Manual:$wgCachePrefix

From mediawiki.org
Profiling, testing and debugging: $wgCachePrefix
Custom value for the cache key prefix.
Introduced in version:1.19.0
Removed in version:still in use
Allowed values:(string) or false
Default value:false

Details[edit]

Overwrite the caching key prefix with custom value. This value is prefixed to the beginning of caching keys to differentiate between caching entries for different wikis stored in the same cache.

If this variable is set to false (default), the cache key defaults to being DBName-DBPrefix (Also known as the Wiki id). This is almost always sufficient, and it is unlikely one would want to set this value.

e.g. "cache key: DBNAME:resourceloader:[...]" to "cache key: $wgCachePrefix:resourceloader:[...]"