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我有一个相当大的查询，运行速度非常慢。一开始花了大约15分钟。然后我添加了所有适当的索引，并将其降至30秒。这是昨天。今天，我添加了2个新的连接，并且实际上将几个LEFT JOIN改为INNER，现在它需要运行20多分钟。MySQL查询运行非常缓慢
这是查询的EXPLAIN。我上传了一个Excel文件到SkyDrive，结果如下：http://cid-a32b31fdac0efced.office.live.com/view.aspx/mysqlexplain.xlsx
你会在这里看到有一个表mwd，它表示没有密钥。我检查过这张表，它的确有相应的索引。但是，这并不是我加入联盟的表，并且昨天运行良好。
新加入我创建可以在线路28和29
任何帮助将不胜感激可见。
编辑：编辑：我再次运行查询没有从mwd表的字段，即。 BIR3M，dealer_code，country_code，dsm_dealer_number，location_number，dms_type，sequence_number，version_no_edr，id_dms_type，version_no_dms，version_date_dms，现在在4秒运行！ （它仍然在加入这张桌子）
我知道它找不到mwd的密钥，即使在正确的字段中有一个索引，那么我该怎么做呢？
编辑：没有真的想发布查询，工作的东西。但这是加入的第一部分，这是造成延误的原因。这是很长......
SELECT mwd.dealer_code AS "BIR3M",
vm.chassis_number AS "VIN",
vm.Vehicle_ID,
vm.Registration,
COALESCE(vm.After_sale_type, "") AS "After Sales Type",
COALESCE(vm.Fabrication_No, "") AS "Fabrication No",
I.created_date AS "InvoiceDate",
I.department_id,
COALESCE(C.claim_number, "") AS "Intervention ID",
wb.booking_id AS "Booking ID",
wb.booking_date_time AS "Booking Date",
iba.account AS "Account Number",
acc.account_name AS "Account Description",
ibi.warranty_percentage AS "Payee Responsibility %",
IF(I.iscredit = 1, I.invoice_number, COALESCE(I2.invoice_number, "")) AS "Invoice Number",
IF(I.iscredit = 1, COALESCE(I2.invoice_number, "") , "") AS "Original Invoice Number",
"" AS "Part Reference",
"" AS "Part Description",
ibi.Booking_Time AS "Quantity",
0 AS "Cause Indicator",
"" AS "Stock Status",
ROUND(
(
CASE WHEN iBI.Claimed_Flag = 1 THEN (ibi.booking_time * ibi.warranty_labour_rate)
#(iBI.Claimed_Value * iBI.warranty_Labour_Rate)
WHEN iBi.Claimed_Flag = 0 THEN ibi.booking_time
#(iBI.Claimed_Value)
END
) # End
* CASE WHEN I.iscredit = 1 THEN -1 ELSE 1 END
,2) AS "RetailPrice",
ibia.discount AS "Discount Rate",
0.00 AS "Surcharge Rate",
ROUND(
ibi.Booking_Time * ibi.warranty_labour_rate * (1 - ibia.discount/100) *
COALESCE(mwc.commercial_cont, 100)/100 , 2)
AS "Cost Before Tax",
iba.account AS "Account",
CASE
WHEN ibi.warranty_percentage > 0 THEN "Warranty"
WHEN act.generic_type = 0 THEN "External"
WHEN act.generic_type = 1 THEN "Vehicle"
WHEN act.generic_type = 2 THEN "Internal"
WHEN act.generic_type = 3 THEN "Non Productive"
END AS "AccountType",
ibi.booking_time AS "Labour Time",
ibi.warranty_labour_rate AS "Hourly Rate",
0.00 AS "VAT Rate",
0.00 AS "VAT Total",
IBI.id AS "Invoice Booking Item ID",
IBI.operation_code AS "OPECOD",
IBI.job_description AS "Description",
CASE WHEN i.iscredit = 1 THEN 9 ELSE 0 END AS "Accounts Allocation",
COALESCE(mwc.contract_card_no, "") AS "Contract Card No",
COALESCE(mwc.vehicle_mileage, "") AS "Mileage",
COALESCE(mwc.delivery_date, "") AS "Delivery Date",
COALESCE(mwc.vo_number, "") AS "VO Number",
COALESCE(mwc.expense_code, "") AS "Expense Code",
COALESCE(mwc.catalog_function, "") AS "Catalog Function",
COALESCE(mwc.customer_complaint, "") AS "Customer Complaint",
COALESCE(mwc.commercial_cont, 100) AS "Commercial Contribution",
COALESCE(mwc.ots_otc_no, "") AS "OTS/OTC No",
COALESCE(mwc.supplier_code, "") AS "Supplier Code",
COALESCE(mwc.paint_code, "") AS "Paint Code",
