How I can carry through update and delete without searching to carry through one select and later the action (update/delete)? Select generated is very expensive, therefore some entities have high degree of relationship.

Hibernate can delete an object based on a non-initialized proxy representation of the object to be deleted (i.e., session.load() on a proxiable entity). In Hibernate2, the entity needs to be selected in order to do an update.

In Hibernate3, you can use the bulk DML-like HQL statements.