Databases
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    <p>Rails has <a href="http://api.rubyonrails.org/classes/ActiveRecord/ConnectionAdapters/ConnectionPool.html" rel="nofollow">connection pooling built in</a>:</p> <blockquote> <ol> <li>Simply use ActiveRecord::Base.connection as with Active Record 2.1 and earlier (pre-connection-pooling). Eventually, when you’re done with the connection(s) and wish it to be returned to the pool, you call ActiveRecord::Base.clear_active_connections!. This will be the default behavior for Active Record when used in conjunction with Action Pack’s request handling cycle.</li> <li>Manually check out a connection from the pool with ActiveRecord::Base.connection_pool.checkout. You are responsible for returning this connection to the pool when finished by calling ActiveRecord::Base.connection_pool.checkin(connection).</li> <li>Use ActiveRecord::Base.connection_pool.with_connection(&amp;block), which obtains a connection, yields it as the sole argument to the block, and returns it to the pool after the block completes.</li> </ol> </blockquote> <p>This has been available <a href="http://guides.rubyonrails.org/2_2_release_notes.html#connection-pooling" rel="nofollow">since version 2.2</a>. You'll see a <code>pool</code> parameter in your <code>database.yml</code> for controlling it:</p> <blockquote> <p><code>pool</code>: number indicating size of connection pool (default 5)</p> </blockquote> <p>I don't think there would be much point in layering another pooling system underneath it and it could even confuse AR's pooling if you tried it.</p>
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    1. POIs there any reason to use a database connection pool with ActiveRecord?
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    1. USmu is too short
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    1. COAR's connection pooling is only useful for multiple threads in the same process. An external connection pool lets you pool between multiple processes.
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    2. CO@Joe: Is that you answering your own question? That's allowed.
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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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