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POMySQL partitioning with ActiveRecord
 

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    <p>I want to take advantage of the new partitioning in MySQL 5.1 but using a standard ActiveRecord model. The problem I have encountered is that to use the partitioning the primary key on the table must include the columns used in the partitioning function. (<a href="http://dev.mysql.com/doc/refman/5.1/en/partitioning-limitations-partitioning-keys-unique-keys.html" rel="nofollow noreferrer">http://dev.mysql.com/doc/refman/5.1/en/partitioning-limitations-partitioning-keys-unique-keys.html</a>)</p> <p>Now, I want to have a auto-incrementing 'id' field (which is usually used as the primary key in Rails) but I want to partition using another column, in this case 'task_id'. Crucially I don't want to use composite primary keys in my Rails application. My question is this:</p> <p>If I set up the table as follows:</p> <pre><code>"CREATE TABLE `annotations` ( `id` int(11) NOT NULL AUTO_INCREMENT, `task_id` int(11) DEFAULT NULL, `user_id` int(11) DEFAULT NULL, `value` text, `created_at` datetime DEFAULT NULL, `updated_at` datetime DEFAULT NULL, PRIMARY KEY (`id`, `task_id`), KEY `index_annotations_on_task_id` (`task_id`), KEY `index_annotations_on_user_id` (`user_id`) ) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8 PARTITION BY RANGE(task_id)( PARTITION 1_to_5 VALUES LESS THAN (6), PARTITION 6_to_10 VALUES LESS THAN (11), PARTITION 11_to_15 VALUES LESS THAN (16))" </code></pre> <p>where I have the primary key composed of the 'id' and 'task_id' columns, and I don't do anything special with the ActiveRecord model, am I setting myself up for any headaches in the future? </p> <p>Basically, I'm creating a table with a primary key based upon two columns but not telling ActiveRecord about the second column as I still have an auto-incrementing id field - can anyone see any problems with this approach? </p>
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