COALESCE(mwc.off_road_breakdown, "") AS "Off Road Breakdown",
COALESCE(mwc.approval_no, "") AS "Approval No",
COALESCE(mwc.assistance_number, "") AS "Assistance Number",
COALESCE(mwc.customer_complaint_comment, "") AS "Customer Complaint Comment",
wb.booking_id AS "Repair Order Number",
wb.booking_date_time AS "Repair Order Date",
mwd.dealer_code,
mwd.country_code,
mwd.dsm_dealer_number,
mwd.location_number,
mwd.dms_type,
mwd.sequence_number,
mwd.version_no_edr,
mwd.id_dms_type,
mwd.version_no_dms,
mwd.version_date_dms,
COALESCE(mwc.customer_satisfied, "") AS "Customer Satisfied",
COALESCE(mwc.dealer_satisfied, "") AS "Dealer Satisfied",
COALESCE(mwc.parts_invoice_no, "") AS "Parts Invoice Number",
"" AS "Parts Type",
"" AS "Packaging Code",
CASE WHEN cr.Contact_ID IS NOT NULL THEN "P"
WHEN br.Business_ID IS NOT NULL THEN "S"
WHEN d.CODE IS NOT NULL THEN "S"
END AS "Customer Type",
"P" AS "Customer Vehicle Relation",
CASE WHEN cr.Contact_ID IS NOT NULL THEN cr.Surname
WHEN br.Business_ID IS NOT NULL THEN br.Company_Name
WHEN d.CODE IS NOT NULL THEN d.Description
END AS "Surname/Corporate Name",
"GB" AS "Language",
COALESCE(cr.Surname, "") AS "Second Name",
COALESCE(cr.Forename, "") AS "First Name",
COALESCE(cr.Date_Of_Birth, "") AS "DOB",
COALESCE(cr.Title, "") AS "Title",
COALESCE(vm.Registration_Date, "") AS "Registration Date",
CASE WHEN cr.Contact_ID IS NOT NULL THEN IF(cr.Letter_Contact_Allowed = 1, "", "A")
WHEN br.Business_ID IS NOT NULL THEN IF(br.Letter_Contact_Allowed = 1, "", "A")
WHEN d.CODE IS NOT NULL THEN ""
END AS "Mail Contact",
CASE WHEN cr.Contact_ID IS NOT NULL THEN IF(cr.EMail_Contact_Allowed = 1, "", "E")
WHEN br.Business_ID IS NOT NULL THEN IF(br.EMail_Contact_Allowed = 1, "", "E")
WHEN d.CODE IS NOT NULL THEN ""
END AS "EMail Contact",
CASE WHEN cr.Contact_ID IS NOT NULL THEN IF(cr.Fax_Contact_Allowed = 1, "", "F")
WHEN br.Business_ID IS NOT NULL THEN IF(br.Fax_Contact_Allowed = 1, "", "F")
WHEN d.CODE IS NOT NULL THEN ""
END AS "Fax Contact",
CASE WHEN cr.Contact_ID IS NOT NULL THEN IF(cr.Telephone_Contact_Allowed = 1, "", "T")
WHEN br.Business_ID IS NOT NULL THEN IF(br.Telephone_Contact_Allowed = 1, "", "T")
WHEN d.CODE IS NOT NULL THEN ""
END AS "Telephone Contact",
COALESCE(CASE WHEN cr.Contact_ID IS NOT NULL THEN
CASE WHEN cr.Preferred_Contact_Method = 1 THEN "A"
WHEN cr.Preferred_Contact_Method = 2 THEN "E"
WHEN cr.Preferred_Contact_Method = 9 THEN "F"
WHEN cr.Preferred_Contact_Method = 5 THEN "T"
END
WHEN br.Business_ID IS NOT NULL THEN
CASE WHEN br.Preferred_Contact_Method = 1 THEN "A"
WHEN br.Preferred_Contact_Method = 2 THEN "E"
WHEN br.Preferred_Contact_Method = 9 THEN "F"
WHEN br.Preferred_Contact_Method = 5 THEN "T"
END
WHEN d.CODE IS NOT NULL THEN "E"
END, "") AS "Preferred Support Type",
CASE WHEN cr.Contact_ID IS NOT NULL THEN cr.Address_1
WHEN br.Business_ID IS NOT NULL THEN br.Address_1
WHEN d.CODE IS NOT NULL THEN ""
END AS "Street Name",
CASE WHEN cr.Contact_ID IS NOT NULL THEN cr.Postcode
WHEN br.Business_ID IS NOT NULL THEN br.Postcode
WHEN d.CODE IS NOT NULL THEN ""
END AS "Post Code",
