[rt-users] any page showing a user drop down in a ticket is loading slow

[Adam Hobaugh]

On 12/18/2013 11:43 AM, Kevin Falcone wrote:
> On Tue, Dec 17, 2013 at 02:53:53PM -0500, Adam Hobaugh wrote:
>> I just updated from 4.0.10 to 4.2.1 and it seems to be working well
>> except when I am in a ticket, any page that shows a user drop down,
>> ie display and people load incredible slowly. I enabled slow query
>> logging and below are the two queries that appear to be causing the
>> problem. I appreciate any help in resolving this. 10 second load
>> times is rough. Please let me know what further information is
>> needed.
> The slow query logs are most helpful when you then run EXPLAIN on the
> query so you know why the database is having trouble.
Here is the EXPLAIN for the two queries.

mysql> EXPLAIN SELECT DISTINCT main.* FROM Users main CROSS JOIN ACL 
ACL_3 JOIN Principals Principals_1  ON ( Principals_1.id = main.id ) 
JOIN CachedGroupMembers CachedGroupMembers_2  ON ( 
CachedGroupMembers_2.MemberId = Principals_1.id ) JOIN 
CachedGroupMembers CachedGroupMembers_4  ON ( 
CachedGroupMembers_4.MemberId = Principals_1.id )  WHERE 
((ACL_3.ObjectType = 'RT::Queue' AND ACL_3.ObjectId   = 3) OR 
(ACL_3.ObjectType = 'RT::System') OR (ACL_3.ObjectType = 'RT::Queue' AND 
ACL_3.ObjectId   = 3) OR (ACL_3.ObjectType = 'RT::System')) AND 
(ACL_3.PrincipalId = CachedGroupMembers_4.GroupId) AND 
(ACL_3.PrincipalType = 'Group') AND (ACL_3.RightName = 'OwnTicket' OR 
ACL_3.RightName = 'SuperUser') AND (CachedGroupMembers_2.Disabled = '0') 
AND (CachedGroupMembers_2.GroupId = '4') AND 
(CachedGroupMembers_4.Disabled = '0') AND (Principals_1.Disabled = '0') 
AND (Principals_1.PrincipalType = 'User') AND (Principals_1.id != '1')  
ORDER BY main.Name ASC;
+----+-------------+----------------------+--------+----------------------------------------------------+---------------------+---------+---------------------------------------+------+-----------------------------------------------------------+
| id | select_type | table                | type   | 
possible_keys                                      | key                 
| key_len | ref                                   | rows | 
Extra                                                     |
+----+-------------+----------------------+--------+----------------------------------------------------+---------------------+---------+---------------------------------------+------+-----------------------------------------------------------+
|  1 | SIMPLE      | CachedGroupMembers_2 | range  | 
DisGrouMem,CachedGroupMembers3,cachedgroupmembers1 | DisGrouMem          
| 10      | NULL                                  |  264 | Using where; 
Using index; Using temporary; Using filesort |
|  1 | SIMPLE      | main                 | eq_ref | 
PRIMARY                                            | PRIMARY             
| 4       | rt4_2_1.CachedGroupMembers_2.MemberId |    1 
|                                                           |
|  1 | SIMPLE      | Principals_1         | eq_ref | 
PRIMARY                                            | PRIMARY             
| 4       | rt4_2_1.main.id                       |    1 | Using where; 
Distinct                                     |
|  1 | SIMPLE      | CachedGroupMembers_4 | ref    | 
DisGrouMem,CachedGroupMembers3,cachedgroupmembers1 | CachedGroupMembers3 
| 5       | rt4_2_1.CachedGroupMembers_2.MemberId |    1 | Using where; 
Distinct                                     |
|  1 | SIMPLE      | ACL_3                | range  | 
ACL1                                               | ACL1                
| 85      | NULL                                  |   13 | Using where; 
Using index; Distinct                        |
+----+-------------+----------------------+--------+----------------------------------------------------+---------------------+---------+---------------------------------------+------+-----------------------------------------------------------+
5 rows in set (0.01 sec)

