查询优化左外连接 7 个表 - SQL Server

Question

需要帮助以更快地执行和优化以下内容。

在附上的2张图片中找到执行计划.. 各表数据如下：

• 公司 - 25 行
• warranty_period - 878 行
• company_claimtype - 216 行
• claim_type - 25 行
• 客户 - 15980 行
• auto_handle - 25 行
• auto_handle_condition - 31 行
• PART_REQUIRED_RETURN - 4521 行

以下查询花费了将近 12 分钟的时间来执行，它只包含上述所有表的左外连接：

select
    company0_.ID as ID1_9_0_,
    warrantype1_.ID as ID1_36_1_,
    partsrequi2_.ID as ID1_20_2_,
    claimtype4_.ID as ID1_8_3_,
    autohandle5_.ID as ID1_4_4_,
    autohandle6_.ID as ID1_5_5_,
    customer7_.ID as ID1_14_6_,
    company0_.CREATED as CREATED2_9_0_,
    company0_.UPDATED as UPDATED3_9_0_,
    company0_.AUTO_REJECT_USER as AUTO_REJ4_9_0_,
    company0_.CLAIM_CREDIT_ORDER_HISTORY as CLAIM_CR5_9_0_,
    company0_.CLAIM_ORDER_HISTORY as CLAIM_OR6_9_0_,
    company0_.COMPANY_CODE as COMPANY_7_9_0_,
    company0_.COMPANY_NAME as COMPANY_8_9_0_,
    company0_.CONNECTED_TO_ERP as CONNECTE9_9_0_,
    company0_.DEFAULT_CUSTOMER_ID as DEFAULT16_9_0_,
    company0_.DATE_FORMAT as DATE_FO10_9_0_,
    company0_.DISPLAY_WORK_LOCATION as DISPLAY11_9_0_,
    company0_.DISTANCE_UNIT as DISTANC12_9_0_,
    company0_.ENABLE_SHIPPING_LABEL as ENABLE_13_9_0_,
    company0_.HANDLE_CREDIT_INVOICES as HANDLE_14_9_0_,
    company0_.RETURNS_PARTS_DAYS as RETURNS15_9_0_,
    warrantype1_.CREATED as CREATED2_36_1_,
    warrantype1_.UPDATED as UPDATED3_36_1_,
    warrantype1_.COMPANY_ID as COMPANY_8_36_1_,
    warrantype1_.PERIOD_CONSUMER as PERIOD_C4_36_1_,
    warrantype1_.PERIOD_PROFESSIONAL as PERIOD_P5_36_1_,
    warrantype1_.PRODUCT_GROUP as PRODUCT_6_36_1_,
    warrantype1_.PRODUCT_NO as PRODUCT_7_36_1_,
    warrantype1_.COMPANY_ID as COMPANY_8_36_0__,
    warrantype1_.ID as ID1_36_0__,
    partsrequi2_.CREATED as CREATED2_20_2_,
    partsrequi2_.UPDATED as UPDATED3_20_2_,
    partsrequi2_.COMPANY_ID as COMPANY_5_20_2_,
    partsrequi2_.PRODUCT_NO as PRODUCT_4_20_2_,
    partsrequi2_.COMPANY_ID as COMPANY_5_20_1__,
    partsrequi2_.ID as ID1_20_1__,
    claimtype4_.CREATED as CREATED2_8_3_,
    claimtype4_.UPDATED as UPDATED3_8_3_,
    claimtype4_.CATEGORY as CATEGORY4_8_3_,
    claimtype4_.CLAIM_TYPE as CLAIM_TY5_8_3_,
    claimtype4_.SORT_ORDER as SORT_ORD6_8_3_,
    claimtype4_.TEXT_KEY as TEXT_KEY7_8_3_,
    claimtypes3_.COMPANY_ID as COMPANY_2_10_2__,
    claimtypes3_.CLAIMTYPE_ID as CLAIMTYP1_10_2__,
    autohandle5_.CREATED as CREATED2_4_4_,
    autohandle5_.UPDATED as UPDATED3_4_4_,
    autohandle5_.[ACTION] as ACTION4_4_4_,
    autohandle5_.[ACTIVE] as ACTIVE5_4_4_,
    autohandle5_.[ASSIGN] as ASSIGN6_4_4_,
    autohandle5_.[COMPANY_ID] as COMPANY_8_4_4_,
    autohandle5_.[NAME] as NAME7_4_4_,
    autohandle5_.[COMPANY_ID] as COMPANY_8_4_3__,
    autohandle5_.ID as ID1_4_3__,
    autohandle6_.CREATED as CREATED2_5_5_,
    autohandle6_.UPDATED as UPDATED3_5_5_,
    autohandle6_.AUTO_HANDLE_ID as AUTO_HAN7_5_5_,
    autohandle6_.[OPERATOR] as OPERATOR4_5_5_,
    autohandle6_.[TYPE] as TYPE5_5_5_,
    autohandle6_.[VALUE] as VALUE6_5_5_,
    autohandle6_.AUTO_HANDLE_ID as AUTO_HAN7_5_4__,
    autohandle6_.ID as ID1_5_4__,
    customer7_.CREATED as CREATED2_14_6_,
    customer7_.UPDATED as UPDATED3_14_6_,
    customer7_.COMPANY_ADDRESS as COMPANY_4_14_6_,
    customer7_.STREET as STREET5_14_6_,
    customer7_.ZIPCODE as ZIPCODE6_14_6_,
    customer7_.COMPANY_ID as COMPANY_9_14_6_,
    customer7_.CUSTOMER_NO as CUSTOMER7_14_6_,
    customer7_.NAME as NAME8_14_6_ 
from
    COMPANY company0_ 
left outer join
    WARRANTY_PERIOD warrantype1_ 
        on company0_.ID=warrantype1_.COMPANY_ID 
left outer join
    PART_REQUIRED_RETURN partsrequi2_ 
        on company0_.ID=partsrequi2_.COMPANY_ID 
left outer join
    COMPANY_CLAIMTYPE claimtypes3_ 
        on company0_.ID=claimtypes3_.COMPANY_ID 
left outer join
    CLAIM_TYPE claimtype4_ 
        on claimtypes3_.CLAIMTYPE_ID=claimtype4_.ID 
left outer join
    AUTO_HANDLE autohandle5_ 
        on company0_.ID=autohandle5_.[COMPANY_ID] 
left outer join
    AUTO_HANDLE_CONDITION autohandle6_ 
        on autohandle5_.ID=autohandle6_.AUTO_HANDLE_ID 
left outer join
    CUSTOMER customer7_ 
        on company0_.DEFAULT_CUSTOMER_ID=customer7_.ID

Answer 1

我觉得特别奇怪的是，您从 PART_REQUIRED_RETURN 获得了大约 585k 条记录，然后将它们标记在一起，但是当服务器添加 AUTO_HANDLE 数据时，事情突然增加到 210 万条记录。你确定你的加入考虑了整个PK吗？正如您现在的查询所示，我假设 ID 是 AUTO_HANDLE 的 PK，但数字似乎与此相矛盾。添加AUTO_HANDLE_CONDITION 数据时会发生类似的情况。

最终您将读取 330 万行，或大约 4.5Gb 的数据。我认为你不能指望把它缩短到几秒钟。