Introduction to RethinkDB: 1KE Meetup

Transcript

1. 1KE Tech Talks
   San Francisco, California
   June 12, 2015
   RethinkDB
   The database for the
   realtime web
   

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2. Jorge Silva
   @thejsj
   Developer Evangelist @ RethinkDB
   

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3. Preface
   Why is realtime important?
   

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4. Realtime apps
   

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5. Realtime apps
   

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6. Realtime apps
   • More and more apps are built to
   be realtime
   • Users have come to want and
   expect this behavior in their apps
   

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7. 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
   

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8. 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.
   

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9. Introduction
   What is RethinkDB?
   

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10. 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
    

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11. Built for Realtime Apps
    • Subscribe to change notifications
    from database queries
    • No more polling — the database
    pushes changes to your app
    • Reduce the amount of plumbing
    needed to stream live updates
    

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12. Built for Realtime Apps
    RethinkDB is an excellent database for:
    • Collaborative web and mobile apps
    • Multiplayer games
    • Streaming analytics apps
    • Realtime marketplaces
    • Connected devices
    

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13. Introduction to ReQL
    RethinkDB Query Language
    

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14. Introduction to ReQL
    • ReQL embeds natively into your
    programming language
    • Compose ReQL queries by
    chaining commands
    

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15. Anatomy of a ReQL Query
    r.table("players")
    .orderBy({
    index: r.desc("score")
    })
    .limit(3)
    Top three players by score
    

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16. Anatomy of a ReQL Query
    r.table("players")
    .orderBy({
    index: r.desc("score")
    })
    .limit(3)
    Access a database table
    

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17. Anatomy of a ReQL Query
    r.table("players")
    .orderBy({
    index: r.desc("score")
    })
    .limit(3)
    Order results
    

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18. Anatomy of a ReQL Query
    r.table("players")
    .orderBy({
    index: r.desc("score")
    })
    .limit(3)
    Use index as pre-processed lookup
    

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19. Anatomy of a ReQL Query
    r.table("players")
    .orderBy({
    index: r.desc("score")
    })
    .limit(3)
    Order results in descending order
    

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20. Anatomy of a ReQL Query
    r.table("players")
    .orderBy({
    index: r.desc("score")
    })
    .limit(3)
    Only get the first three results
    

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21. Subscribe to change notifications
    on database queries
    Changefeeds
    

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22. r.table("users").changes()
    Track changes on the users table
    Changefeeds
    

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23. Changefeeds
    r.table("players")
    .orderBy({
    index: r.desc("score")
    })
    .limit(3)
    .changes()
    Get updates on top three players
    

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24. Realtime apps
    Demo
    

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25. http://questions.rethinkdb.com
    Questions
    

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26. Additional Resources
    • RethinkDB website:

    http://rethinkdb.com
    • RethinkDB installation:

    http://rethinkdb.com/docs/
    install/
    

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27. Questions
    • jorge@rethinkdb.com
    • @thejsj
    

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