Problem with database..

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Database error: [Can’t create/write to file ‘/tmp/#sql_1f25_0.MYI’ (Errcode: 13)]
SELECT DISTINCT * FROM wp_posts WHERE 1=1 AND post_date_gmt <= ‘2004-09-02 09:55:59’ AND (post_status = “publish”) GROUP BY wp_posts.ID ORDER BY post_date DESC LIMIT 10
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Do you know what it means?