On 04/30/2012 10:23 AM, Glyn Davies wrote:
Hi Folks,
I have problems with a couple of user generated queries that drastically
slow down the RT database.
The database is MySQL 5 running on a separate server from RT ( 4.0.5 )
The queries in question are of a similar format to the following,
Queue = 'Solutions'
AND ( Status = 'new' OR Status = 'open' )
AND ( Requestor.EmailAddress = '[email protected]' OR
Requestor.EmailAddress = '[email protected]' OR Requestor.EmailAddress = '
[email protected]' OR Requestor.EmailAddress = '[email protected]' OR
Requestor.EmailAddress = '[email protected]' OR Requestor.EmailAddress = '
[email protected]' OR Requestor.EmailAddress = '[email protected]' )
With only a few email addresses entered the query runs in an acceptable
time, however as the number increase the query almost forces the database
to a standstill.
Does anyone have any ideas on how I can make any improvements on
performance?
Thanks in advance.
Cheers,
Glyn
There is a bug in the way joins are calculated by DBIx::SearchBuilder in
some circumstances. If you log the SQL being run you will see numerous
joins to the same table if it's the same bug.
http://issues.bestpractical.com/Ticket/Display.html?id=18414
I attached a work around to that bug, it's not complete but it works for
us. Actually the patch was out of date as there was another side affect,
so I've attached a newer patch to the bug.
Note that even the newer patch has the issues Ruslan talked about in the
bug, I simply don't have time to cover all the angles required for a
full upstream fix.
Cheers, Jeff.
--
Jeff Fearn <[email protected]>
Senior Software Engineer
Red Hat
