Re: Unnesting Subqueries in an Outline
- From: Luke Davies <luke.davies@xxxxxxxxxxx>
- To: oracle-l@xxxxxxxxxxxxx
- Date: Thu, 23 Aug 2007 12:55:28 +0100
Here are the traces
First the one without the hint
Execution Plan
----------------------------------------------------------
0 SELECT STATEMENT Optimizer=CHOOSE (Cost=160281 Card=11 Bytes=737)
1 0 FILTER
2 1 SORT (GROUP BY) (Cost=160281 Card=11 Bytes=737)
3 2 TABLE ACCESS (BY INDEX ROWID) OF 'FUND_PRICES (Cost=1
Card=61 Bytes=1220)
4 3 NESTED LOOPS (Cost=66 Card=7463438 Bytes=500050346)
5 4 NESTED LOOPS (Cost=65 Card=121440 Bytes=5707680)
6 5 TABLE ACCESS (FULL) OF 'FUNDS' (Cost=3 Card=247
Bytes=4940)
7 5 TABLE ACCESS (BY INDEX ROWID) OF 'FUND_PRICES'
(Cost=1 Card=492 Bytes=13284)
8 7 INDEX (RANGE SCAN) OF 'FP_F_FK_I' (NON-UNIQUE)
9 4 INDEX (RANGE SCAN) OF 'FP_F_FK_I' (NON-UNIQUE)
Then the one with the NO_UNNEST hint
Execution Plan
----------------------------------------------------------
0 SELECT STATEMENT Optimizer=CHOOSE (Cost=65 Card=1 Bytes=33)
1 0 NESTED LOOPS (Cost=65 Card=1 Bytes=33)
2 1 TABLE ACCESS (FULL) OF 'FUNDS' (Cost=3 Card=247 Bytes=3211)
3 1 TABLE ACCESS (BY INDEX ROWID) OF 'FUND_PRICES' (Cost=1
Card=1 Bytes=20)
4 3 INDEX (UNIQUE SCAN) OF 'FP_PK' (UNIQUE)
5 4 SORT (AGGREGATE)
6 5 TABLE ACCESS (BY INDEX ROWID) OF 'FUND_PRICES'
(Cost=1 Card=61 Bytes=1220)
7 6 INDEX (RANGE SCAN) OF 'FP_F_FK_I' (NON-UNIQUE)
(Cost=1 Card=1475)
Cheers
Luke
Alvaro Jose Fernandez wrote:
Luke,
Please, put an or AUTOTRACE traceonly EXPLAIN ) plan, with and without
NO_UNNEST, just to check.
regards,
alvaro.
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