Custom your own category :

  • 1. Choose the categories by select the check box before category names.
  • 2. Choose the methode to combain the choosen categories between 'Slice' or 'Union' in the drop down list.
  • 3. Execute with click the 'Go' button.

Rails and Scaling with Multiple Databases

Custom Programming, Database, Framework, Ruby on Rails

Joe points out the following from this interview with Twitter’s Alex Payne:

The problem is that more instances of Rails (running as part of a Mongrel cluster, in our case) means more requests to your database. At this point in time there’s no facility in Rails to talk to more than one database at a time.

..

In my case, ActiveRecord provided exactly the right level of functionality. I can have multiple database connections established and write code to manage when each should be used. Control of which connection is used is managed at the model level. Connections cascade up inheritance chains and I can specify that one model use the connection specified on another model using a simple delegate statement:

class A < ActiveRecord::Base
end

class B < ActiveRecord::Base
   class << self
     delegate :connection, :to => A
   end
end

…

Full article: http://tomayko.com/writings/rails-multiple-connections

License: Creative Commons

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Indexed in May 2008

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