在mysql中啓用slow_query_log後，mysql查詢速度慢加入

Question

。我發現下面的查詢是15秒或更長的最慢查詢之一。我怎樣才能優化這個查詢。所有的表InnoDB和 服務器：服務器版本：5.6感謝您

EXPLAIN EXTENDED SELECT 
    ntv_staffs.fname, 
    ntv_staffs.id, 
    ntv_staffs.mname, 
    ntv_staffs.profile_pic, 
    ntv_staffs.lname, 
    ntv_staff_office.cug, 
    ntv_staff_office.extension, 
    ntv_staff_office.off_email, 
    ntv_staff_office.job_title, 
    ntv_designations.`name` as designation_name, 
    ntv_branches.`name` as branch_name, 
    ntv_departments.`name` as department_name, 
    ntv_departments.id as department_id 
    FROM 
    ntv_staffs 
    INNER JOIN ntv_staff_office ON ntv_staffs.id = ntv_staff_office.pid 
    INNER JOIN ntv_departments ON ntv_staff_office.department_id = ntv_departments.id 
    INNER JOIN ntv_branches ON ntv_staff_office.branch_id = ntv_branches.id 
    INNER JOIN ntv_designations ON ntv_staff_office.designation = ntv_designations.id 
    where ntv_staffs.id='662'; 


+----+-------------+------------------+--------+---------------+---------+---------+----------------------------------------------+------+----------+-------------+ 
| id | select_type | table   | type | possible_keys | key  | key_len | ref           | rows | filtered | Extra  | 
+----+-------------+------------------+--------+---------------+---------+---------+----------------------------------------------+------+----------+-------------+ 
| 1 | SIMPLE  | ntv_staffs  | const | PRIMARY  | PRIMARY | 4  | const          | 1 | 100.00 |    | 
| 1 | SIMPLE  | ntv_staff_office | ALL | NULL   | NULL | NULL | NULL           | 247 | 100.00 | Using where | 
| 1 | SIMPLE  | ntv_branches  | eq_ref | PRIMARY  | PRIMARY | 4  | abc_portal_new.sks_staff_office.branch_id  | 1 | 100.00 |    | 
| 1 | SIMPLE  | ntv_designations | eq_ref | PRIMARY  | PRIMARY | 4  | abc_portal_new.sks_staff_office.designation | 1 | 100.00 | Using where | 
| 1 | SIMPLE  | ntv_departments | eq_ref | PRIMARY  | PRIMARY | 4  | abc_portal_new.sks_staff_office.department_id | 1 | 100.00 |    | 
+----+-------------+------------------+--------+---------------+---------+---------+----------------------------------------------+------+----------+-------------+ 

Answer 1

嘗試設置B樹索引的ntv_staff_office.pid。