Updated Hitchhiker's Rough Guide to Org roam V2 (org)

Hitchhiker's-Rough-Guide-to-Org-roam-V2.org

@@ -388,4 +388,34 @@ For example, to use dashes rather than underscores in your slugs:
 
 You should place this in your =init.el= somewhere that is evaluated after org-roam has been loaded.
 
-For more discussion, see [[https://github.com/org-roam/org-roam/pull/1544][#1544]].
+For more discussion, see [[https://github.com/org-roam/org-roam/pull/1544][#1544]].\
+
+** Run =org-roam-db-sync= when Emacs is idle
+
+Refer to [#1939](https://github.com/org-roam/org-roam/issues/1939).
+
+You can turn off automatic db update when you save a buffer by turning off =org-roam-db-update-on-save=; e.g. when you have a large Org file and do not want the delay on save.
+
+In this case, you may like to set an idle-timer to automatically run =org-roam-db-sync= to update the db when Emacs is idle. 
+You can create your own global minor mode and toggle it on/off as you like (so that you can remove the timer).
+
+Adjust the interval to your liking.
+
+If you are Windows, you will see Error running timer ‘org-roam-db-sync’: (error "Selecting deleted buffer") every second time. That has been the way it is for Windows but works for every odd number of times.
+
+#+begin_src emacs-lisp
+(defvar my/auto-org-roam-db-sync--timer nil)
+(defvar my/auto-org-roam-db-sync--timer-interval 5)
+
+(define-minor-mode my/auto-org-roam-db-sync-mode
+  "Toggle automatic `org-roam-db-sync' when Emacs is idle.
+Referece: `auto-save-visited-mode'"
+  :group 'org-roam
+  :global t
+  (when my/auto-org-roam-db-sync--timer (cancel-timer my/auto-org-roam-db-sync--timer))
+  (setq my/auto-org-roam-db-sync--timer
+        (when my/auto-org-roam-db-sync-mode
+          (run-with-idle-timer
+           my/auto-org-roam-db-sync--timer-interval :repeat
+           #'org-roam-db-sync))))
+#+end_src