Manual:$wgRevisionCacheExpiry

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Content handlers and storage: $wgRevisionCacheExpiry
Cache extracted revision text in MemCached.
Introduced in version:	1.8.0 (r16549)
Removed in version:	still in use
Allowed values:	(integer)
Default value:	`86400 * 7` (MediaWiki 1.28+) `0` (1.8-1.27)
Other settings: Alphabetical \| By function

Details

Revision text may be cached in the main WAN cache to reduce load on external storage servers and object extraction overhead for frequently-loaded revisions.

Set to 0 to disable, or number of seconds before cache expiry.

Changes

Prior to MediaWiki 1.28 this setting defaulted to 0.