Introducing RavenDB - Agile Persistence in .Net (@dnugbe)

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Introducing RavenDB Agile Persistence in .Net

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About Johnny Graber •Software Engineer - Swiss Medical Association •Twitter: @j_graber •E-Mail: [email protected] •Blog: ImproveAndRepeat.com Examples at

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Today’s Main Topics •NoSQL •RavenDB •Agile Persistence

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Demo RavenDB .Net Client How simple is it to access RavenDB?

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NoSQL?

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No SQL

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Not only SQL

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Polyglot Persistence

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Relational Databases aren’t Obsolete

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Great for •Optimized Writes •Minimal Storage Footprint •Flexible Querying

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But •Mostly Reads in Our Applications •Storage Costs (Almost) Nothing •Hard to Scale

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NoSQL Provides Solutions

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Main Types of NoSQL •Key / Value Store •Graph Database •Column Database •Document Store

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RavenDB •2nd Generation Document Database •Built on .Net •Schema Free

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Some RavenDB Features •Safe by Default •Supports Transactions (ACID) •Best Practices Built in

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A Document in RavenDB •Self-Contained •Independent •Redundant Data (History)

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A Document in RavenDB

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Running RavenDB •Standalone Server •Part of Your Web-Application •Embedded Mode

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Installing RavenDB

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RavenDB Studio •Look Into the Database •Generate Sample Data •Administration Tools

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Demo RavenDB Studio How does the administration interface works?

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Connect to RavenDB •.Net Client Install-Package RavenDB.Client •HTTP API

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Demo HTTP API Can you use RavenDB without .Net?

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Querying RavenDB var books = from books in session.Query() where books.Title.StartsWith("Raven") select books; var book = session.Load("books/1");

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Indexes in RavenDB •All Queries Need an Index •Static or Dynamic •Created in Background (Stale Index)

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Challenges for Index Creation •Schema Free Data •Fixed Structure to Find Data •Closing the Gap with Map/Reduce

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Map/Reduce This is probably the 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

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Demo Index Creation How hard can it be?

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Licencing RavenDB •AGPL for Open Source Projects •Commercial Licence: 399$/Year/Instance •RavenHQ: Starting at 10$/Month

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Agile Persistence

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Development Today •Agile Approach •Embrace Change •Fail Fast

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Except in the Persistence Layer •First Time Right •Hard to Change •Don’t Touch

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“When the Database must be correct the first time, every part of the application must be known at the beginning”

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“Persistence should be an application detail”

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Domain-Driven Design •Aggregates •Bounded Context •Entity or Value Object

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Benefits of Following DDD Principles •History of Documents •Complete Change Tracking •Optimised Data Access

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Command Query Responsibility Segregation (CQRS) •Commands Modify State •Queries Answer Questions •Keep Them Apart

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CQRS for Fast Applications

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CQRS and RavenDB •HTTP API (REST ) •When Unauthenticated Only Allow Read •Done

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TDD and RavenDB •Don’t Abstract an Abstraction Layer! •Use In-Memory Mode •It’s Fast Enough

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Changing Documents •Easily Done •Know the Impacts •Worst Case: Full DB Update

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Demo Schema Change How can you change your schema?

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Use RavenDB •Hacking •Pet Projects •Prototypes

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Try This at Home NOT in Production!

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What’s Missing •Authorisation & Authentication •Bulk Inserts •Paging •Sharding

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More on RavenDB •RavenDB.net •Tekpub.com •ImproveAndRepeat.com

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More on Polyglot Persistence •Martin Fowler: http://martinfowler.com/bliki/CQRS.html •Jimmy Bogard: Real World Polyglot Persistence http://vimeo.com/68320412