WordPress database error: (Errcode: 30)]

woke up this morning to see this error on my site

WordPress database error: [Can’t create/write to file ‘/tmp/#sql_531dd_0.MYI’ (Errcode: 30)]
SELECT t.*, tt.*, tr.object_id FROM wppa_terms AS t INNER JOIN wppa_term_taxonomy AS tt ON tt.term_id = t.term_id INNER JOIN wppa_term_relationships AS tr ON tr.term_taxonomy_id = tt.term_taxonomy_id WHERE tt.taxonomy IN (‘category’, ‘post_tag’, ‘post_format’) AND tr.object_id IN (333, 331, 329, 326, 320, 279, 159, 128, 43, 39, 37, 35, 33) ORDER BY t.name ASC