2011 08-16 MongoNYC

Happiness isMongoDB
Tuesday, august16th, 2011
Daniel Doubrovkine (dB.) | @dblockdotorg | http://art.sy

Art Genome Project
Kasimir Malevich – “Self Portrait” - vs. - William Beckman – “Self Portrait”

Nearest Neighbor Search in High-Dimensional Space
Euclidean Distance
artworks.each { |a2|
d = euclidean(a1, a2)
}.sort by |d|
𝑑=(100−40)2+(0−100)2+…+(0−60)2

MySQL Prototype: Schema

MySQL Prototype: Schema
Need a sorted vector of values, including zeroes: [ 100, 0, 20, … 60 ] on boot
Annoying …
10K artworks: 5 minutes to startup
… accomplishes nothing.

MongoDB
Genome.genes – it’s a hash!
{ “Career Stage” => 100, …, “Conceptual” => 20 }
Genome, Embedded in Artwork
Locality Sensitive Hashing

Choosing MongoDB
Got (too) many years of experience with *SQL / DW
@harryh uses it @ 4sq
@eliothorowitzlooks pretty smart
db.startups.find({ location : { $near : GA }, category : ‘nosql database vendor' } ).first = 10gen
install … ? … profit
available on Heroku from MongoHQ
much better for continuous deployment

Tidbits
MongoDB retrieval by ID is as fast, if not faster, than Ruby Hash
Using Rails + Rake and Mongo is safer than mongo shell db.collection.update({x: y})
Shared Hosting is not Rubber, You Can’t Stretch It
Map/reduce for live queries really doesn’t work, no reallymongoid_fulltext
Read-secondary + Map/Reduce can be fun read_secondary: <%= $rails_rake_task.nil? or !$rails_rake_task %>
Collection names are limited in length if you use mongodumphttps://jira.mongodb.org/browse/SERVER-2973
copyDatabase requires administrative privilegeshttps://jira.mongodb.org/browse/SERVER-2846
Mongo cursors aren’t snapshotted by defaultProcessing 5183 of 4012 …http://www.mongodb.org/display/DOCS/How+to+do+Snapshotted+Queries+in+the+Mongo+Database
Mongo Interest is growing, RoR + MongoId = GTDhttp://code.dblock.org/ror-win-getting-things-done-with-mongodb-mongoid

Dev/Staging/Production
MongoHQ Extensions via Heroku
Production Directly w/MongoHQ
A Few Hundred Bucks / mo.
Mongo 1.8.1 w/ replica sets, 2 DBs and 1 arbiter
Different Availability Zones
Dedicated RAM, separate EBS, shared CPU
Early Issues, Now Very Stable
Jason McCay + other folks @ MongoHQ= Awesome
Mongoid2.0.2
mongoid_slug
mongoid_fulltext
mongoid_history
delayed_job_mongoid

We *heart* MongoDB
name: Daniel Doubrovkine(aka. dB.)
company: http://art.sy
^work here twitter:@dblockdotorg
blog: http://code.dblock.org ^link to slides here
email: dblock@dblock.org

http://www.10gen.com	156
http://lanyrd.com	18
http://drupal1.10gen.cc	2
http://twitter.com	1
http://trunk.ly	1

2011 08-16 MongoNYC

by Daniel Doubrovkine

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