WordPress database error on startpage

I’m having a similar problem. I get this error message:

WordPress database error: [Can't create/write to file '/tmp/#sql_18bd_2.MYI' (Errcode: 5)]

Followed by:

SELECT DISTINCT * FROM wp_posts WHERE 1=1 AND post_date_gmt <= '2005-11-28 15:17:59' AND (post_status = "publish") AND post_date >= '2005-11-23 12:31:40' GROUP BY wp_posts.ID ORDER BY post_date DESC

Any clue? I haven’t done anything other than regular posting (i.e. I haven’t been changing code)

No, your problem is totally different (so next time start your own thread, otherwise nobody will see it) or better do a search for the error msg you got. Here is the answer:
http://wordpress.org/support/topic/28823