Bad performance on a table partitioned range when you use sysdate

I have a partition table with a DATE partition key column.
Tables servs as a sliding window this is by adding a new partiotion for each day and dropping out of the older partitions.
Each week, I generate a weekly report:
SELECT... FROM MaTable WHERE part-key-column > SYSDATE-7;
This query runs for about 5 hours

When you use a hardcoded hard 'day' the query is finished about 4 times faster
SELECT... FROM MaTable WHERE part-key-column > TO_DATE ('20100211', 'YYYYMMDD');

any suggestion?

Qry Plans:

First Qry (poor):
SQL> explain plan for SELECT * FROM dwh_net1.net_na_messw  WHERE dwh_net1.net_na_messw.mdate > trunc(SYSDATE - 7);

EXPLAIN PLAN ausgeführt.

SQL> select * from table(dbms_xplan.display);

PLAN_TABLE_OUTPUT                                                                                                                                                                                                                                              
---------------------------------------------------------------------------------------------------------
Plan hash value: 1311981634                                                                                                                                                                                                                                    
                                                                                                                                                                                                                                                               
---------------------------------------------------------------------------------------------------------                                                                                                                                                      
| Id  | Operation                | Name         | Rows  | Bytes | Cost (%CPU)| Time     | Pstart| Pstop |                                                                                                                                                      
---------------------------------------------------------------------------------------------------------                                                                                                                                                      
|   0 | SELECT STATEMENT         |              |  8479K|  3000M|  1975K (10)| 06:35:11 |       |       |                                                                                                                                                      
|   1 |  PARTITION RANGE ITERATOR|              |  8479K|  3000M|  1975K (10)| 06:35:11 |   KEY |    61 |                                                                                                                                                      
|*  2 |   TABLE ACCESS FULL      | NET_NA_MESSW |  8479K|  3000M|  1975K (10)| 06:35:11 |   KEY |    61 |                                                                                                                                                      
---------------------------------------------------------------------------------------------------------                                                                                                                                                      
                                                                                                                                                                                                                                                               
Predicate Information (identified by operation id):                                                                                                                                                                                                            

PLAN_TABLE_OUTPUT                                                                                                                                                                                                                                              
---------------------------------------------------------------------------------------------------------                                                                                                                                                                                                            
                                                                                                                                                                                                                                                               
   2 - filter("NET_NA_MESSW"."MDATE">TRUNC(SYSDATE@!-7))                                                                                                                                                                                                       
Second (hardcoded, faster) Qry:
SQL> explain plan for SELECT * FROM dwh_net1.net_na_messw  WHERE MDATE > to_date('12.02.2010','DD.MM.YYYY');

EXPLAIN PLAN ausgeführt.

SQL> select * from table(dbms_xplan.display);

PLAN_TABLE_OUTPUT                                                                                                                                                                                                                                              
---------------------------------------------------------------------------------------------------------
Plan hash value: 1311981634                                                                                                                                                                                                                                    
                                                                                                                                                                                                                                                               
---------------------------------------------------------------------------------------------------------                                                                                                                                                      
| Id  | Operation                | Name         | Rows  | Bytes | Cost (%CPU)| Time     | Pstart| Pstop |                                                                                                                                                      
---------------------------------------------------------------------------------------------------------                                                                                                                                                      
|   0 | SELECT STATEMENT         |              |  8479K|  3000M|   227K (10)| 00:45:30 |       |       |                                                                                                                                                      
|   1 |  PARTITION RANGE ITERATOR|              |  8479K|  3000M|   227K (10)| 00:45:30 |    54 |    61 |                                                                                                                                                      
|*  2 |   TABLE ACCESS FULL      | NET_NA_MESSW |  8479K|  3000M|   227K (10)| 00:45:30 |    54 |    61 |                                                                                                                                                      
---------------------------------------------------------------------------------------------------------                                                                                                                                                      
                                                                                                                                                                                                                                                               
Predicate Information (identified by operation id):                                                                                                                                                                                                            

PLAN_TABLE_OUTPUT                                                                                                                                                                                                                                              
---------------------------------------------------------------------------------------------------------
                                                                                                                                                                                                                                                               
   2 - filter("MDATE">TO_DATE('2010-02-12 00:00:00', 'yyyy-mm-dd hh24:mi:ss'))                                                                                                                                                                                 
                                                                                                                                                                                                                                                               
Published by: user10396457 on February 19, 2010 12:27

Your two says plans are exactly the same. Are you sure that the elapsed time are different. Can you please set autotrace to traceonly and run two statements and send the output.

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