Performance Tuning - Self Join Issue

Question

Hi,
The following query takes long time to execute. Is there any better way to
re-writing the query to reduce the time it takes to execute.
INSERT INTO TT_TEMP_MAINGUI_SP_PERCENT_MOV
(prev_prc_dt,asset_id,pricing_pt_id,price_dt)
SELECT max(tpm2.prc_dt),
tpm2.asset_id ,
tpm2.pricing_pt_id ,
tpm1.prc_dt
FROM t_prc_master tpm1,
t_prc_master tpm2
WHERE tpm1.prc_dt = '19-Dec-07'
AND tpm1.asset_id = tpm2.asset_id
AND tpm1.pricing_pt_id = tpm2.pricing_pt_id
AND tpm2.prc_dt < tpm1.prc_dt
AND tpm2.accept_flg = 'Y'
AND tpm1.accept_flg = 'Y'
AND EXISTS (SELECT 1 FROM t_temp_prcmov
WHERE pca_flg = 'P'
AND tpm1.pricing_pt_id = prc_pt_cntry_atyp)
GROUP BY tpm2.asset_id, tpm2.pricing_pt_id,tpm1.prc_dt;
select count(*) from t_prc_master
where prc_dt = '19-Dec-07'
COUNT(*)
784161
-- Here is the TKPROF Output
INSERT INTO TT_TEMP_MAINGUI_SP_PERCENT_MOV
(prev_prc_dt,asset_id,pricing_pt_id,price_dt)
SELECT max(tpm2.prc_dt),
tpm2.asset_id ,
tpm2.pricing_pt_id ,
tpm1.prc_dt
FROM t_prc_master tpm1,
t_prc_master tpm2
WHERE tpm1.prc_dt = '19-Dec-07'
AND tpm1.asset_id = tpm2.asset_id
AND tpm1.pricing_pt_id = tpm2.pricing_pt_id
AND tpm2.prc_dt < tpm1.prc_dt
AND tpm2.accept_flg = 'Y'
AND tpm1.accept_flg = 'Y'
AND EXISTS (SELECT 1 FROM t_temp_prcmov
WHERE pca_flg = 'P'
AND tpm1.pricing_pt_id = prc_pt_cntry_atyp)
GROUP BY tpm2.asset_id, tpm2.pricing_pt_id,tpm1.prc_dt
call count cpu elapsed disk query current rows
Parse 1 0.00 0.00 0 0 0 0
Execute 1 226.01 317.50 1980173 4915655 805927 780544
Fetch 0 0.00 0.00 0 0 0 0
total 2 226.01 317.51 1980173 4915655 805927 780544
Misses in library cache during parse: 1
Optimizer goal: CHOOSE
Parsing user id: 98 (PRSDBO)
Rows Row Source Operation
780544 SORT GROUP BY (cr=4915236 r=1980165 w=0 time=312751120 us)
40416453 NESTED LOOPS (cr=4915236 r=1980165 w=0 time=245408132 us)
783459 NESTED LOOPS (cr=956325 r=92781 w=0 time=17974163 us)
55 TABLE ACCESS FULL T_TEMP_PRCMOV (cr=3 r=0 w=0 time=406 us)
783459 TABLE ACCESS BY INDEX ROWID T_PRC_MASTER (cr=956322 r=92781 w=0 time=17782856 us)
784161 INDEX RANGE SCAN PRC_DT_ASSET_ID (cr=412062 r=69776 w=0 time=14136725 us)(object id 450059)
40416453 INDEX RANGE SCAN ASSET_DT_ACCEPT_FLG (cr=3958911 r=1887384 w=0 time=217215303 us)(object id 450055)
Rows Execution Plan
0 INSERT STATEMENT GOAL: CHOOSE
780544 SORT (GROUP BY)
40416453 NESTED LOOPS
783459 NESTED LOOPS
55 TABLE ACCESS GOAL: ANALYZED (FULL) OF 'T_TEMP_PRCMOV'
783459 TABLE ACCESS GOAL: ANALYZED (BY INDEX ROWID) OF
'T_PRC_MASTER'
784161 INDEX GOAL: ANALYZED (RANGE SCAN) OF 'PRC_DT_ASSET_ID'
(NON-UNIQUE)
40416453 INDEX GOAL: ANALYZED (RANGE SCAN) OF 'ASSET_DT_ACCEPT_FLG'
(UNIQUE)
Could somebody help me in resolving the issue? It would be appreciated...

Answer 1

Well, it's a bit of a mess to read. Please use the pre or code tags enclosed in [] next time to preserve the formatting of the code.
First thing that looks 'bad' to me is
WHERE tpm1.prc_dt = '19-Dec-07'which should be (i assume you want 2007 and not 1907)
WHERE tpm1.prc_dt = TO_DATE('19-Dec-2007', 'DD-MON-YYYY');The next thing i'm very confused with is...why are you self joining the table? You should be able to just do this.....logically, it should produce the same results, though it's obviously not tested :D)
SELECT
   max(tpm2.prc_dt),
   tpm2.asset_id ,
   tpm2.pricing_pt_id ,
   TO_DATE('19-Dec-2007', 'DD-MON-YYYY')  AS prc_dt
FROM t_prc_master tpm2
WHERE tpm2.prc_dt < TO_DATE('19-Dec-2007', 'DD-MON-YYYY')
AND   tpm2.accept_flg = 'Y'
AND   EXISTS   ( 
                  SELECT
                     NULL
                  FROM t_prc_master tpm1
                  WHERE tpm1.prc_dt          = TO_DATE('19-Dec-2007', 'DD-MON-YYYY')
                  AND   tpm1.asset_id        = tpm2.asset_id
                  AND   tpm1.pricing_pt_id   = tpm2.pricing_pt_id
                  AND   tpm1.accept_flg      = 'Y'                 
                  AND   tpm1.pricing_pt_id  IN (SELECT tmov.prc_pt_cntry_atyp FROM t_temp_prcmov tmov WHERE tmov.pca_flg = 'P')
GROUP BY tpm2.asset_id, tpm2.pricing_pt_id, TO_DATE('19-Dec-2007', 'DD-MON-YYYY');Message was edited by:
Tubby