执行SQL发生错误！错误：Can't create/write to file '/tmp/#sql_84f_0.MYI' (Errcode: 28)，语句：SELECT scode,a.*,b.type,b.urlname FROM ay_content_sort a LEFT JOIN ay_model b ON a.mcode=b.mcode WHERE(a.acode='cn') AND(a.status=1) ORDER BY a.pcode,a.sorting,a.id