WGU D426 OA DATA MANAGEMENT FOUNDATIONS LATEST OBJECTIVE ASSESSMENT PREP TEST BANK WITH 300 REAL EXAM QUESTIONS WITH CORRECT ANSWERS D426 PREP FOR OA & PRE-ASSESSMENT

WGU C175/D426 DATA MANAGEMENT
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FOUNDATIONS OAEXAM 2023- g g



2024 ACTUAL EXAM 2 LATEST VERSI
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ONS 300QUESTIONS AND CORRECT A
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NSWERS (100% VERIFIED ANSWERS)
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VERSIONgA


Whatgdoesgmodalitygrefergto?gHowgdoesgitgappeargongERgdiagram?g-gANSWER-
gRefersgtogthegMINIMUMgnumbergofgtimesganginstancegingonegentitygcangbegassoci

atedgwithginstancegofganothergentityg(minima)
Appearsgasgag0gorg1gongthegrelationshipgline,gnextgtogcardinality

Define:gReferentialgIntegrityg-gANSWER-
gRequiresgthatgALLgforeigngkeygvaluesgmustgeithergbegfullygNULLgorgmatchgsomeg

primarygkeygvalue

4gWaysgReferentialgIntegritygcangbegviolated:g-gANSWER-
g1.gPrimarygkeygisgupdated

2. Foreigngkeygisgupdated
3. RowgcontaininggprimarygkeygisgDELETED
4. RowgcontaininggforeigngkeygisgINSERTED

4gActionsgtogCorrectgReferentialgIntegritygViolation:g-gANSWER-g1.gRESTRICTg-
grejectsganginsert,gupdate,gorgdelete

2. SETgNULLg-gsetsginvalidgforeigngkeysgtognull
3. SETgDEFAULTg-gsetsginvalidgforeigngkeysgtogagdefaultgprimarygvalue
4. CASCADEg-gpropagatesgprimarygkeygchangesgtogforeigngkeys

Whatgisgangimportantgaspectgtogreferentialgintegrity?g-gANSWER-
greferencegtogdatagingonegrelationgisgbasedgongvaluesginganothergrelation



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,Whatgisgagbroadgdefinitiongofgdata?g-gANSWER-
gRawgfactsgcapturedgongprintedgorgdigitalgmedia




Whatgaregdata?g-gANSWER-
gFactsgthatgaregcollectedgandgstoredgingagdatabasegsystem




Whatgisgagdetermininggcharacteristicgofgunstructuredgdata?g-gANSWER-
gItgdoesgnotgfollowgagdatagmodel




Whatgisgtruegaboutgflatgfiles?g-gANSWER-g-
gTheygcontaingnoginternalghierarchicalgorganization




Howgweregdatagretrievedgbeforegdatabasegmanagementgsystems?g-gANSWER-
gSequentiallygfromgsimplegfiles




Whatgisgangattributegorggroupgofgattributesgthatguniquelygidentifygagtuplegingagrelatio
n?g-gANSWER-gPrimarygKey

Whatgisgnecessarygforgagprimarygkeygingonegrelationgofgagdatabasegtogmatchgwithgitsg
correspondinggforeigngkeyginganothergrelationgofgthegsamegdatabase?g-gANSWER-
gAgdomaingofgvalues



Whatguniquelygidentifiesgeachgentitygingagcollectiongofgentitiesgbutgisgnotgthegprimar
ygkey?g-gANSWER-gAlternategKey

Whatgisgthegtermgforgagsetgofgcolumnsgingagtablegthatgcanguniquelygidentifyganygrec
ordgingthatgtablegwithoutgreferringgtogothergdata?g-gANSWER-gCandidategKey

Whatghappensgtogthegoriginalgdatagingdatabasegindexing?g-gANSWER-
gItgisgcopiedgtogthegindex




Whygaregindexesgcreatedgingagphysicalgdatabasegdesign?g-gANSWER-
gTogretrievegdatagDIRECTLYgusinggagpointer




Whygisgangindexgcreatedgongagdatabasegcolumn?g-gANSWER-
gTogoptimizegdatagretrievals




Define:gFunctionalgDependencyg-gANSWER-
gEachgvaluegofgagcolumn grelatesgtogatgMOSTgonegvaluegofganothergcolumn

,Dependencegofgonegcolumngonganother

, Whatgtermgisgusedgtogdescribe:gagvaluegofgonegparticulargattributegassociatedgwithgag
specificgsinglegvaluegofganothergattribute?g-gANSWER-gFunctionalgDependency

Rules/AppearancegofgFirstgNormalgFormg-gANSWER-g-gAllgnon-
keygcolumnsgdependgongprimarygkey
- Eachgtablegcellgcontainsgonegvalue
- Agtablegwithgnogduplicategrows

Rules/AppearancegofgSecondgNormalgFormg-gANSWER-g-gWhengallgnon-
keygcolumnsgdependgongthegWHOLEgprimarygkey
- Mustgbeging1NF
- Non-keygcolumngcangnotgdependgongjustgonegpartgofgagcompositegkeyg-gagsingle
g primarygkeygisgautomaticallyging2NF




Rules/AppearancegofgThirdgNormalgFormg-gANSWER-g-gAllgnon-
keygcolumnsgdependgONLYgongthegprimarygkey
- Tablesgaregtotallygfreegofgdatagredundancy

Whatgaregtheg4gwaysgthatgoperationalgandganalyticalgdatabasesgdiffer?g -gANSWER-
- Volatgility
- Detail
- Scope
- History

Define:gVolatility;gHowgitgappliesgtogOperational?gAnalytical?g-gANSWER-g-
Databasegupdatesgingrealgtime
-gOperationalgDatagisgVolatile
- AnalyticalgDatagisgNOTgVolatile

Define:gDetail;gHowgitgappliesgtogoperationalgandganalyticalgDB?g-gANSWER-g-
gAgdatabasegthatgkeepsgrecordgofgindividualgtransactions;glinegitems

- Operational:gDetailed
-gAnalytical:gDetailed

Define:gScope;gHowgitgappliesgtogoperationalgandganalyticalgDB?g-gANSWER-g-g
Howgfargagdatabasegcangreach
Operational:gincompatible
Analytical:

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