+Job queue items are fetched out of the queue and run either at a random rate
+during regular page views (by default) or by a batch process which can be run
+via maintenance/runJobs.php.
+
+Currently there are a few different types of jobs:
+
+ refreshLinks
+ Used to refresh the database tables that store the links between pages.
+ When a page is changed, all pages using that page are also cleared by
+ inserting a new job for all those pages. Each job refreshes only one page.
+
+ htmlCacheUpdate
+ Clear caches when a template is changed to ensure that changes can be seen.
+ Each job clears $wgUpdateRowsPerJob pages (500 by default).
+
+ enotifNotify
+ Used when $wgEnotifUseJobQ is true to send mail using the job queue.