From Village pump on en.wiki:

Getting DB errors on my watchlist as follows:

A database query syntax error has occurred. This could be because of an illegal search query (see Searching Wikipedia), or it may indicate a bug in the software. The last attempted database query was:

SELECT DISTINCT wl_page,talk.cur_id AS id,talk.cur_namespace AS namespace,talk.cur_title AS title, talk.cur_user AS user,talk.cur_comment AS comment,talk.cur_user_text AS user_text, talk.cur_timestamp AS timestamp,talk.cur_minor_edit AS minor_edit,talk.cur_is_new AS is_new FROM cur as page, cur as talk, watchlist WHERE wl_user=5862 AND wl_page=page.cur_id AND page.cur_title=talk.cur_title AND talk.cur_namespace | 1=page.cur_namespace | 1 ORDER BY talk.cur_timestamp DESC LIMIT 50

from within function "wfSpecialWatchlist". MySQL returned error "1030: Got error 127 from table handler".

Help! -Martin