Manual:$wgMainCacheType

Details
Object cache setting which replaced $wgUseMemCached.

Here are the available cache constants, as defined in "Defines.php":
 * – Use $wgMainCacheType, $wgMessageCacheType or $wgParserCacheType if they are set to something other than  or  . Otherwise use.
 * – Do not cache
 * – Store objects in the database table objectcache table.
 * Warning: This could potentially be slower than no caching for $wgMainCacheType


 * – memcached, must specify servers in $wgMemCachedServers
 * – APC --> XCache (--> wincache, if on Windows), trying each in this order, using whichever is available.
 * Note: If using  with APC, increasing apc.shm_size may improve performance

Custom cache types
You can also create other cache configurations in addition to the built in CACHE_ constants by adding them to $wgObjectCaches. For example, to use redis as your cache (which doesn't have a built in CACHE_XXX constant) you can do:

The MediaWiki-Vagrant appliance runs a redis service and uses this configuration.