Video: Dab tsi yog qhov ntsuas thib ob hauv DBMS?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Cov Secondary Index yog ib indexing txoj kev uas nws tus yuam sij tshawb nrhiav qhia qhov kev txiav txim sib txawv ntawm qhov kev txiav txim ua ntu zus ntawm cov ntaub ntawv. Ua pawg qhov ntsuas yog txhais raws li cov ntaub ntawv txiav txim. Multilevel Indexing yog tsim thaum thawj qhov ntsuas tsis haum rau hauv nco.
Tom qab ntawd, dab tsi yog qhov indexes thib ob?
Secondary indexes . A theem nrab index , muab tso yooj yim, yog ib txoj hauv kev kom nkag tau zoo rau cov ntaub ntawv hauv database (thawj) los ntawm kev siv qee cov ntaub ntawv uas tsis yog qhov tseem ceeb (primary).
Ib tug kuj yuav nug, qhov txawv ntawm thawj thiab theem nrab Performance index yog dab tsi? Qhov sib txawv nruab nrab ntawm Thawj Qhov Ntsuas thiab Secondary Index A thawj index yog ib qhov ntsuas nyob rau hauv ib pawg ntawm cov teb uas suav nrog qhov tshwj xeeb thawj qhov tseem ceeb thiab tau lees tias tsis muaj qhov sib npaug. Piv txwv li, a theem nrab index yog ib qhov ntsuas uas tsis yog ib thawj index thiab tej zaum yuav muaj duplicates.
Kuj kom paub yog, dab tsi yog qhov tseem ceeb thiab theem nrab indexing hauv DBMS?
Thawj Index − Thawj qhov ntsuas yog txhais rau ntawm cov ntaub ntawv txiav txim. Secondary Index − Secondary index tej zaum yuav raug tsim los ntawm ib daim teb uas yog tus neeg sib tw tus yuam sij thiab muaj tus nqi tshwj xeeb hauv txhua cov ntaub ntawv, lossis tus yuam sij tsis muaj qhov sib npaug. Ua pawg Index -Clustering qhov ntsuas yog txhais rau ntawm cov ntaub ntawv txiav txim.
Dab tsi yog ntau hom database indexes?
clustered, multi-dimensional clustered, unclustered, tshwj xeeb, tsis muaj cim, b-ntoo, hash, GiST, GIN, tag nrho cov ntawv nyeem, bitmap, partitioned, function-based. Zoo li ntawd txawv systems muaj txawv npe rau tib yam hom ntawm indexes.
Pom zoo:
Qhov ntsuas thib ob hauv Teradata yog dab tsi?
Ib Daim Ntawv Qhia Thib Ob (SI) muaj lwm txoj hauv kev los nkag mus rau cov ntaub ntawv. Tsis zoo li Thawj Index uas tsuas yog txhais tau thaum lub sij hawm tsim lub rooj, Secondary Index tuaj yeem tsim / poob tom qab tsim lub rooj thiab
Dab tsi yog qhov ntsuas qhov ntsuas ntau?
Ib txwm nyiam hom kev tshawb fawb tsim uas tau cuam tshuam cov txiaj ntsig-raws li kev ntsuas kev ntsuas yog kev ntsuas ntau. Kev ntsuam xyuas ntau muaj ntau yam ntawm cov cuab yeej sau cov ntaub ntawv suav nrog kev xam phaj, cov lus nug, thiab kev xeem
Dab tsi yog qhov sib txawv ntawm qhov ntsuas qhov ntsuas thiab qhov ntsuas thib ob?
Primary index: nyob rau hauv ib tug sequentially order file, qhov Performance index uas nws search key qhia cov sequential order ntawm cov ntaub ntawv. Kuj hu ua clustering index. Secondary index: ib qho Performance index uas nws qhov tseem ceeb tshawb nrhiav qhia qhov kev txiav txim sib txawv ntawm qhov kev txiav txim ntawm cov ntaub ntawv. Kuj hu ua non-clustering index
Dab tsi yog qhov ntsuas qhov ntsuas qhov ntsuas qhov ntsuas?
Xav txog nws li no: rhiab heev yog ib qho kev ntsuas ntawm qhov hloov pauv ntawm lub koob yees duab qhov chaw saib uas tsim nyog raws li qhov muaj peev xwm tshawb pom, thiab qhov pib yog qhov ntau npaum li cas ntawm cov lus tsa suab yuav tsum tshwm sim txhawm rau txhawm rau ua rau lub tswb
Dab tsi yog qhov ntsuas thib ob hauv Google Analytics kev xeem?
Raws li Google Analytics kev txhawb nqa, "TheSecondary Dimension feature tso cai rau koj los txheeb xyuas qhov tseem ceeb thiab tom qab ntawd saib cov ntaub ntawv los ntawm qhov thib ob hauv tib lub rooj. Yog tias koj xaiv lub nroog thib ob ntawm Lub Nroog, tom qab ntawd koj pom cov nroog uas muaj kev thauj mus los ntawm qhov chaw pib. "