Intro to Datomic datomic.com @stuartsierra thinkrelevance.com - - PowerPoint PPT Presentation

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Intro to Datomic datomic.com @stuartsierra thinkrelevance.com - - PowerPoint PPT Presentation

Jan 10, 2024 364 likes •732 views

Intro to Datomic datomic.com @stuartsierra thinkrelevance.com What is Datomic? What is Datomic? A new database Distributed reads ACID transactions What is Datomic? Non-relational data model Incorporates time Declarative

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Intro to Datomic

datomic.com @stuartsierra thinkrelevance.com

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What is Datomic?

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What is Datomic?

  • A new database
  • Distributed reads
  • ACID transactions
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What is Datomic?

  • Non-relational data model
  • Incorporates time
  • Declarative query language
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Where can I use it?

  • Runs on the JVM
  • Peer library:

Java and Clojure

  • ReST
  • ful API for

non-JVM languages

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Datomic Free Edition

  • Always free, redistributable
  • 1 transactor, up to 2 peers
  • Local memory or filesystem storage
  • Easy migration to Datomic Pro
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Datomic Pro Edition

  • License by number of peers
  • High-availability transactor
  • Multiple distributed storage services
  • Integrated memcached
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Data Model

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Fact

  • One piece of information
  • About one thing
  • At a specific point in time
  • An immutable value
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Database

  • A collection of facts
  • At a specific point in time
  • An immutable value
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Entity

  • A collection of facts about one thing
  • Can be viewed as a map
  • Traversable as a graph
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Fact = Datom

Entity Attribute Value Time

21005 :name "Stuart" 400 21005 :nerd-level 6.8 400 21005 :name "Frodo" 421 21005 :nerd-level 9.6 421

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Database as of now

Entity Attribute Value Time

21005 :name "Stuart" 400 21005 :nerd-level 6.8 400 21005 :name "Frodo" 421 21005 :nerd-level 9.6 421

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Database as of t=400

Entity Attribute Value Time

21005 :name "Stuart" 400 21005 :nerd-level 6.8 400 21005 :name "Frodo" 421 21005 :nerd-level 9.6 421

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Database as History

Entity Attribute Value Time

21005 :name "Stuart" 400 21005 :nerd-level 6.8 400 21005 :name "Frodo" 421 21005 :nerd-level 9.6 421

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Datomic Architecture

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Peer Library Storage Service Transactor

Datomic Components

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Your Application

Peer Library Storage Service Transactor

Peer Library

  • Included in your app
  • Executes queries locally
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Your Application

Peer Library Storage Service Transactor

Peer Library

  • Reads data from storage
  • Caches locally

cache

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Your Application

Peer Library Storage Service Transactor

Scale Horizontally

cache

Your Application

Peer Library

Your Application

Peer Library

cache cache

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Your Application

Peer Library Storage Service Transactor

Transactor

  • Standalone system
  • Scales vertically
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Your Application

Peer Library Storage Service Transactor

Transactor

  • Standalone system
  • Hot standby for failover
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Your Application

Peer Library Storage Service Transactor

Transactor

  • Coordinates writes
  • Guarantees ACID transactions
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Your Application

Peer Library Storage Service Transactor

Transactor

  • Writes transaction log to storage
  • Generates indexes
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Storage Service Transactor

Transactor

  • Broadcasts live updates

Your Application

Peer Library

cache

Your Application

Peer Library

Your Application

Peer Library

cache cache

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Your Application

Peer Library Storage Service Transactor

Storage

  • Provided as a service
  • Many different back-ends
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Your Application

Peer Library Storage Service Transactor

Local Storage

  • Memory
  • Filesystem
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PostgreSQL Your Application

Peer Library Storage Service Transactor

Nearby Storage

  • SQL database
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Your Application

Peer Library Storage Service Transactor

Distributed Storage

  • DynamoDB
  • Infinispan
  • Riak
  • Couchbase
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Your Application

Peer Library Storage Service

Your Application

Peer Library

Your Application

Peer Library

Datomic Components

Transactor

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Your Application

Peer Library Storage Service

Transactions Your Application

Peer Library

Your Application

Peer Library

ACID Writes

Transactor

Transactions & Indexes

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Your Application

Peer Library Storage Service

Live updates Your Application

Peer Library

Your Application

Peer Library

Live Updates

Transactor

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Your Application

Peer Library Storage Service

Your Application

Peer Library

Your Application

Peer Library

Distributed Reads

Transactor

Reads

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Your Application

Peer Library Storage Service

Your Application

Peer Library

Your Application

Peer Library

Local Caches

cache cache cache

Transactor

Reads

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Your Application

Peer Library Storage Service

Your Application

Peer Library

Your Application

Peer Library

Shared Memcached

Transactor

Reads

Memcached

cache cache cache

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Datomic.com

  • @datomic_team
  • Google Group “Datomic”
  • @stuartsierra
  • thinkrelevance.com
  • clojure.com