Question

我有15个查询，可以动态地为页面上的表生成数据以用于报告。每个查询需要250到900毫秒，这意味着页面加载时间为4到13秒，具体取决于服务器负载。加载时间导致一些用户认为页面根本不会加载。

我想知道是否有某种方法可以简化查询以提供更可接受的加载时间。以下是其中一个问题：

             <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

尝试此查询

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

可能值得尝试在子选择上进行连接而不是使用IN。

这样的事情： -

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

如果您有很多不相互依赖的查询，请查看cfthread。这将允许您同时运行查询。

确保彻底测试。我曾经遇到过使用cfthread对数据库服务器产生负面影响的经历。

但它仍然值得一试。

Answer 4

我想在MySql中创建一个过程并使用我的sql中的参数调用它是最合适的。您还可以使用动态参数创建视图

如何提高ColdFusion MySQL的查询时间？

4 个答案: