Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
Introduction to RethinkDB : Move fast and break...
Search
Jorge Silva
August 06, 2015
Programming
2
260
Introduction to RethinkDB : Move fast and break things
Jorge Silva
August 06, 2015
Tweet
Share
More Decks by Jorge Silva
See All by Jorge Silva
ForwardJS - RethinkDB - Getting Started
thejsj
0
190
ForwardJS - RethinkDB - Advanced Queries
thejsj
1
200
Automatic Failover in RethinkDB
thejsj
0
220
Workshop: Introduction to RethinkDB : Santa Cruz JS
thejsj
1
120
Push databases: A better way to build realtime apps
thejsj
0
120
Data Modeling in RethinkDB
thejsj
4
270
RethinkDB+Angular.js: Building realtime web applications
thejsj
10
30k
Introduction to RethinkDB: 1KE Meetup
thejsj
0
47
Introduction to RethinkDB : Hack Reactor
thejsj
4
410
Other Decks in Programming
See All in Programming
PipeCDのプラグイン化で目指すところ
warashi
1
240
既存デザインを変更せずにタップ領域を広げる方法
tahia910
1
270
ソフトウェア品質を数字で捉える技術。事業成長を支えるシステム品質の マネジメント
takuya542
0
690
ペアプロ × 生成AI 現場での実践と課題について / generative-ai-in-pair-programming
codmoninc
0
630
明示と暗黙 ー PHPとGoの インターフェイスの違いを知る
shimabox
2
420
“いい感じ“な定量評価を求めて - Four Keysとアウトカムの間の探求 -
nealle
0
680
PHP 8.4の新機能「プロパティフック」から学ぶオブジェクト指向設計とリスコフの置換原則
kentaroutakeda
2
710
AI時代のソフトウェア開発を考える(2025/07版) / Agentic Software Engineering Findy 2025-07 Edition
twada
PRO
14
1.7k
Railsアプリケーションと パフォーマンスチューニング ー 秒間5万リクエストの モバイルオーダーシステムを支える事例 ー Rubyセミナー 大阪
falcon8823
4
1k
『自分のデータだけ見せたい!』を叶える──Laravel × Casbin で複雑権限をスッキリ解きほぐす 25 分
akitotsukahara
1
600
プロダクト志向ってなんなんだろうね
righttouch
PRO
0
180
RailsGirls IZUMO スポンサーLT
16bitidol
0
140
Featured
See All Featured
Designing for humans not robots
tammielis
253
25k
Understanding Cognitive Biases in Performance Measurement
bluesmoon
29
1.8k
GraphQLとの向き合い方2022年版
quramy
49
14k
The Myth of the Modular Monolith - Day 2 Keynote - Rails World 2024
eileencodes
26
2.9k
Testing 201, or: Great Expectations
jmmastey
42
7.6k
Exploring the Power of Turbo Streams & Action Cable | RailsConf2023
kevinliebholz
34
5.9k
Cheating the UX When There Is Nothing More to Optimize - PixelPioneers
stephaniewalter
281
13k
Visualizing Your Data: Incorporating Mongo into Loggly Infrastructure
mongodb
46
9.6k
A Tale of Four Properties
chriscoyier
160
23k
Into the Great Unknown - MozCon
thekraken
39
1.9k
実際に使うSQLの書き方 徹底解説 / pgcon21j-tutorial
soudai
PRO
181
53k
Agile that works and the tools we love
rasmusluckow
329
21k
Transcript
Push databases, RethinkDB, and building realtime apps Move Fast and
Break Things San Francisco, CA August 5, 2015
Jorge Silva Developer Evangelist @ RethinkDB @thejsj
Preface The realtime web
Realtime apps
Realtime apps
Realtime apps • More and more apps are built to
be realtime • Users have come to want and expect this behavior in their apps • Building realtime apps is hard
Building realtime apps is hard • You can keep everything
in a single server • You can poll the database to keep track of updates • You can publish updates through a message broker
Building realtime apps is hard • All solutions present a
tradeoff between scalability and complexity • It’s hard to keep track of state in realtime architectures
Introduction What is RethinkDB?
What is RethinkDB? • Open source database for building realtime
web applications • NoSQL database that stores schemaless JSON documents • Distributed database that is easy to scale
Push Database • Subscribe to change notifications from database queries
(changefeeds) • No more polling — the database pushes changes to your app • Reduce the amount of plumbing needed to stream live updates
Push Database • Having your database push changes keeps your
database as the central source of truth • Having a central source of truth simplifies your architecture
Push Database RethinkDB is an excellent database for: • Collaborative
web and mobile apps • Multiplayer games • Streaming analytics apps • Connected devices
Introduction to ReQL RethinkDB Query Language
Introduction to ReQL • ReQL embeds natively into your programming
language • Compose ReQL queries by chaining commands
Anatomy of a ReQL Query r.table("users") .pluck("last_name") .distinct().count() Number of
unique last names
Anatomy of a ReQL Query r.table("users") .pluck("last_name") .distinct().count() Access a
database table
Anatomy of a ReQL Query r.table("users") .pluck("last_name") .distinct().count() Isolate a
document property
Anatomy of a ReQL Query r.table("users") .pluck("last_name") .distinct().count() Consolidate duplicate
values
Anatomy of a ReQL Query r.table("users") .pluck("last_name") .distinct().count() Display the
number of items
Sample ReQL Queries r.table("users") .filter(r.row("age").gt(30)) r.table(“post") .eqJoin(“uId”, r.table(“users”)) .zip() r.table("fellowship")
.filter({species: "hobbit"}) .update({species: "halfling"})
Additional ReQL Features • Geospatial indexing for location- based queries
• Date and time functions • Support for storing binary objects • Execute http requests using r.http
Realtime Updates Working with Changefeeds
Subscribe to change notifications on database queries Changefeeds
r.table("users").changes() Track changes on the users table Changefeeds
Changefeeds • The changes command returns a cursor that receives
updates • Each update includes the new and old value of the modified record
Changefeeds r.table("users").changes() r.table("users") .insert({name: "Bob"}) Changefeed output: { new_val: {
id: '362ae837-2e29-4695-adef-4fa415138f90', name: 'Bob', ... }, old_val: null }
Changefeeds r.table("users").changes() r.table("users") .filter({name: "Bob"}).delete() Changefeed output: { new_val: null,
old_val: { id: '362ae837-2e29-4695-adef-4fa415138f90', name: 'Bob', ... } }
Changefeeds r.table("users").changes() r.table("users") .get("362ae837-2e29-4695-adef-4fa415138f90") .update({name: "Bobby"}) Changefeed output: { new_val:
{ id: '362ae837-2e29-4695-adef-4fa415138f90', name: 'Bobby' }, old_val: { id: '362ae837-2e29-4695-adef-4fa415138f90', name: 'Bob' } }
Changefeeds r.table("players") .orderBy({index: r.desc("score")}) .limit(3).changes() Track top three players by
score Chain the changes command to an actual ReQL query:
Questions http://questions.rethinkdb.com
Summary • Keeping track of state in realtime apps is
hard • RethinkDB solves this problem by pushing changes to your app • In the future, we'll see more database that use the push model
Questions • RethinkDB website: http://rethinkdb.com • Install RethinkDB: http://rethinkdb.com/install/ •
Email me:
[email protected]
• Tweet: @thejsj, @rethinkdb