From semantic-mediawiki.org

Configuration parameter details:
Name $smwgOnDeleteAction
Description Moves the update process for when a page / property and its value assignments are deleted to the job queue.
Default setting See below
Software Semantic MediaWiki
Since version
Until version
Configuration Installation
Keyword performance · job queue

$smwgOnDeleteAction is a configuration parameter that is used to move the update process for when a page / property and its value assignments are deleted to the job queue and thus to improve it. The configuration parameter was introduced in Semantic MediaWiki on an unknown date and compatible with MW 1.19.0 - 1.22.x.. It was removed in Semantic MediaWiki 2.4.0Released on 9 July 2016 and compatible with MW 1.19.0 - 1.27.x. in favor of configuration parameter $smwgEnabledDeferredUpdateSets that updates to pages are queued and executed after edits.1

Default setting[edit]

$smwgOnDeleteAction = array(
	'smwgDeleteSubjectAsDeferredJob' => false,
	'smwgDeleteSubjectWithAssociatesRefresh' => false

The default setting represents the legacy behaviour of Semantic MediaWiki 1.8.0Released on 2 December 2012 and compatible with MW 1.17.0 - 1.22.x
(except 1.22.1).
and lower where a subject is directly deleted when "action=delete" is executed.

Available options[edit]

  • smwgDeleteSubjectAsDeferredJob - Defers the deletion process to a background job.
  • smwgDeleteSubjectWithAssociatesRefresh - Allows to refresh entities that are connected to a deleted subject.

Changing the default setting[edit]

To modify the setting to this configuration parameter, add one of the following lines to your "LocalSettings.php" file after the enableSemantics() call:

$smwgOnDeleteAction = array(
	'smwgDeleteSubjectAsDeferredJob' => true,
	'smwgDeleteSubjectWithAssociatesRefresh' => true
Due to performance implications it is advisable that in case smwgDeleteSubjectWithAssociatesRefresh is enabled the deletion process is being handled as a deferred background job with smwgDeleteSubjectAsDeferredJob enabled, too.


  • If configuration parameter $smwgEnableUpdateJobsDefers some tasks until after a page was edited by using the job queue. is disabled (not default) then the deletion process will always run directly even though smwgDeleteSubjectAsDeferredJob (see above) is enabled.
  • In case the deletion is executed as deferred job it is further suggested that the job queue is being run repeatedly within a narrow time frame to avoid an increased backlog.

See also[edit]

  • Task T61204 about the rationale for this configuration parameter


  1. ^  Semantic MediaWiki: GitHub pull request gh:smw:1435