Error

My blog site was working the first minute then i just got this error which i can understand and i would really love it if some can help.

WordPress database error: [Can’t create/write to file ‘/tmp/#sql_4ad2_0.MYI’ (Errcode: 30)]
SELECT DISTINCT * FROM wp_posts WHERE 1=1 AND post_date_gmt <= ‘2006-05-10 17:19:59’ AND (post_status = “publish” OR post_author = 1 AND post_status != ‘draft’ AND post_status != ‘static’) AND post_status != “attachment” GROUP BY wp_posts.ID ORDER BY post_date DESC LIMIT 0, 10

What does it mean?

my site: http://wiiland.net