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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
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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
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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!
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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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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
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