Video: Qhov txawv ntawm Molap Rolap thiab Holap yog dab tsi?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
ROLAP stands rau Relational Online Analytical Processing. MOLAP stands rau Multidimensional Online Analytical Processing. HOLAP sawv cev rau Hybrid Online Analytical Processing. ROLAP tsis yog vim ib daim ntawv luam ntawm cov ntaub ntawv los khaws cia hauv Cov kev pab cuam txheeb xyuas cov ntaub ntawv folders.
Tsis tas li ntawd, qhov txawv ntawm Rolap thiab Molap yog dab tsi?
MOLAP yog siv rau cov ntaub ntawv tsawg tsawg thiab hauv cov ntaub ntawv no yog khaws cia rau hauv ntau qhov array. Hauv MOLAP , Dynamic multidimensional saib ntawm cov ntaub ntawv yog tsim. Lub ntsiab Qhov sib txawv ntawm ROLAP thiab MOLAP yog, In ROLAP , Cov ntaub ntawv yog nqa los ntawm cov ntaub ntawv-warehouse. Ntawm qhov tod tes, hauv MOLAP , Cov ntaub ntawv yog nqa los ntawm MDDBs database.
Ib yam li ntawd, Rolap piv txwv yog dab tsi? Microsoft Access's PivotTable yog ib qho piv txwv ntawm peb-tiered architecture. Txij li thaum ROLAP siv cov ntaub ntawv sib raug zoo, nws yuav tsum tau ua ntau lub sijhawm thiab / lossis qhov chaw disk los ua qee yam haujlwm uas cov ntaub ntawv ntau yam tsim los rau.
Tsis tas li ntawd, Molap yog dab tsi?
MOLAP (multidimensional online analytical processing) yog online analytical processing (OLAP) uas indexes ncaj qha mus rau hauv cov ntaub ntawv multidimensional. Vim li no, MOLAP yog, rau feem ntau siv, sai dua thiab ntau tus neeg siv teb ntau dua li kev txheeb xyuas kev txheeb xyuas online (ROLAP), qhov tseem ceeb rau lwm txoj hauv kev MOLAP.
Dab tsi yog qhov txawv ntawm OLAP thiab cov ntaub ntawv warehouse?
A cov ntaub ntawv warehouse ua lub repository khaws keeb kwm cov ntaub ntawv uas tuaj yeem siv rau kev txheeb xyuas. OLAP yog Online Analytical processing uas tuaj yeem siv los txheeb xyuas thiab ntsuas cov ntaub ntawv nyob rau hauv ib lub warehouse . Cov lub tsev khaws khoom muaj cov ntaub ntawv los ntawm ntau qhov chaw.
Pom zoo:
Dab tsi yog qhov txawv ntawm qhov sib txawv hauv zos thiab thoob ntiaj teb hauv SQL Server?
Qhov sib txawv hauv zos tau tshaj tawm hauv ib qho kev ua haujlwm whereas Ntiaj teb hloov pauv tau tshaj tawm sab nraum lub luag haujlwm. Cov kev hloov hauv zos tau tsim thaum lub luag haujlwm tau pib ua tiav thiab ploj thaum lub luag haujlwm xaus, ntawm qhov tod tes, Ntiaj teb hloov pauv yog tsim raws li kev tua pib thiab ploj thaum qhov kev pab cuam xaus
Dab tsi yog qhov sib txawv ntawm lub thawv thiab lub thawv ntawv thiab lub thawv ntawv yog dab tsi?
Ib lub thawv thiab cov ntawv nplawm (qee zaum hu ua boxplot) yog ib daim duab uas nthuav tawm cov ntaub ntawv los ntawm tsib lub ntsiab lus. Nyob rau hauv ib lub thawv thiab whisker zajlus: qhov kawg ntawm lub thawv yog lub sab sauv thiab sab quartiles, yog li lub thawv spans lub interquartile ntau yam. qhov nruab nrab yog cim los ntawm ib txoj kab ntsug hauv lub thawv
Dab tsi yog qhov txawv ntawm cov ntaub ntawv hom thiab qhov sib txawv?
Ib qho kev sib txawv yuav tsum muaj cov ntaub ntawv sib txuas nrog nws, piv txwv li nws tuaj yeem muaj cov ntaub ntawv xws li cov lej, lej lej, cov cim thiab lwm yam. Qhov sib txawv ntawm hom Integer khaws cov lej suav thiab tus cim typevariable khaws cov cim tus nqi. Thawj qhov sib txawv ntawm ntau hom ntaub ntawv yog lawv qhov loj me me
Dab tsi yog qhov zoo sib xws thiab qhov txawv ntawm relays thiab PLC yog dab tsi?
Relays yog electro-mechanical keyboards uas muaj coil thiab ob hom kev sib cuag uas tsis yog NO & NC. Tab sis Programmable Logic Controller, PLC yog lub khoos phis tawj me uas tuaj yeem txiav txim siab raws li qhov kev zov me nyuam thiab nws cov tswv yim & tso tawm
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