./Mpd/Protocol/index.html#type-response">Mpd.Protocol.response</a> Lwt.t</code></dt><dd><p>Update the music database: find new files, remove deleted files, update modified files. URI is a particular directory or song/file to update. If you do not specify it, everything is updated. Prints &quot;updating_db: JOBID&quot; where JOBID is a positive number identifying the update job. You can read the current job id in the status response.</p></dd></dl><dl><dt class="spec value" id="val-rescan"><a href="#val-resca