sql explain plan issue

From: Sai Selvaganesan <ssaisundar_at_sbcglobal.net>
Date: Wed, 4 Feb 2004 11:13:38 -0800 (PST)
Message-ID: <20040204191338.28389.qmail@web80407.mail.yahoo.com>

hi
the below is a sql code and explain plan on two environments the first one is 81.7.3 and the next one is 9i. can someone please point out why there is a diff

SELECT SQ1_T2.ORG_ID
FROM S_PARTY SQ1_T1, S_ORG_BU SQ1_T2, S_ORG_EXT SQ1_T3 WHERE
(SQ1_T3.INT_ORG_FLG = 'Y') AND
(SQ1_T1.ROW_ID = SQ1_T3.PAR_ROW_ID AND SQ1_T2.BU_ID = SQ1_T1.ROW_ID) AND
(SQ1_T3.PAR_BU_ID = '0-R9NH')
Execution Plan

---

0 SELECT STATEMENT Optimizer=RULE
1 0 NESTED LOOPS
2 1 NESTED LOOPS
3 2 TABLE ACCESS (BY INDEX ROWID) OF 'S_ORG_EXT' 4 3 INDEX (RANGE SCAN) OF 'S_ORG_EXT_F13' (NON-UNIQUE) 5 2 INDEX (UNIQUE SCAN) OF 'S_PARTY_P1' (UNIQUE) 6 1 TABLE ACCESS (BY INDEX ROWID) OF 'S_ORG_BU' 7 6 INDEX (RANGE SCAN) OF 'S_ORG_BU_M4' (NON-UNIQUE) Execution Plan

---

0 SELECT STATEMENT Optimizer=RULE
1 0 TABLE ACCESS (BY INDEX ROWID) OF 'S_ORG_BU' 2 1 NESTED LOOPS
3 2 NESTED LOOPS
4 3 TABLE ACCESS (BY INDEX ROWID) OF 'S_ORG_EXT'

5 4 INDEX (RANGE SCAN) OF 'S_ORG_EXT_F13' (NON-UNIQUE) 
6 3 INDEX (UNIQUE SCAN) OF 'S_PARTY_P1' (UNIQUE) 
7 2 INDEX (RANGE SCAN) OF 'S_ORG_BU_M4' (NON-UNIQUE)
 

the objects are the same but the plan is different. this is a third party software, hence rule based.  

thanks
sai

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Received on Wed Feb 04 2004 - 13:13:38 CST