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Einführung in RavenDB
The document introduces RavenDB, a second-generation document database built on .NET that supports agile persistence and NoSQL principles. It highlights key features such as ACID transactions, flexible querying through indexes, and the benefits of domain-driven design (DDD) principles. The presentation covers installation, querying, and challenges in schema-free data usage, as well as the licensing options for RavenDB.
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Einführung in RavenDB
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- 2. About Johnny Graber •SoftwareEngineer - Swiss Medical Association •Twitter: @j_graber •E-Mail: JG@JGraber.ch •Blog: ImproveAndRepeat.com Examples at
- 4. Today’s Main Topics •NoSQL •RavenDB •AgilePersistence
- 5. Demo RavenDB .NetClient How simple is it to access RavenDB?
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- 11. Great for •Optimized Writes •MinimalStorage Footprint •Flexible Querying
- 12. But •Mostly Reads inOur Applications •Storage Costs (Almost) Nothing •Hard to Scale
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- 14. Main Types ofNoSQL •Key / Value Store •Graph Database •Column Database •Document Store
- 16. RavenDB •2nd Generation DocumentDatabase •Built on .Net •Schema Free
- 17. Some RavenDB Features •Safeby Default •Supports Transactions (ACID) •Best Practices Built in
- 18. A Document inRavenDB •Self-Contained •Independent •Redundant Data (History)
- 19. A Document inRavenDB
- 20. Running RavenDB •Standalone Server •Partof Your Web-Application •Embedded Mode
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- 22. RavenDB Studio •Look Intothe Database •Generate Sample Data •Administration Tools
- 23. Demo RavenDB Studio Howdoes the administration interface works?
- 24. Connect to RavenDB •.NetClient Install-Package RavenDB.Client •HTTP API
- 25. Demo HTTP API Canyou use RavenDB without .Net?
- 26. Querying RavenDB var books= from books in session.Query<Book>() where books.Title.StartsWith("Raven") select books; var book = session.Load<Book>("books/1");
- 27. Indexes in RavenDB •AllQueries Need an Index •Static or Dynamic •Created in Background (Stale Index)
- 28. Challenges for IndexCreation •Schema Free Data •Fixed Structure to Find Data •Closing the Gap with Map/Reduce
- 29. Map/Reduce This is probablythe most common error that people make with any sort of data access technology. "Just give me the whole thing, I'll make sense of it on the client side." In the RDBMS world, this would be expressed as "SELECT * FROM Orders". The problem with such queries is they can potentially… Map Reduce
- 30. Demo Index Creation Howhard can it be?
- 31. Licencing RavenDB •AGPL forOpen Source Projects •Commercial Licence: 399$/Year/Instance •RavenHQ: Starting at 10$/Month
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- 33. Development Today •Agile Approach •EmbraceChange •Fail Fast
- 34. Except in thePersistence Layer •First Time Right •Hard to Change •Don’t Touch
- 35. “When the Databasemust be correct the first time, every part of the application must be known at the beginning”
- 36. “Persistence should be anapplication detail”
- 37. Domain-Driven Design •Aggregates •Bounded Context •Entityor Value Object
- 38. Benefits of FollowingDDD Principles •History of Documents •Complete Change Tracking •Optimised Data Access
- 39. Command Query Responsibility Segregation(CQRS) •Commands Modify State •Queries Answer Questions •Keep Them Apart
- 40. CQRS for FastApplications
- 41. CQRS and RavenDB •HTTPAPI (REST ) •When Unauthenticated Only Allow Read •Done
- 42. TDD and RavenDB •Don’tAbstract an Abstraction Layer! •Use In-Memory Mode •It’s Fast Enough
- 43. Changing Documents •Easily Done •Knowthe Impacts •Worst Case: Full DB Update
- 44. Demo Schema Change Howcan you change your schema?
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- 46. Try This atHome NOT in Production!
- 47. What’s Missing •Authorisation &Authentication •Bulk Inserts •Paging •Sharding
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- 49. More on PolyglotPersistence •Martin Fowler: http://martinfowler.com/bliki/CQRS.html •Jimmy Bogard: Real World Polyglot Persistence http://vimeo.com/68320412
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Editor's Notes
- #4 Nächste Woche an der SoftShake in Genf, 300 Besucher, Hat noch Tickets Testen der Folien und Beispiele, Feedback sehr willkommen!
- #5 RavenDB ist ein tolles Produkt. Ohne Wissen über die Problemfelder die zur Entstehung führten kann man nur schwer die Vorteile erkennen. Da ich keine Lizenzen verkaufe möchte ich im 3. Teil vor allem über die dadurch gewonnenen Möglichkeiten sprechen.
- #6 Da jeder immer nur von einfach spricht schauen wir einmal an wie einfach es wirklich ist
- #10 Heute Benutzt: Amazon (Relational Produktekatalog, GraphDB für Empfehlungen, usw). Ihr selber: Caching, Sessions, Cookies,
- #26 Get Resource/Id (Created in .Net) Put Resource/Id + JSON Show in RavenDB Studio
- #31 Create AllProducts Index Destination Query in HTTP Query in .Net
- #45 .Net Class Add Field Add Code to Set Field Add New, Update Old DNUG: Speichern ohne Authoren zu speichern, einmal mit, einmal als Wrapper (Ids übernehmen!)