Comments on: Multiple DB connections in Rails/ActiveRecord http://blog.vishnugopal.com/2008/01/12/multiple-db-connections-in-railsactiverecord/ blog.vishnugopal.com Mon, 25 Jan 2010 17:32:13 +0000 http://wordpress.com/ hourly 1 By: vishnu http://blog.vishnugopal.com/2008/01/12/multiple-db-connections-in-railsactiverecord/#comment-803 vishnu Sat, 12 Jan 2008 17:22:33 +0000 http://vysnu.com/log/2008/01/12/multiple-db-connections-in-railsactiverecord.html#comment-803 ActiveRecord/Ruby afaik by default maintains (persists) a single connection for a thread and across all statements executed by that thread (at least for the MySQL driver). Multiple threads have their own connections. You have to go through a non-trivial process to make multiple threads share a connection but this is often a non-issue since Ruby/Rails doesn't have that many threads for any deployment. ActiveRecord/Ruby afaik by default maintains (persists) a single connection for a thread and across all statements executed by that thread (at least for the MySQL driver).

Multiple threads have their own connections. You have to go through a non-trivial process to make multiple threads share a connection but this is often a non-issue since Ruby/Rails doesn’t have that many threads for any deployment.

]]> By: The Overclocked Fragger http://blog.vishnugopal.com/2008/01/12/multiple-db-connections-in-railsactiverecord/#comment-802 The Overclocked Fragger Sat, 12 Jan 2008 12:16:32 +0000 http://vysnu.com/log/2008/01/12/multiple-db-connections-in-railsactiverecord.html#comment-802 Finally, a code snippet on your site which I can understand atleast partially! :D AR sounds very similar to ADO's recordsets. Got some doubts here. Lets take the case where we are connecting to an Oracle database, which doesn't like multiple connections, due to max load reasons. Does AR connect and disconnect for every .execute instance? Or is it possible to maintain a single connection throughout the time during which we use the client app? Thats a standard we follow while doing ADO in VB/.Net. Finally, a code snippet on your site which I can understand atleast partially! :D

AR sounds very similar to ADO’s recordsets.

Got some doubts here.

Lets take the case where we are connecting to an Oracle database, which doesn’t like multiple connections, due to max load reasons.

Does AR connect and disconnect for every .execute instance?

Or is it possible to maintain a single connection throughout the time during which we use the client app? Thats a standard we follow while doing ADO in VB/.Net.

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