ntaub ntawv hauv a MongoDB sau.
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