Dave Elkins

http://m.onkey.org/2010/1/22/active-record-query-interface
http://railstips.org/blog/archives/2010/01/22/multiple-domain-page-caching/

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http://blog.plataformatec.com.br/2009/12/subdomains-and-sessions-to-the-rescue/

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http://github.com/blog/551-optimizing-asset-bundling-and-serving-with-rails

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This is another great article from the EngineYard blog.  It talks about the common reasons for memory leaks that come from ActiveRecord.  It also provides links to several good tools for finding requests that have memory leak issues.
http://www.engineyard.com/blog/2009/thats-not-a-memory-leak-its-bloat/
Other links in article:

http://github.com/brynary/rack-bug/tree/master
http://github.com/binarylogic/memorylogic/tree/master
http://github.com/noahd1/oink/tree/master

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http://www.taylorluk.com/articles/2009/08/12/hey-pac-man-sup-subdomains

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http://37signals.com/svn/posts/1872-nuts-bolts-configuration-management-with-chef
http://github.com/37signals/37s_cookbooks/tree/master

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http://blog.new-bamboo.co.uk/2009/8/14/block-helpers

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A good article from the GitHub guys about cleaning up and speeding up their deployment with Capistrano.
http://github.com/blog/470-deployment-script-spring-cleaning

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http://awesomeful.net/posts/45-postgresql-rails-and-why-you-should-care
it gives an overview of what PostgreSQL provides, some history of the debate between MySQL and PostgreSQL and why you should consider using PostgreSQL.

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http://m.onkey.org/2009/7/29/running-rails-performance-tests-on-real-data

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