Manual:$wgInterwikiCache

Interwiki: $wgInterwikiCache
Set to a file path to enable the CDB interwiki cache.
Introduced in version:	1.6.0 (r12805)
Removed in version:	still in use
Allowed values:	string or false
Default value:	false

Other settings: Alphabetical | By Function

Details

CDB interwiki caching consists of the following four settings:

$wgInterwikiCache

This setting specifies path to constant database file. This CDB database is generated by dumpInterwiki.php from maintenance and has such key formats:

• dbname:key - a simple key (e.g. enwiki:meta)
• _sitename:key - site-scope key (e.g. wiktionary:meta)
• __global:key - global-scope key (e.g. __global:meta)
• __sites:dbname - site mapping (e.g. __sites:enwiki)

Sites mapping just specifies site name, other keys provide "local url" data layout.

$wgInterwikiScopes 

This setting specifies the number of domains to check for messages:

1. - Just wiki(db)-level
2. - wiki and global levels
3. - site levels

$wgInterwikiFallbackSite 

This setting is used if unable to resolve from the cache.

This appears to use a constant database file (created by one of the maintenance scripts) to provide a list of valid interwiki prefixes and corresponding URLs.

Since 1.19 it is possible to get the list of cached interwiki prefixes, used in the API and Extension:Interwiki extension.

See also

• Interwiki_cache#CDB_interwiki_cache
• Manual:Interwiki table