[rt-users] Strange, long running MySQL Query under RT 3.6.5 / MySQL 5.0.67 / Apache 2.2.3 /FastCGI

[Ham MI-ID, Torsten Brumm]

Hi RT Users and MySQL Gurus,
since some days i have several times the day many queries like this:

Id: 1174494 User: rt_user Host: 10.61.2.98:59549 Db: rt3 Time: 190
Command: Query State: Copying to tmp table

SELECT DISTINCT main.*
  FROM Users main CROSS JOIN ACL ACL_4 JOIN Principals Principals_1 ON (Principals_1.id = main.id) JOIN CachedGroupMembers CachedGroupMembers_2 ON
     (CachedGroupMembers_2.MemberId = Principals_1.id) JOIN Groups Groups_3 ON (Groups_3.id = CachedGroupMembers_2.GroupId)
  WHERE (Principals_1.Disabled = '0') AND (ACL_4.PrincipalType = Groups_3.Type) AND (Principals_1.id != '1') AND (Principals_1.PrincipalType = 'User') AND
     (ACL_4.RightName = 'OwnTicket') AND ((ACL_4.ObjectType = 'RT::Queue') OR (ACL_4.ObjectType = 'RT::System')) AND ((Groups_3.Domain = 'RT::Queue-Role') OR
     (Groups_3.Domain = 'RT::System-Role'))
  ORDER BY main.Name ASC

table       |type    |possible_keys       |key         | ken_len|ref     |  rows|
1           |SIMPLE  |Groups_3            |range       |PRIMARY,|Groups1 |    67|Using where; Using index; Using temporary; Using filesort
1           |SIMPLE  |CachedGroupMembers_2|ref         |DisGrouM|DisGrouM|     5|Using where; Using index
1           |SIMPLE  |main                |eq_ref      |PRIMARY,|PRIMARY |     4|
1           |SIMPLE  |ACL_4               |range       |    ACL1|ACL1    |    54|Using where; Using index; Distinct
1           |SIMPLE  |Principals_1        |eq_ref      | PRIMARY|PRIMARY |     4|Using where; Distinct

At this moment i can't figure out why this query is running, who is starting this and how to fix this. All this Queries running around 200sec.

Any ideas where to start?

Thanks

Torsten

Kuehne + Nagel (AG & Co.) KG, Geschaeftsleitung: Hans-Georg Brinkmann (Vors.), Uwe Bielang (Stellv.), Bruno Mang, Dirk Blesius (Stellv.), Alfred Manke, Christian Marnetté (Stellv.),  Mark Reinhardt (Stellv.), Jens Wollesen, Rainer Wunn, Sitz: Bremen, Registergericht: Bremen, HRA 21928, USt-IdNr.: DE 812773878, Persoenlich haftende Gesellschaft: Kuehne & Nagel A.G., Sitz: Contern/Luxemburg Geschaeftsfuehrender Verwaltungsrat: Klaus-Michael Kuehne