All proposed schema changes are at
http://meta.wikimedia.org/wiki/Proposed_Database_Schema_Changes

There is a need for some special pages to cache two links per line instead of
one. Examples include [[Special:Disambiguations]], [[Special:BrokenRedirects]],
[[Special:DoubleRedirects]], and possibly any other that are currently not
implemented because of the caching limitations. The table structure will be
identical to querycache table, except that it will have two additional fields
(namespace2 & title2), plus it might have a number of additional indexes to
facilitate better sorting.

CREATE TABLE querycache2 (
qc2_type char(32) NOT NULL,
qc2_value int(5) unsigned NOT NULL default '0',
qc2_namespace int(11) NOT NULL default '0',
qc2_title char(255) character set latin1 collate latin1_bin NOT NULL default ,
qc2_namespace2 int(11) NOT NULL default '0',
qc2_title2 char(255) character set latin1 collate latin1_bin NOT NULL default ,
KEY qc2_value (qc2_type,qc2_value),
KEY qc2_title (qc2_type,qc2_namespace,qc2_title),
KEY qc2_title2 (qc2_type,qc2_namespace2,qc2_title2)
)

Version: unspecified
Severity: enhancement
OS: Windows XP
Platform: PC
URL: http://meta.wikimedia.org/wiki/Proposed_Database_Schema_Changes#Two-link_QueryCache_table