Manual:Page moving
Moving a page causes the page title to change while the page ID remains the same, and the revision history is retained.
If a redirect is created under the moved page's former page title, it will have a new page ID.
Pages can be moved using Special:MovePage (SpecialMovepage.php) or action=move (ApiMove.php).
Moving a page, and then moving ID again, can create double redirects.
Database
There are two possible kinds of page move log actions: move and move_redir.
The latter refers to a move over a redirect.
API
A page move log event has a "move" sub-element, e.g. <move new_ns="0" new_title="Foo" suppressredirect="" />
Hooks
Hooks that pertain to page moves are: