How to improve ColdFusion MySQL query time? - mysql

Question

I have 15 queries that generate data for a table on a page dynamically for the purpose of reports. Each query takes between 250 and 900ms which means a page loading time of 4 to 13 seconds depending on server load. The loading time is causing some users to the think the page is not going to load at all.
I was wondering if there was some way I could streamline the queries to give a more acceptable loading time. Here is one of the queries:
<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

Try this query
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

Might be worth trying to do joins on subselects rather than using IN.
Something like this:-
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

If you have a lot of queries that don't depend on each other, then take a look at cfthread. This will allow you to run the queries concurrently.
Make sure you test it thoroughly. I've had one experience where the use of cfthread had adverse effects on a database server.
It's still worth a shot though.

Answer 4

i suppose creating a procedure in the MySql and invoking it with arguments from my sql is most appropriate. you could also create views with dynamic param