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manual/new/docs/en/connection-management/lazy-connecting-to-database.txt

-Lazy-connecting to database is handled via Doctrine_Db wrapper. When using Doctrine_Db instead of PDO / Doctrine_Adapter, lazy-connecting to database is being performed (that means Doctrine will only connect to database when needed). 
+Lazy-connecting to database can save a lot of resources. There might be many pages where you don't need an actual database connection, hence its always recommended to use lazy-connecting (that means Doctrine will only connect to database when needed).
 
 This feature can be very useful when using for example page caching, hence not actually needing a database connection on every request. Remember connecting to database is an expensive operation.
 
 <code type="php">
-// we may use PDO / PEAR like DSN
-// here we use PEAR like DSN
-$dbh = new Doctrine_Db('mysql://username:password@localhost/test');
-// !! no actual database connection yet !!
+$dsn = 'mysql://username:password@localhost/test';
 
 // initalize a new Doctrine_Connection
-$conn = Doctrine_Manager::connection($dbh);
+$conn = Doctrine_Manager::connection($dsn);
 // !! no actual database connection yet !!
 
 // connects database and performs a query