Firebase data structure and its characteristics

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Firebase data structure and its characteristics nori Jun 2017 @1amageek Hello. #Otemachi Firebase #2 Thank you Yahoo Japan

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About 1amageek System Device Technology LSI design engineer iOS engineer iOS engineer 2017.5 ~ 2015.10 ~ 2009.4 ~ Bio

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Bleu Salada OSS Library Bluetooth Library Firebase Library https://github.com/1amageek AssemblyLine Multitask Library

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Goal

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Goal Current Project

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Goal

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Goal Hello! New Project

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Firebase data structure and its characteristics

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is NoSQL

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UI Atomicity Migration Basically Record Scheme Relationship Durability Cloud Isolation Partition-tolerance Cache Transaction

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≒ RDB

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≒ RDB ❌

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CAP theorem Consistency Availability Partition-tolerance Մ༻ੑ Ұ؏ੑ ෼அ଱ੑ

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Relational database 1. Consistency 2. Availability Bank Stable Network Firebase Realtime Databaseͱ͸ͳΜͳͷ͔ʁ CAP theorem

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Mobile

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Mobile 1. Unstable network 2. Limited resources 3. Development speed

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Mobile RDB X Mismatch

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Firebase realtime database Unstable Network 1. Partition-tolerance 2. Availability CAP theorem

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Mobile Firebase X Cool

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DEMO

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Feed Feed Feed Feed Sample App User Feed Feed Feed Feed Feed Photo Photo Photo Photo Photo

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How to Design Firebase realtime database 1. Scheme less 2. Structure 3. Client side join 4. Denormalization

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Some NoSQLs provide soft scheme functions. Mixed Nested Model Model Scheme less 1. Type safe 2. Validation

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1. Flat structure can flexibly respond to changes Flat Nested Model Structure 2. Nested structure can constitute simple security Model Model Model

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Structure Room { room: { room_00: { message_00: true, message_01: true } }, message: { message_00: { text: "hollo" }, message_01: { text: "hollo" } } } { room: { room_00: { message_00: { text: "hollo" }, message_01: { text: "hollo" } } } } Flat Nested 1. Flat structure can flexibly respond to changes 2. Nested structure can constitute simple security

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Client side join 1. Improve development speed 2. Reduce unnecessary communication

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Client side join User Information Main Contents Reaction count

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Client side join { id: "000000", user: { id: "user_00", name: "1amageek", thumbnailURL: "https://**.jpg" followerUserIDs: ["user_01"], followeeUserIDs: ["user_02"], }, content: { id: "content_00", text: "Hello", imageURL: "https://**.jpg" }, retweetUserIDs: ["user_01", "user_02"], commentUserIDs: ["user_01", "user_02"], likeUserIDs: ["user_01", "user_02"], }

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Client side join { id: "000000", userID: "user_00", contentID: "content_00", retweetUserIDs: ["user_01", "user_02"], commentUserIDs: ["user_01", "user_02"], likeUserIDs: ["user_01", "user_02"], } user: { id: "user_00", name: "1amageek", thumbnailURL: "https://**.jpg" followerUserIDs: ["user_01"], followeeUserIDs: ["user_02"], } content: { id: "content_00", text: "Hello", imageURL: "https://**.jpg" }

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Denormalization RDB Firebase Model Normalization Denormalization 1. Denormalization simplifies queries 2. Improve performance 3. Volume increases

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Summary 1. ͏·͍ 2. ΍͍͢ 3. ͸΍͍

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