[英]MySQL Select Query Too Slow \
我有一個表,其中有90個數據字段和1500條記錄。 當我執行Select查詢並嘗試提取整個表記錄時,它變得太慢。 即使我將其限制為100條記錄,也要花費30秒以上的時間。
任何建議,將不勝感激。
查詢如下:
SELECT
ID, FirstName, LastName,
date_format( InitialConsultDate , '%m/%d/%Y' ) AS InitialConsultDate,
Address1, Address2, City, State, Zip, HomeNumber, WorkNumber, CellNumber, Email,
Height, Weight, Age, Sex, Married, BirthDate, UnderPhysicianCare, MedicalIssue,
Smoking, Exercise, NumberTimesPerWeek, Dieting, AdequateWater, Cellulite,
BiggestConcern, CustomerDeal, LipoSessionsPurchased, FacialSessionsPurchased,
NutritionSessionsPurchased, ReferredBy, AdditionalNotes, WeightEvaluationDate1,
Weight1, WeightEvaluationDate2, Weight2, WeightEvaluationDate3, Weight3, BMI,
ClientBeforePictureFront, ClientAfterPictureFront1, ClientAfterPictureFront2,
ClientBeforePictureLeftSide, ClientAfterPictureLeftSide1, ClientAfterPictureLeftSide2,
ClientBeforePictureRightSide, ClientAfterPictureRightSide1,
ClientAfterPictureRightSide2, ClientMeasurementH1, ClientMeasurementH2,
ClientMeasurementH3, Area1Before, Area1After, Area2Before, Area2After,
Area3Before, Area3After, IsOldCustomer, ClientAfterFront3, ClientAfterFront4,
ClientAfterFront5, ClientAfterLeftSide3, ClientAfterLeftSide4,
ClientAfterLeftSide5, ClientAfterRightSide3, ClientAfterRightSide4,
ClientAfterRightSide5, ClientBeforeBack, ClientAfterBack1, ClientAfterBack2,
ClientAfterBack3, ClientAfterBack4, ClientAfterBack5, Area1After1, Area1After2,
Area1After3, Area1After4, Area1After5, Area2After1, Area2After2, Area2After3,
Area2After4, Area2After5, Area3After1, Area3After2, Area3After3, Area3After4,
Area3After5
FROM customer
WHERE IsOldCustomer ='0'
ORDER BY ID
您應該使用索引來優化數據搜索,例如:
CREATE INDEX idx_name ON your_table (field_name);
CREATE UNIQUE INDEX idx_name ON your_table (field_name);
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