MongoDB is the New MySQL

Friday, July 23, 2010

MongoDB is...

• a schema-less, document-oriented database

• open-source (server: GPL, drivers: Apache)

• built on C++

• supported commercially by 10gen

Friday, July 23, 2010

Why MongoDB?

• Fast

• Highly scalable: replication, sharding

• Open-source• runs on Windows

Friday, July 23, 2010

Trade-offs

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ACID

• Atomicity - A transaction is all or nothing

• Consistency - Only valid data is written to the database

• Isolation - Pretend all transactions are happening serially and the data is correct

• Durability - What you write is what you get

Friday, July 23, 2010

BASE

• Basically Available - system seems to work all the time

• Soft state - it doesn’t have to be consistent all the time

• Eventually consistent - becomes consistent at some later time

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Scal

abili

ty &

Per

form

ance

Depth of Functionality

memcached

key-value stores mongoDB

RDBMS

Friday, July 23, 2010

Programming

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ActiveModel?

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Persistence

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Querying

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Named Scopes!

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Named Scopes!

Friday, July 23, 2010

Named Scopes!

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Callbacksbefore_createbefore_destroybefore_savebefore_updatebefore_validationafter_createafter_destroyafter_saveafter_updateafter_validation

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Validation

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Administration

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Replication

• M -> S

• M -> S*

• Replica sets [aka clusters] coming in v.1.6

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Sharding

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Questions?Radamanthus Batnag

rad@infinite.ly

Friday, July 23, 2010

Links

• http://www.mongodb.org/

• http://www.mongoid.org

• http://highscalability.com/drop-acid-and-think-about-data

• http://www.thenetworkadministrator.com/MongoDB_MySQL.htm

Friday, July 23, 2010