Question

请找到以下查询，这需要更多时间，负载和/tmp/目录

上的空格

SELECT DISTINCT pil.pilsellersku,
  pil.pilname,
  pbi.pbicode,
  '',
  group_concat(DISTINCT ppt.pptcmtrfnum SEPARATOR ','),
  pbi.pbibrand,
  '',
  '',
  '',
  '',
  pil.pilicmdisplaycolor,
  pbi.pbidesc,
  pbi.pbiattrlabel1,
  pil.pilattrvalue1,
  pbi.pbiattrlabel2,
  pil.pilattrvalue2,
  pbi.pbiattrlabel3,
  pil.pilattrvalue3,
  '',
  pod.PODISBESTSELLER,
  pod.PODISNEWARRIVAL,
  pod.PODISCHOSEN,
  pit.pitzoomimage,
  pit.pitimage,
  pil.pilimage,
  pit.pitthumbnailimage,
  pit.pitthumbnailimage,
  pil.pilmrp,
  pod.PODMARGIN,
  pod.PODRETCOST,
  pbi.pbidiscvalue,
  pbi.pbidiscinvalue,
  pil.pilvat,
  pil.pilstockqty,
  pil.PILASRTGRP,
  sot.sotsomrfnum,
  group_concat(DISTINCT ppm.PPMPMTRFNUM SEPARATOR ','),
  ccg.ccgrfnum,
  pil.pilactive,
  pbi.pbiisgiftwrap,
  pbi.pbigiftwrapcharge,
  pbi.pbiispreffdate,
  pbi.pbissirfnum,
  pod.PODSTSL,
  '',
  '',
  pod.PODPVC,
  pod.PODWSPRICE,
  pod.PODODV,
  pod.PODSEQ,
  pod.PODSTCODE,
  pod.PODTAXATTRI,
  pod.PODPRODUNIT,
  pod.PODSTDCOST,
  pod.PODMATCODE,
  pod.PODWEEK,
  pod.PODYEAR,
  pod.PODDYRWK,
  pod.PODISBESTBUY,
  pbi.isonline,
  pbi.pbiseqnum,
  scm.scmcode
FROM Ismpbi pbi
LEFT JOIN ISMPIL pil
  ON pbi.pbirfnum = pil.pilpbirfnum
LEFT JOIN ISMPIT pit
  ON pbi.pbirfnum = pit.pitpbirfnum
    AND pit.pitviewseq = 1
LEFT JOIN ISMSOT sot
  ON sot.sotpbirfnum = pbi.pbirfnum
LEFT JOIN OTHPOD pod
  ON pod.podpbirfnum = pbi.pbirfnum
LEFT JOIN ISMPPM ppm
  ON ppm.ppmpbirfnum = pbi.pbirfnum
LEFT JOIN ISMPPT ppt
  ON ppt.pptpbirfnum = pbi.pbirfnum
LEFT JOIN ISMCCG ccg
  ON pbi.pbiccgrfnum = ccg.ccgrfnum
LEFT JOIN OCTSCM scm
  ON pbi.pbiscmrfnum = scm.scmrfnum
WHERE pbi.PBIBRAND = 35
GROUP BY pil.pilsellersku;

在上面的查询中，所有已加入的列和＆amp;其中条件列（即pbi.PBIBRAND＆amp; pit.pitviewseq）被编入索引。

并解释声明如下。

 +----+-------------+-------+--------+-------------------------------------------+--------------+---------+-------------------------+------+----------------------------------------------+ 
 | id | select_type | table | type   | possible_keys                             | key          | key_len | ref                     | rows | Extra                                        |
 +----+-------------+-------+--------+-------------------------------------------+--------------+---------+-------------------------+------+----------------------------------------------+ 
 |  1 | SIMPLE      | pbi   | ref    | IDX_PBIBRAND                              | IDX_PBIBRAND | 9       | const                   | 4420 | Usingwhere; Using temporary; Using filesort  |  
 |  1 | SIMPLE      | pil   | ref    | IDX_PILPBI                                | IDX_PILPBI   | 8       | apparel.pbi.PBIRFNUM    |    3 |                                              | 
 |  1 | SIMPLE      | pit   | ref    | IDX_PITPBI                                | IDX_PITPBI   | 8       | apparel.pbi.PBIRFNUM    |    9 |                                              |  
 |  1 | SIMPLE      | sot   | ref    | PRIMARY,SOTPBIRFNUM,IDX_SOTPBI            | PRIMARY      | 8       | apparel.pbi.PBIRFNUM    |    1 | Using index                                  |
 |  1 | SIMPLE      | pod   | ref    | PODPBIRFNUM,FK_POD_PBI,FK8B908042468F70B6 | PODPBIRFNUM  | 9       | apparel.pbi.PBIRFNUM    |    1 |                                              |
 |  1 | SIMPLE      | ppm   | ref    | IDX_PPMPBI                                | IDX_PPMPBI   | 8       | apparel.pbi.PBIRFNUM    |    1 |                                              |  
 |  1 | SIMPLE      | ppt   | ref    | PRIMARY,PPTPBIRFNUM,IDX_PPTPBI            | PRIMARY      | 8       | apparel.pbi.PBIRFNUM    |    1 | Using index                                  |  
 |  1 | SIMPLE      | ccg   | eq_ref | PRIMARY,CCGRFNUM                          | PRIMARY      | 8       | apparel.pbi.PBICCGRFNUM |    1 | Using index                                  | 
 |  1 | SIMPLE      | scm   | eq_ref | PRIMARY,SCMRFNUM                          | PRIMARY      | 8       | apparel.pbi.PBISCMRFNUM |    1 |                                              | 
 +----+-------------+-------+--------+-------------------------------------------+--------------+---------+-------------------------+------+----------------------------------------------+
 9 rows in set (0.00 sec)

以上查询花费的时间差不多是17分钟。服务器上的负载跨越15，磁盘级/tmp/方向消耗21 GB。

任何人都可以建议优化＆amp;修改查询以获得结果。

Answer 1

您的整体查询看起来简单明了...您的ISMPBI主表全部保留在其他表中，这对我来说意味着它们是更多的辅助/查找表。

为了提供帮助，我想了解以下内容......在您的选择中添加“STRAIGHT_JOIN”关键字

SELECT STRAIGHT_JOIN DISTINCT ....

对于您的ISMPBI表，请确保它在（PBIBRAND）上有索引

确保所有其他表在各自的“JOIN”列名称上都有索引...对于ISMPIT表，索引为（PITBIRFNUM，PITVIEWSEQ） - 因为您有PitViewSeq的AND子句

编辑 - 预查询测试选项..

您是否可以将其作为预查询运行，以查看IT对每个表的连接性能有什么影响......

         SELECT
              pbi.pbirfnum,
              pil.pilsellersku,
              group_concat(DISTINCT ppt.pptcmtrfnum SEPARATOR ',') as PPT_Values,
              group_concat(DISTINCT ppm.PPMPMTRFNUM SEPARATOR ',') as PPM_Values
           FROM 
              Ismpbi pbi
                 LEFT JOIN ISMPIL pil
                    ON pbi.pbirfnum = pil.pilpbirfnum
                 LEFT JOIN ISMPPM ppm
                    ON pbi.pbirfnum = ppm.ppmpbirfnum
                 LEFT JOIN ISMPPT ppt
                    ON pbi.pbirfnum = ppt.pptpbirfnum 
           WHERE 
              pbi.PBIBRAND = 35
           GROUP BY 
              pbi.pbirfnum,
              pil.pilsellersku

查询在/ tmp目录上占用更多空间以及更多负载和执行时的时间

1 个答案: