$smwgQueryResultCacheLifetime

Configuration parameter details:
Name	$smwgQueryResultCacheLifetime
Description	Sets the cache lifetime of embedded queries and their results fetched from the query engine
Default setting	60 * 60 * 24 * 7
Software	Semantic MediaWiki
Since version	2.5.0
Until version	still available
Configuration	Cache · Experimental
Keyword	caching · object cache · performance · query performance · query result cache · experimental

$smwgQueryResultCacheLifetime is a configuration parameter that sets the cache lifetime of embedded queries and their results fetched from the query engine. It was introduced in Semantic MediaWiki 2.5.0Released on 14 March 2017 and compatible with MW 1.23.0 - 1.29.x..1

This configuration parameter only takes effect if the query results cache was enabled.

Default setting

$smwgQueryResultCacheLifetime = 60 * 60 * 24 * 7;

This means that by default lifetime of the query result cache is one week.

Changing the default setting

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

Disable forced query result updates

$smwgQueryResultCacheLifetime = 0;

This means that a query result is kept until it is being evicted2 by another trigger. See the help page on query result caching for further information.

Shorten the cache lifetime to a day

$smwgQueryResultCacheLifetime = 60 * 60 * 24;

This means that a query result is kept for a day until it is being evicted2.

Extend the cache lifetime to a month

$smwgQueryResultCacheLifetime = 60 * 60 * 24 * 30;

This means that a query result is kept for a month until it is being evicted2.

See also

Query result caching

• Help page on the query result cache
• Help page on configuration parameter $smwgQueryResultCacheTypeSets whether the query result cache may be used
• Help page on configuration parameter $smwgQueryResultNonEmbeddedCacheLifetimeSets the cache lifetime of non-embedded queries and their results fetched from the query engine
• Help page on configuration parameter $smwgQueryResultCacheRefreshOnPurgeSets whether it is possible to manually refresh the query cache by doing a "purge" action

Embedded query updates

• Help page on embedded query updates
• Help page on configuration parameter $smwgEnabledQueryDependencyLinksStoreSets whether tracking and storing of dependencies of embedded queries may be used