Steve, I doubt if the AWR snapshot can do anything about it, but I’d have to walk through the snapshot SQL to check.

Thanks for this analysis. Your comment about the read consistency of v$ views got me to thinking. As you noted, some of these are very complex structures. Does the AWR snapshot provided in 10G take care of this? In other words, it may not pragmatically make a difference, but if the snapshot procedure selects from v$sql, and then later from v$sql_plan, the contents of the two views and their links may not correspond.

As I noted, it probably isn’t an issue, but I wondered if Oracle accounts for this somehow?

Thanks,

Steve

Possible display error – I think your query hints are in the incorrect format.

Best regards.

mathew butler

WITH locks_temp AS
(SELECT /*+ MATERIALIZE */
*
FROM dba_locks)
, lock_holders1 AS
(
SELECT /*+ MATERIALIZE */
w.session_id waiting_session
, h.session_id holding_session
, w.lock_type lock_type
, h.mode_held mode_held
, w.mode_requested mode_requested
, w.lock_id1 lock_id1
, w.lock_id2 lock_id2
FROM locks_temp w
, locks_temp h
WHERE h.blocking_others = ‘Blocking’
AND h.mode_held != ‘None’
AND h.mode_held != ‘Null’
AND w.mode_requested != ‘None’
AND w.lock_type = h.lock_type
AND w.lock_id1 = h.lock_id1
AND w.lock_id2 = h.lock_id2)
, lock_holders2 AS
(
SELECT /*+ MATERIALIZE */
holding_session waiting_session
, 0 holding_session
, ‘None’ lock_type
, ” mode_held
, ” mode_requested
, ” lock_id1
, ” lock_id2
FROM lock_holders1
MINUS
SELECT waiting_session
, 0 waiting_session
, ‘None’ lock_type
, ” mode_held
, ” mode_requested
, ” lock_id1
, ” lock_id2
FROM lock_holders1)
, lock_holders_all AS
(SELECT *
FROM lock_holders1
UNION ALL
SELECT *
FROM lock_holders2)
SELECT RPAD (‘ ‘, 3 * (LEVEL – 2), ‘ ‘)|| decode(level,1,”,’|–’) || l.waiting_session sid
, l.lock_type
, s.username username
, s.machine machine
, s.osuser osuser
, NVL (s.module, s.program) program
, ‘alter system kill session ‘||””||s.sid||’,'||s.serial#||””||’;’ kill
FROM lock_holders_all l
, v$session s
WHERE s.SID = l.waiting_session
CONNECT BY PRIOR l.waiting_session = l.holding_session
START WITH l.holding_session = 0
ORDER SIBLINGS by s.sid