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Poor performance while selecting or deleting from DR$WAITING

Poor performance while selecting or deleting from DR$WAITING

2005-03-01       - By Naveen

Reply:     1     2  

I pasted incomplete TKRPOFed output in my previous
email. Here is the complete output:

DELETE FROM DR$WAITING
WHERE
WTG_CID = :b1  AND WTG_PID = :b2  AND EXISTS  (SELECT
1   FROM DR$PENDING
 WHERE DR$PENDING.PND_CID = DR$WAITING.WTG_CID  AND
DR$PENDING.PND_PID =
 DR$WAITING.WTG_PID  AND DR$PENDING.PND_ROWID =
DR$WAITING.WTG_ROWID )


call     count       cpu    elapsed       disk    
query    current        rows
-- ---- -- ---  -- ----- -- ---- -- -- ---- --
-- ---- -- -- ---- --  -- ---- --
Parse        0      0.00       0.00          0        
0          0           0
Execute      4     14.85      14.54      47720    
80454          0           0
Fetch        0      0.00       0.00          0        
0          0           0
-- ---- -- ---  -- ----- -- ---- -- -- ---- --
-- ---- -- -- ---- --  -- ---- --
total        4     14.85      14.54      47720    
80454          0           0

Misses in library cache during parse: 0
Optimizer goal: CHOOSE
Parsing user id: 29     (recursive depth: 2)

Elapsed times include waiting on following events:
 Event waited on                             Times  
Max. Wait  Total Waited
 -- ---- ---- ---- ---- ---- ---- ---- --   Waited
-- ---- --  -- ---- ----
 db file sequential read                      2013  
   0.00          0.08
 db file scattered read                       7838  
   0.00          1.06
********************************************************************************

.
.
SELECT WTG_ROWID,ROWID
FROM
DR$WAITING  WHERE WTG_CID = :b1  AND WTG_PID = :b2


call     count       cpu    elapsed       disk    
query    current        rows
-- ---- -- ---  -- ----- -- ---- -- -- ---- --
-- ---- -- -- ---- --  -- ---- --
Parse        0      0.00       0.00          0        
0          0           0
Execute      4      0.00       0.00          0        
0          0           0
Fetch        4     29.71      29.23      85752    
118639          0           0
-- ---- -- ---  -- ----- -- ---- -- -- ---- --
-- ---- -- -- ---- --  -- ---- --
total        8     29.71      29.24      85752    
118639          0           0

Misses in library cache during parse: 0
Optimizer goal: CHOOSE
Parsing user id: 29  (CTXSYS)   (recursive depth: 2)
error during execute of EXPLAIN PLAN statement
ORA-00942 (See ORA-00942.ora-code.com): table or view does not exist

parse error offset: 101

Elapsed times include waiting on following events:
 Event waited on                             Times  
Max. Wait  Total Waited
 -- ---- ---- ---- ---- ---- ---- ---- --   Waited
-- ---- --  -- ---- ----
 db file sequential read                      4837  
   0.00          0.19
 db file scattered read                      17903  
   0.00          2.05


   
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