Why the monstrous SORT?
- From: "Allen, Brandon" <Brandon.Allen@xxxxxxxxxxx>
- To: <oracle-l@xxxxxxxxxxxxx>
- Date: Wed, 6 Jul 2005 16:29:49 -0700
Hi,
I've got an application query that is taking hours to run. After tracing and
running tkprof, I see the execution plan below. Yes, it's a monster of a
query, but Oracle seems to handle it pretty well except for the huge amount of
rows being returned by the SORT (GROUP BY) step. How can it possibly have to
sort so many rows (1.1 Billion!), when it is only getting 237,018 rows from the
previous NESTED LOOP step? Any idea how to prevent or minimize this sort?
Thanks!
Brandon
Rows Execution Plan
------- ---------------------------------------------------
0 SELECT STATEMENT GOAL: CHOOSE
11 MINUS
14 SORT (UNIQUE)
14 FILTER
285 SORT (GROUP BY)
4768 NESTED LOOPS (OUTER)
4769 NESTED LOOPS (OUTER)
4769 NESTED LOOPS
4769 NESTED LOOPS
285 HASH JOIN
197 VIEW OF 'AR_SALESPERSON_CODE'
197 SORT (UNIQUE)
197 SORT (GROUP BY)
197 HASH JOIN
212 TABLE ACCESS GOAL: ANALYZED (FULL) OF 'CT_TEAM_MEMBER'
5637 TABLE ACCESS GOAL: ANALYZED (FULL) OF 'CT_ADD_NAMES'
284 NESTED LOOPS
2 MERGE JOIN (CARTESIAN)
2 TABLE ACCESS GOAL: ANALYZED (BY INDEX ROWID) OF
'AR_CUSTOMER_MASTER'
2 INDEX GOAL: ANALYZED (RANGE SCAN) OF
'AR_CUSTOMER_MASTER_PK' (UNIQUE)
2 SORT (JOIN)
1 TABLE ACCESS GOAL: ANALYZED (FULL) OF 'OE_CONTROL'
284 TABLE ACCESS GOAL: ANALYZED (BY INDEX ROWID) OF 'OE_HDR'
285 INDEX GOAL: ANALYZED (RANGE SCAN) OF 'OE_HDR_2'
(NON-UNIQUE)
5052 TABLE ACCESS GOAL: ANALYZED (BY INDEX ROWID) OF 'OE_LINE'
5052 INDEX GOAL: ANALYZED (RANGE SCAN) OF 'OE_LINE_PK' (UNIQUE)
9536 TABLE ACCESS GOAL: ANALYZED (BY INDEX ROWID) OF
'OE_SUB_ENTITY'
9536 INDEX GOAL: ANALYZED (UNIQUE SCAN) OF
'HM_OE_SUB_ENTITY_UK1' (UNIQUE)
4768 TABLE ACCESS GOAL: ANALYZED (BY INDEX ROWID) OF
'HM_INVOICE_SUB_ENTITY_CONTROL'
9536 INDEX GOAL: ANALYZED (UNIQUE SCAN) OF
'HM_INVOICE_SE_CONTROL_PK' (UNIQUE)
4334 VIEW
1127322080 SORT (GROUP BY)
237018 NESTED LOOPS
2 TABLE ACCESS GOAL: ANALYZED (FULL) OF 'OE_CONTROL'
237018 TABLE ACCESS GOAL: ANALYZED (FULL) OF 'AR_DOC_LINE'
3 SORT (UNIQUE)
3 FILTER
4 SORT (GROUP BY)
8 NESTED LOOPS (OUTER)
9 NESTED LOOPS (OUTER)
9 NESTED LOOPS
9 NESTED LOOPS
4 HASH JOIN
3 NESTED LOOPS
2 MERGE JOIN (CARTESIAN)
2 TABLE ACCESS GOAL: ANALYZED (BY INDEX ROWID) OF
'AR_CUSTOMER_MASTER'
2 INDEX GOAL: ANALYZED (RANGE SCAN) OF
'AR_CUSTOMER_MASTER_PK' (UNIQUE)
2 SORT (JOIN)
1 TABLE ACCESS GOAL: ANALYZED (FULL) OF 'OE_CONTROL'
3 TABLE ACCESS GOAL: ANALYZED (BY INDEX ROWID) OF 'OE_HDR'
285 INDEX GOAL: ANALYZED (RANGE SCAN) OF 'OE_HDR_2'
(NON-UNIQUE)
197 VIEW OF 'AR_SALESPERSON_CODE'
197 SORT (UNIQUE)
197 SORT (GROUP BY)
197 HASH JOIN
212 TABLE ACCESS GOAL: ANALYZED (FULL) OF 'CT_TEAM_MEMBER'
5637 TABLE ACCESS GOAL: ANALYZED (FULL) OF 'CT_ADD_NAMES'
11 TABLE ACCESS GOAL: ANALYZED (BY INDEX ROWID)
OF 'OE_LINE'
11 INDEX GOAL: ANALYZED (RANGE SCAN) OF 'OE_LINE_PK' (UNIQUE)
16 TABLE ACCESS GOAL: ANALYZED (BY INDEX ROWID) OF
'OE_SUB_ENTITY'
16 INDEX GOAL: ANALYZED (UNIQUE SCAN) OF
'HM_OE_SUB_ENTITY_UK1' (UNIQUE)
8 TABLE ACCESS GOAL: ANALYZED (BY INDEX ROWID) OF
'HM_INVOICE_SUB_ENTITY_CONTROL'
16 INDEX GOAL: ANALYZED (UNIQUE SCAN) OF
'HM_INVOICE_SE_CONTROL_PK' (UNIQUE)
0 VIEW
1891480 SORT (GROUP BY)
237018 NESTED LOOPS
2 TABLE ACCESS GOAL: ANALYZED (FULL) OF 'OE_CONTROL'
237018 TABLE ACCESS GOAL: ANALYZED (FULL) OF 'AR_DOC_LINE'
********************************************************************************
Privileged/Confidential Information may be contained in this message or
attachments hereto. Please advise immediately if you or your employer do not
consent to Internet email for messages of this kind. Opinions, conclusions and
other information in this message that do not relate to the official business
of this company shall be understood as neither given nor endorsed by it.
--
//www.freelists.org/webpage/oracle-l
Other related posts:
