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RE: bitmapped indexes, partition elimination, perform!!!

From: <Paula_Stankus_at_doh.state.fl.us>
Date: Wed, 07 Aug 2002 14:16:26 -0800
Message-ID: <F001.004AE23B.20020807141626@fatcity.com>


Help - weird performance problem!!!




| Operation | Name | Rows | Bytes| Cost | Pstart|
Pstop |


| SELECT STATEMENT | | 1 | 5 | 9331 | |
|
| SORT AGGREGATE | | 1 | 5 | | |
|
| SORT AGGREGATE | | 1 | 5 | | |
|
| INLIST ITERATOR | | | | | |
|
| PARTITION RANGE ITERAT| | | | |KEY(I)
|KEY(I) |
| BITMAP CONVERSION COU| | | | | |
|
| BITMAP INDEX RANGE S|NDX_MVYRS | | | |KEY(I)
|KEY(I) |
Cost higher but less than a second.

Ignore the cost higher cost was sign. Faster!!!!!Does Key(*) mean it is doing part. Elimin. I think so but can you see the inlist?

Very fast with all years involved. Then added predicate:

select
/*+ INDEX(mv_birthstat,ndx_mvyrstatecoage) */ count(*) from mv_birthstat
where cert_chld_brth_year in('1995','1996','1997','1998','1999')

   and brth_MTHR_res_STATE_CODE = '10';

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  INET: Paula_Stankus_at_doh.state.fl.us

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Received on Wed Aug 07 2002 - 17:16:26 CDT

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