如何提高ColdFusion MySQL的查詢時間？

Question

我有15個查詢，可以動態生成頁面上的表數據以用於報告。 每個查詢需要250到900毫秒，這意味着頁面加載時間為4到13秒，具體取決於服務器負載。 加載時間導致一些用戶認為頁面根本不會加載。

我想知道是否有某種方法可以簡化查詢以提供更可接受的加載時間。 以下是其中一個查詢：

             <cfquery datasource="MeetingDB"  name="One">
              SELECT COUNT( meetingID ) AS countatron
              FROM case_meeting
              WHERE meetingID
              IN (

              SELECT DISTINCT a.meetingID
              FROM case_meeting a
              INNER JOIN meeting b ON a.meetingID = b.meetingID
              WHERE b.categoryID =  '1' 
              AND SUBSTRING( meetingCode, 5, 2 ) 
              BETWEEN 12 
              AND 22 
              AND SUBSTRING( meetingCode, 7, 2 ) 
              BETWEEN 01 
              AND 12 
              AND SUBSTRING( meetingCode, 9, 2 ) 
              BETWEEN 01 
              AND 31
              )
              AND caseID
              IN (
              '1',  '2',  '3', '28',  '29',  '30', '39', '40', '45'
              )
              GROUP BY meetingID
              HAVING COUNT( caseID ) > 0 AND COUNT( caseID ) < 2
              </cfquery>

              <td><cfoutput> #One.recordcount# </cfoutput></td>

Answer 1

試試這個查詢

SELECT COUNT( a.meetingID ) AS countatron
          FROM case_meeting a, case_meeting b
          WHERE a.meetingID = b.meetingID 
          AND b.categoryID =  '1' 
          AND SUBSTRING( b.meetingCode, 5, 2 ) 
          BETWEEN 12 
          AND 22 
          AND SUBSTRING( b.meetingCode, 7, 2 ) 
          BETWEEN 01 
          AND 12 
          AND SUBSTRING( b.meetingCode, 9, 2 ) 
          BETWEEN 01 
          AND 31
          AND b.caseID
          IN (
          '1',  '2',  '3', '28',  '29',  '30', '39', '40', '45'
          )
          GROUP BY a.meetingID
          HAVING COUNT( a.caseID ) = 1

Answer 2

可能值得嘗試在子選擇上進行連接而不是使用IN。

像這樣： -

SELECT COUNT( case_meeting.meetingID ) AS countatron
FROM case_meeting
INNER JOIN (
SELECT DISTINCT a.meetingID
FROM case_meeting a
INNER JOIN meeting b ON a.meetingID = b.meetingID
WHERE b.categoryID =  '1' 
AND SUBSTRING( meetingCode, 5, 2 ) BETWEEN 12 AND 22 
AND SUBSTRING( meetingCode, 7, 2 ) BETWEEN 01 AND 12 
AND SUBSTRING( meetingCode, 9, 2 ) BETWEEN 01 AND 31
) Sub1
ON case_meeting.meetingID = Sub1.meetingID
INNER JOIN (
SELECT meetingID, COUNT( caseID ) AS MeetingCaseCount
FROM case_meeting
WHERE  caseID IN ('1',  '2',  '3', '28',  '29',  '30', '39', '40', '45')
GROUP BY meetingID
) Sub2
ON case_meeting.meetingID = Sub2.meetingID
WHERE  Sub2.MeetingCaseCount > 0 AND Sub2.MeetingCaseCount < 2
GROUP BY case_meeting.meetingID

Answer 3

如果你有很多不相互依賴的查詢，那么看看cfthread。 這將允許您同時運行查詢。

確保徹底測試。 我曾經遇到過使用cfthread對數據庫服務器產生負面影響的經歷。

但它仍然值得一試。

Answer 4

我想在MySql中創建一個過程並使用我的sql中的參數調用它是最合適的。 您還可以使用動態參數創建視圖