Introduction to RethinkDB: 1KE Meetup

Transcript

1. 1KE Tech Talks San Francisco, California June 12, 2015 RethinkDB The database for the realtime web
2. Jorge Silva @thejsj Developer Evangelist @ RethinkDB
3. Preface Why is realtime important?
4. Realtime apps
5. Realtime apps
6. Realtime apps • More and more apps are built to be realtime • Users have come to want and expect this behavior in their apps
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
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.
9. Introduction What is RethinkDB?
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
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
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
13. Introduction to ReQL RethinkDB Query Language
14. Introduction to ReQL • ReQL embeds natively into your programming language • Compose ReQL queries by chaining commands
15. Anatomy of a ReQL Query r.table("players") .orderBy({ index: r.desc("score") }) .limit(3) Top three players by score
16. Anatomy of a ReQL Query r.table("players") .orderBy({ index: r.desc("score") }) .limit(3) Access a database table
17. Anatomy of a ReQL Query r.table("players") .orderBy({ index: r.desc("score") }) .limit(3) Order results
18. Anatomy of a ReQL Query r.table("players") .orderBy({ index: r.desc("score") }) .limit(3) Use index as pre-processed lookup
19. Anatomy of a ReQL Query r.table("players") .orderBy({ index: r.desc("score") }) .limit(3) Order results in descending order
20. Anatomy of a ReQL Query r.table("players") .orderBy({ index: r.desc("score") }) .limit(3) Only get the first three results
21. Subscribe to change notifications on database queries Changefeeds
22. r.table("users").changes() Track changes on the users table Changefeeds
23. Changefeeds r.table("players") .orderBy({ index: r.desc("score") }) .limit(3) .changes() Get updates on top three players
24. Realtime apps Demo
25. http://questions.rethinkdb.com Questions
26. Additional Resources • RethinkDB website:
 http://rethinkdb.com • RethinkDB installation:
 http://rethinkdb.com/docs/ install/
27. Questions • jorge@rethinkdb.com • @thejsj