Active Record Sharding

Distribute read and write queries to your database across several database servers to help with scaling

There's a lot of open issues
A long-lived project that still receives updates
This gem allows you to use sharded databases with ActiveRecord. This also provides a interface for replication and for running migrations with multiples shards.
Repository is archived
No release in over 3 years
Low commit activity in last 3 years
DbCharmer is a Rails plugin (and gem) that could be used to manage AR model connections, implement master/slave query schemes, sharding and other magic features many high-scale applications need.
No commit activity in last 3 years
ActiveRecord connection proxy for master/slave connections
No commit activity in last 3 years
Horizontal scaling for your Rails or Merb app. Built on ActiveRecord.