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我有一个查询。我已经为所有连接键创建了索引，预过滤了主表并选择了特定的行来选择，但它仍然需要很长时间才能显示（有时它会挂起）。我们应该怎么做才能提高性能？

SELECT *
FROM   t_responden a
       INNER JOIN t_kepemilikan_tik b
               ON a.res_id = b.res_id
       INNER JOIN t_televisi c
               ON a.res_id = c.res_id
       INNER JOIN t_telepon_hp d
               ON a.res_id = d.res_id
       INNER JOIN t_radio e
               ON a.res_id = e.res_id
       INNER JOIN t_media_cetak f
               ON a.res_id = f.res_id
       INNER JOIN t_internet g
               ON a.res_id = g.res_id
       LEFT JOIN t_mst_pendidikan n
              ON a.res_pendidikan_kk = n.kd_pendidikan
       LEFT JOIN t_mst_pendidikan o
              ON a.res_pendidikan = o.kd_pendidikan
       LEFT JOIN t_mst_penghasilan p
              ON a.res_penghasilan = p.kd_penghasilan

       LEFT JOIN t_mst_aksesibilitas q
              ON a.res_aksesibilitas = q.kd_akses
       LEFT JOIN t_mst_mobilitas r
              ON a.res_mobilitas = r.kd_mobilitas
       LEFT JOIN t_mst_pekerjaan s
              ON a.res_pekerjaan = s.kode
       LEFT JOIN t_mst_pengeluaran t
              ON a.res_pengeluaran = t.kode

       INNER JOIN t_pernyataan h
               ON a.res_id = h.res_id

       INNER JOIN (SELECT * FROM t_mst_prop WHERE kode IN ( '3200', '1600', '1800', '3600' )) i
               ON a.res_propinsi = i.kode

       INNER JOIN (SELECT * FROM t_mst_kabkota WHERE kode_prop IN ( '3200', '1600', '1800', '3600' )) j
               ON ( a.res_kabkota = j.kode
                    AND a.res_propinsi = j.kode_prop )

       INNER JOIN (SELECT * FROM t_mst_kec WHERE kode_prop IN ( '3200', '1600', '1800', '3600' )) k
               ON ( a.res_kecamatan = k.kode
                    AND a.res_kabkota = k.kode_kabkota
                    AND a.res_propinsi = k.kode_prop )

       INNER JOIN (SELECT * FROM t_mst_desa WHERE kode_prop IN ( '3200', '1600', '1800', '3600' ))l
               ON ( a.res_keldesa = l.kode
                    AND a.res_kabkota = l.kode_kabkota
                    AND a.res_propinsi = l.kode_prop
                    AND l.kode_kec = a.res_kecamatan )

WHERE  a.res_tahunsurvei = 2013
       AND res_propinsi IN ( '3200', '1600', '1800', '3600' )
ORDER  BY 1
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1 回答 1

1 
SELECT STRAIGHT_JOIN
      *
   FROM   
      t_responden a
         INNER JOIN t_kepemilikan_tik b
            ON a.res_id = b.res_id
         INNER JOIN t_televisi c
            ON a.res_id = c.res_id
         INNER JOIN t_telepon_hp d
            ON a.res_id = d.res_id
         INNER JOIN t_radio e
            ON a.res_id = e.res_id
         INNER JOIN t_media_cetak f
            ON a.res_id = f.res_id
         INNER JOIN t_internet g
            ON a.res_id = g.res_id
         LEFT JOIN t_mst_pendidikan n
            ON a.res_pendidikan_kk = n.kd_pendidikan
         LEFT JOIN t_mst_pendidikan o
            ON a.res_pendidikan = o.kd_pendidikan
         LEFT JOIN t_mst_penghasilan p
            ON a.res_penghasilan = p.kd_penghasilan
         LEFT JOIN t_mst_aksesibilitas q
            ON a.res_aksesibilitas = q.kd_akses
         LEFT JOIN t_mst_mobilitas r
            ON a.res_mobilitas = r.kd_mobilitas
         LEFT JOIN t_mst_pekerjaan s
            ON a.res_pekerjaan = s.kode
         LEFT JOIN t_mst_pengeluaran t
            ON a.res_pengeluaran = t.kode
         INNER JOIN t_pernyataan h
            ON a.res_id = h.res_id

         INNER JOIN t_mst_prop i
            ON a.res_propinsi = i.kode
         INNER JOIN t_mst_kabkota j
               ON  a.res_propinsi = j.kode_prop 
               AND a.res_kabkota = j.kode
         INNER JOIN t_mst_kec k
               ON a.res_propinsi = k.kode_prop
               AND a.res_kecamatan = k.kode
               AND a.res_kabkota = k.kode_kabkota
         INNER JOIN t_mst_desa l
               ON  a.res_propinsi = l.kode_prop
               AND a.res_keldesa = l.kode
               AND a.res_kabkota = l.kode_kabkota
               AND a.res_kecamatan = l.kode_kec
   WHERE  
          a.res_tahunsurvei = 2013
      AND a.res_propinsi IN ( '3200', '1600', '1800', '3600' )
   ORDER BY 
      1

您应该在您的 t_responden 表 ON ( res_tahunsurvei, res_propinsi) 上有一个索引，以匹配您的 where 资格标准。此外，您通过子选择应用 IN 的其他表的所有内部连接都会杀死您。您已经在 where 中限制了“kode”，因此如果您将其应用为您的加入，您应该会很好。

此外，由于所有其他表似乎都更“查找”，我添加了“STRAIGHT_JOIN”来告诉 MySQL 按您列出的表的顺序查询

于 2013-06-27T01:18:38.007 回答