"GBR" AS Country,
CASE WHEN cr.Contact_ID IS NOT NULL THEN cr.Address_2
WHEN br.Business_ID IS NOT NULL THEN br.Address_2
WHEN d.CODE IS NOT NULL THEN ""
END AS "Address 1",
CASE WHEN cr.Contact_ID IS NOT NULL THEN cr.Address_3
WHEN br.Business_ID IS NOT NULL THEN br.Address_3
WHEN d.CODE IS NOT NULL THEN ""
END AS "Address 2",
CASE WHEN cr.Contact_ID IS NOT NULL THEN cr.Address_4
WHEN br.Business_ID IS NOT NULL THEN br.Address_4
WHEN d.CODE IS NOT NULL THEN ""
END AS "Address 3",
CASE WHEN cr.Contact_ID IS NOT NULL THEN cr.Email_Address
WHEN br.Business_ID IS NOT NULL THEN br.Email_Address
WHEN d.CODE IS NOT NULL THEN ""
END AS "Email",
CASE WHEN cr.Contact_ID IS NOT NULL THEN cr.Tel_num_home
WHEN br.Business_ID IS NOT NULL THEN br.Tel_num_primary
WHEN d.CODE IS NOT NULL THEN ""
END AS "Phone Number 1",
CASE WHEN cr.Contact_ID IS NOT NULL THEN cr.Tel_num_mobile
WHEN br.Business_ID IS NOT NULL THEN br.Tel_num_secondary
WHEN d.CODE IS NOT NULL THEN ""
END AS "Phone Number 2",
CASE WHEN cr.Contact_ID IS NOT NULL THEN cr.Tel_num_business
WHEN br.Business_ID IS NOT NULL THEN br.Tel_num_mobile
WHEN d.CODE IS NOT NULL THEN ""
END AS "Phone Number 3",
CASE WHEN cr.Contact_ID IS NOT NULL THEN cr.Fax_num
WHEN br.Business_ID IS NOT NULL THEN br.Fax_num
WHEN d.CODE IS NOT NULL THEN ""
END AS "Fax Number",
wb.Owner_ID AS "Owner",
1 AS "Labour Flag",
"WARRANTY"
FROM
I
INNER JOIN iba ON I.monetary_transaction_id = iba.monetary_transaction_id
INNER JOIN ibi ON ibi.booking_id = iba.booking_id AND ibi.job_group = iba.job_group AND ibi.sequence = iba.sequence
INNER JOIN G ON G.Booking_item_id= Ibi.ID
AND g.Type_ID = 1
INNER JOIN C ON C.ID = G.Claim_Booking_claim_ID
INNER JOIN WM ON WM.Warranty_Booking_Claim_ID = C.ID
INNER JOIN mwc ON mwc.ID = WM.Manufacturer_Warranty_Claim_ID
INNER JOIN ibia ON ibia.booking_item_id = ibi.id
AND ibia.sequence = ibi.sequence AND ibia.booking_account_id = iba.id AND ibia.sequence = iba.sequence
INNER JOIN wb ON wb.booking_id = ibi.booking_id
INNER JOIN a ON a.account_id = iba.account
INNER JOIN act ON act.type = a.type
LEFT JOIN ibev ON ibev.booking_item_id = ibi.id AND ibi.sequence = ibev.sequence
INNER JOIN vm ON wb.vehicle_id = vm.vehicle_id
INNER JOIN mwd ON mwd.department_id = I.department_id
INNER JOIN mt ON I.monetary_transaction_id = mt.master_monetary_transaction_id
INNER JOIN I2 ON mt.id = I2.monetary_transaction_id
INNER JOIN acc ON iba.account = acc.account_id
LEFT JOIN cr ON wb.owner_id = cr.contact_id
LEFT JOIN br ON wb.owner_id = br.business_id
LEFT JOIN d ON wb.owner_id = d.code
WHERE I.department_id IN (120, 322, 362)
AND I.created_date BETWEEN '2011-03-01 00:00:00' AND '2011-03-02 23:59:59'
AND ibev.booking_item_id IS NULL AND NOT ibi.booking_item_type_id IN (10,14) AND ibi.warranty_percentage > 0
AND wb.booking_id IN (454017, 454019, 454021, 454031)
说明看起来不错，没有临时性的东西，表扫描（ALL）都很低。你的MySQL服务器是否有足够的查询缓存来为你构建它。也许也提供给我们SQL。 – Pentium10 2011-03-17 15:06:02
已添加SQL查询。 MySQL服务器有大量的缓存，我确保这个查询是当时唯一运行的。 – anothershrubery 2011-03-17 15:16:17
您可以检查并查看是否回滚查询仍然运行缓慢的更改。如果可以，请为此创建一个解释，然后在旧+新版本上运行配置文件，并将所有详细信息与原始更快的查询一起发回。 – Pentium10 2011-03-17 15:45:13