Allow searching for short terms in mediawiki

Edit /etc/my.cnf, add a line

ft_min_word_len=1

below

[mysqld]

Then

/etc/init.d mysql restart
mysql 
use wikidb;
REPAIR TABLE searchindex QUICK;

See also

http://www.mediawiki.org/wiki/Manual:FAQ#.E2.80.A6is_a_search_for_a_short_keyword_giving_no_hits.3F