MongoDB Schema Design - MongoNY

MongoDB Schema Design MongoNYC (#mongonyc) Kyle Banker (@hwaet) May 21, 2010 10gen http://www.mongodb.org/ Tuesday, May 25, 2010

1. Schema Design Questions Tuesday, May 25, 2010

What’s the basic unit of data? Tuesday, May 25, 2010

What’s the basic unit of data? Blobs? Tuesday, May 25, 2010

What’s the basic unit of data? Blobs? Rows? Tuesday, May 25, 2010

What’s the basic unit of data? Blobs? Rows? Columns? Tuesday, May 25, 2010

What’s the basic unit of data? Blobs? Rows? Columns? Documents? Tuesday, May 25, 2010

Which operations are permitted? Tuesday, May 25, 2010

Which operations are permitted? Dynamic Queries Tuesday, May 25, 2010

Which operations are permitted? Dynamic Queries Secondary Indexes Tuesday, May 25, 2010

Which operations are permitted? Dynamic Queries Secondary Indexes Atomic Updates Tuesday, May 25, 2010

Which operations are permitted? Dynamic Queries Secondary Indexes Atomic Updates Map-‐Reduce Tuesday, May 25, 2010

What are our application access patterns? Tuesday, May 25, 2010

What are our application access patterns? Read / Write Ratio Tuesday, May 25, 2010

What are our application access patterns? Read / Write Ratio Types of updates Tuesday, May 25, 2010

What are our application access patterns? Read / Write Ratio Types of updates Range of Queries Tuesday, May 25, 2010

2. Rich Documents Tuesday, May 25, 2010

Tuesday, May 25, 2010

But what can you do with a rich document? Tuesday, May 25, 2010

Queries Tuesday, May 25, 2010

Atomic Updates Tuesday, May 25, 2010

Map-‐Reduce Tuesday, May 25, 2010

More rich-‐document goodness... Tuesday, May 25, 2010

wordnik.com Tuesday, May 25, 2010

Advantages “Pre-‐joined” for fast retrieval. Tuesday, May 25, 2010

Advantages “Pre-‐joined” for fast retrieval. Holistic representation. Tuesday, May 25, 2010

Advantages “Pre-‐joined” for fast retrieval. Holistic representation. MongoDB can act on these. Tuesday, May 25, 2010

Tradeoﬀs The Normalization / Denormalization Question Tuesday, May 25, 2010

Tradeoﬀs The Normalization / Denormalization Question Know your queries / updates in advance Tuesday, May 25, 2010

2. Simpliﬁed Relations Tuesday, May 25, 2010

Tags Tuesday, May 25, 2010

Votes Tuesday, May 25, 2010

Adding a vote Tuesday, May 25, 2010

Adding a vote Finding all votes for a given user Tuesday, May 25, 2010

4. Standard Relationships Tuesday, May 25, 2010

post -‐> many comments Relational model: post comments post_id user_id tree attrs Tuesday, May 25, 2010

1. Embedded Document Tuesday, May 25, 2010

2. Embedded and Nested Document Tuesday, May 25, 2010

3. Normalized Collection Tuesday, May 25, 2010

Use Cases 1. Embedded document Fast queries Document always appears w/ parent. Tuesday, May 25, 2010

Use Cases 1. Embedded document Fast queries Document always appears w/ parent. 2. Embedded & nested document Complex hierarchies Document appears with parent Tuesday, May 25, 2010

Use Cases 1. Embedded document Fast queries Document always appears w/ parent. 2. Embedded & nested document Complex hierarchies Document appears with parent 3. Normalized Maximum ﬂexibility. Simpliﬁed global updates. Tuesday, May 25, 2010

Tuesday, May 25, 2010

products <-‐> categories Relational model: products join product_id category_id categories Tuesday, May 25, 2010

Products and Categories Tuesday, May 25, 2010

Products and Categories (Alternative) Tuesday, May 25, 2010

5. Resources Tuesday, May 25, 2010

Trees http://www.mongodb.org/display/DOCS/Trees+in+MongoDB Tuesday, May 25, 2010

Trees http://www.mongodb.org/display/DOCS/Trees+in+MongoDB Stacks, Queues, Lists http://www.mongodb.org/display/DOCS/ﬁndandmodify+Command Tuesday, May 25, 2010

Trees http://www.mongodb.org/display/DOCS/Trees+in+MongoDB Stacks, Queues, Lists http://www.mongodb.org/display/DOCS/ﬁndandmodify+Command Contribute http://cookbook.mongodb.org Tuesday, May 25, 2010

Trees http://www.mongodb.org/display/DOCS/Trees+in+MongoDB Stacks, Queues, Lists http://www.mongodb.org/display/DOCS/ﬁndandmodify+Command Contribute http://cookbook.mongodb.org Consulting info@10gen.com Tuesday, May 25, 2010

6. Shameless Plugs Tuesday, May 25, 2010

MongoDB Training | July 7-‐8 http://ideafoundry.info/mongodb Tuesday, May 25, 2010

My next talk today..... MongoDB in Ruby’s Embrace MongoNYC (#mongonyc) Kyle Banker (@hwaet) May 21, 2010 10gen http://www.mongodb.org/ Tuesday, May 25, 2010

Thank You http://www.mongodb.org/ Tuesday, May 25, 2010

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MongoDB Schema Design - MongoNY

by Kyle Banker

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