100% Cpu on One of our portal system

Hi All,
We are facing problem in one of our portal system where the cpu usage is going upto 100%. We have checked trace and other things but seems to be fine.
At database level following query is taking all the cpu. We are not sure what exactly it is
"SELECT
  DISTINCT "V"."OBJECTID"
FROM
  "DAV_CONTENTSTORE" "CS" INNER JOIN "DAV_RESOURCE" "R" ON "R"."CONTENTS
  TOREID" = "CS"."CONTENTSTOREID" INNER JOIN "PVC_VERSION" "V" ON "V"."V
  ERSIONID" = "R"."RESOURCEID" INNER JOIN "PVC_VERSIONSET" "VS" ON "VS".
  "EXTERNALPROPERTY" = :1 AND "VS"."EXTERNALTYPE" = :2 INNER JOIN "PVC_V
  SETELEMENT" "VSE" ON "VS"."VERSIONSETID" = "VSE"."VERSIONSETID" INNER
  JOIN "PVC_VERSIONEDOBJ" "VO" ON "VSE"."OBJECTID" = "VO"."OBJECTID"
WHERE
  "CS"."ISINDELTA" = :3 AND "CS"."DELTAALGORITHM" = :4 AND
  "R"."RESOURCETYPE" = :5 AND "R"."PATHURI" LIKE :6 AND "R"."OBJNAME" >=
  :7 AND "R"."OBJNAME" < :8 AND "VO"."OBJECTTYPE" = :9 AND
  "V"."VERSIONID" = "VSE"."VERSIONID" AND "V"."OBJECTID" > :10
ORDER BY
The above is cpu intensive query and at os level we can see it is taking 100% cpu.
Can somebody help us to understand what is this query doing and how we can stop it occuring in the system.
Regards
Deepak

wilberfan wrote:
Dual-core, 32-bit Intel machine.   Did an -Syu two nights ago.  A dozen or so packages upgraded--including (I remember) the latest nvidia (302.17-1).
When I first boot-up, I get 100% CPU on one of the cores.   htop reveals that it's the X session that's running away (?)   Rebooting seems to take care of it--although I don't understand why yet...
Anyone experiencing this--or have any suggestions on what I could look at to see what the problem might be? 
Thanks in advance...
I had this problem with mount. In fact asking the system for shutdown would set a live lock on a mount process taking one core.

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