Purpose of scheduler$ query.

Question

Hi,
I noticed that the following query is being captured in my AWR.Can anyone please tell me what is this query for??
select decode(bitand(a.flags, 16384), 0, a.next_run_date, a.last_enabled_time), a.obj#, decode(bitand(a.flags, 16384), 0, 0, 1), a.sch_job from (select p.obj# obj#, p.flags flags, p.next_run_date next_run_date, p.job_status job_status, p.class_oid class_oid, p.last_enabled_time last_enabled_time, p.instance_id instance_id, 1 sch_job from sys.scheduler$_job p UNION ALL select q.obj#, q.flags, q.next_run_date, q.job_status, q.class_oid, q.last_enabled_time, q.instance_id, 1 from sys.scheduler$_lightweight_job q UNION ALL select j.job, 0, from_tz(cast(j.next_date as timestamp), to_char(systimestamp, 'TZH:TZM')), 1, NULL, from_tz(cast(j.next_date as timestamp), to_char(systimestamp, 'TZH:TZM')), NULL, 0 from sys.job$ j where (:1 = 1) and (j.field1 is null or j.field1 = 0) and j.job not in (select v.id2 from v$lock v where v.type = 'JQ')) a where bitand(a.job_status, 3) = 1 and ((bitand(a.flags, 134217728 + 268435456) = 0) or (bitand(a.job_status, 1024) <> 0)) and bitand(a.flags, 4096) = 0 and a.instance_id is NULL and (a.class_oid is null or (a.class_oid is not null and a.class_oid in (select b.obj# from sys.scheduler$_class b where b.affinity is null))) and decode(bitand(a.flags, 16384), 0, a.next_run_date, a.last_enabled_time) = (select min(decode(bitand(c.flags, 16384), 0, c.next_run_date, c.last_enabled_time)) from (select r.flags flags, r.next_run_date next_run_date, r.job_status job_status, r.class_oid class_oid, r.last_enabled_time last_enabled_time, r.instance_id instance_id from sys.scheduler$_job r UNION ALL select s.flags, s.next_run_date, s.job_status, s.class_oid, s.last_enabled_time, s.instance_id from sys.scheduler$_lightweight_job s UNION ALL select 0, from_tz(cast(k.next_date as timestamp), to_char(systimestamp, 'TZH:TZM')), 1, NULL, from_tz(cast(k.next_date as timestamp), to_char(systimestamp, 'TZH:TZM')), NULL from sys.job$ k where (:2 = 1) and (k.field1 is null or k.field1 = 0) and k.job not in (select w.id2 from v$lock w where w.type = 'JQ')) c where bitand(c.job_status, 3) = 1 and ((bitand(c.flags, 134217728 + 268435456) = 0) or (bitand(c.job_status, 1024) <> 0)) and bitand(c.flags, 4096) = 0 and c.instance_id is NULL and (c.class_oid is null or (c.class_oid is not null and c.class_oid in (select d.obj# from sys.scheduler$_class d where d.affinity is null))))

Answer 1

The query looks to be recursive SQL fired for job executions. The issue could be related to Bug 9008161. I would advise logging a SR with Oracle support.