mysql> EXPLAIN SELECT DISTINCT main.* FROM Users main CROSS JOIN ACL 
ACL_3 JOIN Principals Principals_1  ON ( Principals_1.id = main.id ) 
JOIN CachedGroupMembers CachedGroupMembers_2  ON ( 
CachedGroupMembers_2.MemberId = Principals_1.id ) JOIN 
CachedGroupMembers CachedGroupMembers_4  ON ( 
CachedGroupMembers_4.MemberId = Principals_1.id )  WHERE 
((ACL_3.ObjectType = 'RT::Ticket' AND ACL_3.ObjectId   = 35402) OR 
(ACL_3.ObjectType = 'RT::Queue' AND ACL_3.ObjectId   = 3) OR 
(ACL_3.ObjectType = 'RT::System') OR (ACL_3.ObjectType = 'RT::Ticket' 
AND ACL_3.ObjectId   = 35402) OR (ACL_3.ObjectType = 'RT::Queue' AND 
ACL_3.ObjectId   = 3) OR (ACL_3.ObjectType = 'RT::System')) AND 
(ACL_3.PrincipalId = CachedGroupMembers_4.GroupId) AND 
(ACL_3.PrincipalType = 'Group') AND (ACL_3.RightName = 'OwnTicket' OR 
ACL_3.RightName = 'SuperUser') AND (CachedGroupMembers_2.Disabled = '0') 
AND (CachedGroupMembers_2.GroupId = '4') AND 
(CachedGroupMembers_4.Disabled = '0') AND (Principals_1.Disabled = '0') 
AND (Principals_1.PrincipalType = 'User') AND (Principals_1.id != '1')  
ORDER BY main.Name ASC;
+----+-------------+----------------------+--------+----------------------------------------------------+---------------------+---------+---------------------------------------+------+-----------------------------------------------------------+
| id | select_type | table                | type   | 
possible_keys                                      | key                 
| key_len | ref                                   | rows | 
Extra                                                     |
+----+-------------+----------------------+--------+----------------------------------------------------+---------------------+---------+---------------------------------------+------+-----------------------------------------------------------+
|  1 | SIMPLE      | CachedGroupMembers_2 | range  | 
DisGrouMem,CachedGroupMembers3,cachedgroupmembers1 | DisGrouMem          
| 10      | NULL                                  |  264 | Using where; 
Using index; Using temporary; Using filesort |
|  1 | SIMPLE      | main                 | eq_ref | 
PRIMARY                                            | PRIMARY             
| 4       | rt4_2_1.CachedGroupMembers_2.MemberId |    1 
|                                                           |
|  1 | SIMPLE      | Principals_1         | eq_ref | 
PRIMARY                                            | PRIMARY             
| 4       | rt4_2_1.main.id                       |    1 | Using where; 
Distinct                                     |
|  1 | SIMPLE      | CachedGroupMembers_4 | ref    | 
DisGrouMem,CachedGroupMembers3,cachedgroupmembers1 | CachedGroupMembers3 
| 5       | rt4_2_1.CachedGroupMembers_2.MemberId |    1 | Using where; 
Distinct                                     |
|  1 | SIMPLE      | ACL_3                | range  | 
ACL1                                               | ACL1                
| 85      | NULL                                  |   15 | Using where; 
Using index; Distinct                        |
+----+-------------+----------------------+--------+----------------------------------------------------+---------------------+---------+---------------------------------------+------+-----------------------------------------------------------+
5 rows in set (0.00 sec)

> Since your list is short (5 rows sent) rather than 500, you're
> unlikely to have the common error someone else was pointing you at
> where you grant OwnTicket too widely.  RT 4.2 also has a workaround
> for this case.
>
> Do you grant your OwnTicket rights out to groups per queue, roles per
> queue.  Do you assign lots of Ticket level use groups (adminccs/ccs,
> etc) which then pick up OwnTicket?
We have our users who can own tickets in groups and then assign those 
groups to the queue and give them OwnTicket. We have at max 3 groups per 
queue. We don't assign permissions on any role. We also have some 
individuals added but those are there so that managers only watch the 
tickets but can't own them.

Thanks!
//adam