CS639:DataManagementfor

DataScienceLecture12:NoSql andKeyValue stores

TheodorosRekatsinas

SlidesborrowedbyKathleenDurant

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Today’sLecture

1. IntrotoNoSQL

2. NoSQLAssumptionsandtheCAPTheorem

3. StrengthsandweaknessesofNoSQL

4. Example:MongoDB

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1. IntrotoNoSQL

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TaxonomyofNoSQL

TypicalNoSQLarchitecture

2.NoSQLAssumptionsandtheCAPTheorem

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CAPtheoremforNoSQL

• WhattheCAPtheoremreallysays: Ifyoucannotlimitthenumberoffaultsandrequestscanbedirectedtoanyserverandyouinsistonservingeveryrequestyoureceivethenyoucannotpossiblybeconsistent

• Howitisinterpreted: Youmustalwaysgivesomethingup:consistency,availabilityortolerancetofailureandreconfiguration

CAPtheoremforNoSQL

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Sharding ofdata

ReplicaSets

3.StrengthsandweaknessesofNoSQL

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HowdoesNoSQLvaryfromRDBMS?

BenefitsofNoSQL

BenefitsofNoSQL

DrawbacksofNoSQL

DrawbacksofNoSQL

ACIDorBASE

4.MongoDB

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WhatisMongoDB?

FunctionalityofMongoDB

WhyuseMongoDB?

MongoDB:CAPapproach

MongoDBDatamodel:HierarchicalObjects

SchemaFree

MongoDBFeatures

IndexFunctionality

CRUDoperations

Queryoperations

Aggregatedfunctionality

Mapreducefunctionality

Summary