MongoDB for the .NET Developer

MongoDB for the .NET Developer Lynn Langit Data Wrangler May 2012 – For NoSQL class

What We’ll Cover• What• Why• When and Where• How• How much

Section OneMONGODB BASICS

What is MongoDB?

What is MongoDB?• Open source NoSQL database• Document-oriented• Stores JSON-like documents (dynamic schemas)• Includes a strong query language (javascript)• Powerful, flexible indexing (including geospatial)• Sharding and replication• Cross-Platform (many drivers )

ActivityONLINE TUTORIAL - TRY IT OUT

Why use MongoDB?• When your source data is ‘document-like’ – i.e. Document Management systems – E-commerce (catalog portion only) – When your source data doesn’t require joins• Archiving / event logging – Real time analytics (based on logging)• Gaming – Geospatial – Mobile

So which type of NoSQL? Back to CAP… CA = SQL/RDBMSCP = noSQL/column SQL Sever / SQLHadoop AzureBig Table OracleH-base MySQLMemCacheDB(graph)? Consistency Availability AP = noSQL/document or key/value MongoDB Partitioning DynamoDB CouchDB Cassandra Voldemort

Relational & Document Models• Both systems support… – primary keys and indexes – queries with models for sorting / limiting results – a strong typing system – aggregations like SUM(), COUNT(), etc…

Document Model Databases have…• No Tables• No T-SQL• No Joins• No pre-defined Schema• Aggregations via Grouping or MapReduce• No Transactions• No Full-text search

Unique to MongoDB• BSON supports more complex types (date, geo-spatial, etc…)• Supports dynamic queries via proprietary query language – Uses “find()” which returns a *lazy+ cursor – Ex., “Db.posts.find().sort(,date:-1}).limit(10);” – Multi-key indexes can be created

Use 10gen Quick Reference Cards

Get MongoDB and Driver(s)• Quick download, zero install• Also get your driver (C# for us)

ActivitySETUP MONGODB

Starting up MongoDB

Using the console

Using MongoVue

Connecting with MongoVue

Using MongoVue

Adding Data• Data must be in JSON format - converter• “Insert” CREATES a collection if needed

Importing data…using MongoVue

ActivityADDING DATA TO MONGODB

Viewing Collection Data

Using FindFind, Fields, Sort, Count, Skip, Limit, Visualize or Export

Data Visualization

Understanding Explain• Query execution detail plan• Review number of scanned objects

Modifying Data• Update – alone does a replace• Update w/ $set – does an update• Update w/ $inc – increments• Upserts – must be enabled, then insert if new, update if existing• Multiple field updates occur by default

Using Update

Section TwoMONGODB PROGRAMMING

Comparing…

ActivityQUERY MONGODB DATA

Queries

Queries more

Queries 3…

What is Grouping?• Similar to T-SQL ‘Group By’• Written in javascript

MapReduce in MongoDB• Written in JavaScript• Map – Transforms input and emits key => value pairs – These K/V pairs will be reduced• Reduce – Transform key/values to output via aggregation• Finalize (optional)• Filters (optional)

Using MapReduce• Example: find the 2 closest cities in each country, except in United States• Using SQL Server (T-SQL) vs.• Using MongoDB (MapReduce)

MapReduce in MongoVue - I

MapReduce in MongoVue - II

ActivityMAPREDUCE IN MONGODB

What about Joins?• No traditional joins in MongoDB• Can use Arrays• Can use Embedded Documents• Can use DBRef• Can De-normalize schema

Modeling• Use short names – each name is saved for each document, can save up to 30% storage• Keep collections small• Document size maximum is 4 MB• Use GridFS for BLOBs

How to Model• Using Velocity

Query Tuning• Use best indexes – Non _id – Add columns to index (specificity) – Mulitple columns, most specific first – Test to make sure indexes are being used• Qty scanned s/b same as QTY returned• Use .explain

ActivityADD INDEXES TO MONGODB

What is GridFS?• Used to hold objects larger than 4 MB

ActivityUSING GRIDFS

Programming against MongoDB

ActivityCONNECTING TO MONGODB WITHC#

More Information• MongoDB – http://www.mongodb.org• 10gen – http://www.10gen.com/contact – info@10gen.com• YouTube videos (from Lynn Langit) – MongoDB Playlist - https://www.youtube.com/playlist?list=PLCE5902FB1D284880 &feature=view_all• MongoDB LA UG - http://www.meetup.com/Los-Angeles- MongoDB-User-Group

The Changing Data Landscape Other ServicesRDBMS NoSQL

• recipes)www.TeachingKidsProgramming.org• Free Courseware (• Do a Recipe  Teach a Kid (Ages 10 ++)• Java or Microsoft SmallBasic 

Toward Data Craftsmanship… Follow me @LynnLangit RSS my blog www.LynnLangit.com Hire me • To help build your BI/Big Data solution • To teach your team next gen BI • To learn more about using NoSQL solutions

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MongoDB for the .NET Developer

by Lynn Langit

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MongoDB for the .NET Developer Presentation Transcript