MySQL更新查詢太慢

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我有一個更新查詢需要超過2小時才能執行。查詢根據某些情況同時更新三個表。根據業務需求更新查詢並不複雜。如何優化這個查詢：查詢是如下：MySQL更新查詢太慢

UPDATE 
     atmissuerdata a1 
inner join 
     cbsissuerdata c1 ON ROW(a1.transactionnumber,a1.cardnumber) =ROW(c1.approvalnumber,c1.cardnumber) 
INNER JOIN 
     switchissuerdata s1 ON ROW(a1.transactionnumber,a1.cardnumber) =ROW(s1.approvalnumber,s1.cardnumber) 
INNER JOIN 
     atmlevel1 al1 ON al1.id=a1.id INNER JOIN cbslevel1 cl1 ON cl1.id=c1.id 
INNER JOIN 
     switchlevel1 sl1 ON sl1.id=s1.id 
SET 
     a1.reconstatus = 
         CASE 
       WHEN ( ROW(a1.transactionnumber,a1.cardnumber) = ROW(c1.approvalnumber,c1.cardnumber) AND 
         ROW(a1.transactionnumber,a1.cardnumber) = ROW(s1.approvalnumber,s1.cardnumber)) AND 
       ( a1.TransactionAmount = c1.TransactionAmountDr AND a1.TransactionAmount = s1.TransactionAmount1 ) 
       THEN 'Y' 
       WHEN 
         (ROW(a1.transactionnumber,a1.cardnumber) = ROW(c1.approvalnumber,c1.cardnumber) 
         AND ROW(a1.transactionnumber,a1.cardnumber) = ROW(s1.approvalnumber,s1.cardnumber)) 
         AND ( a1.TransactionAmount <> c1.TransactionAmountDr OR a1.TransactionAmount <> s1.TransactionAmount1) 
       THEN 'D' 
       ELSE 
         a1.reconstatus END, 
     c1.reconstatus= 
       CASE WHEN (ROW(a1.transactionnumber,a1.cardnumber) = ROW(c1.approvalnumber,c1.cardnumber) 
         AND ROW(a1.transactionnumber,a1.cardnumber) = ROW(s1.approvalnumber,s1.cardnumber)) 
         AND (a1.TransactionAmount = c1.TransactionAmountDr AND a1.TransactionAmount = s1.TransactionAmount1) 
       THEN 'Y' 
       WHEN ( ROW(a1.transactionnumber,a1.cardnumber) = ROW(c1.approvalnumber,c1.cardnumber) AND 
         ROW(a1.transactionnumber,a1.cardnumber) = ROW(s1.approvalnumber,s1.cardnumber)) AND 
       ( a1.TransactionAmount <> c1.TransactionAmountDr OR a1.TransactionAmount <> s1.TransactionAmount1 ) 
       THEN 'D' 
       ELSE 
         c1.reconstatus END , 
     s1.reconstatus= 
       CASE WHEN (ROW(a1.transactionnumber,a1.cardnumber) = ROW(c1.approvalnumber,c1.cardnumber) 
       AND ROW(a1.transactionnumber,a1.cardnumber) = ROW(s1.approvalnumber,s1.cardnumber)) 
       AND ( a1.TransactionAmount = c1.TransactionAmountDr AND a1.TransactionAmount = s1.TransactionAmount1) 
       THEN 'Y' 
       WHEN (ROW(a1.transactionnumber,a1.cardnumber) = ROW(c1.approvalnumber,c1.cardnumber) 
         AND ROW(a1.transactionnumber,a1.cardnumber) = ROW(s1.approvalnumber,s1.cardnumber)) 
         AND ( a1.TransactionAmount <> c1.TransactionAmountDr OR a1.TransactionAmount <> s1.TransactionAmount1) 
       THEN 'D' 
       ELSE s1.reconstatus END;

請幫我..

來源

2013-08-07 Nitesh Kumar

我會移動的業務邏輯出的SQL語句。在代碼中執行檢查，然後執行「UPDATE atmissuerdata SET reconstats ='Y'WHERE id IN（1,2,5,4，...）」，「UPDATE atmissuerdata SET reconstats ='N'WHERE id IN（1,2,5,4，...）「

另外你是否正確使用索引？在我腦海中，「內連接cbsissuerdata c1 ON ROW（a1.transactionnumber，a1.cardnumber）= ROW（c1.approvalnumber，c1.cardnumber）」可能很慢。嘗試在連接上使用ID並在其上有一個索引。

來源

2013-08-07 11:56:49 attrib

我不能使用三次更新，因爲所有狀態都需要同時更新。我們只選擇N個數據，如果下一次將一個表中的數據更新爲Y，則相應的N個數據將不會被使用。所以，查詢將不得不使用相同的。 –

MySQL更新查詢太慢

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