Hi,
i have a query which uses index range scan in one environment and the same query does index skip scan in another environment.
oracle db version 10.2.0.3
Elapsed: 00:00:11.89
Execution Plan
----------------------------------------------------------
Plan hash value: 1271961902
--------------------------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
--------------------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 1 | 100 | 49 (0)| 00:00:01 |
|* 1 | TABLE ACCESS BY INDEX ROWID| AP_BSTRN_HEADER | 1 | 100 | 49 (0)| 00:00:01 |
|* 2 | INDEX RANGE SCAN | II_AP_BSTRN_HEADER | 47 | | 4 (0)| 00:00:01 |
--------------------------------------------------------------------------------------------------
Statistics
----------------------------------------------------------
8 recursive calls
0 db block gets
8578 consistent gets
8372 physical reads
0 redo size
517 bytes sent via SQL*Net to client
488 bytes received via SQL*Net from client
2 SQL*Net roundtrips to/from client
0 sorts (memory)
0 sorts (disk)
1 rows processed
Elapsed: 00:00:00.12
Execution Plan
----------------------------------------------------------
Plan hash value: 499858110
-------------------------------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
-------------------------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 1 | 100 | 8 (0)| 00:00:01 |
|* 1 | TABLE ACCESS BY INDEX ROWID| AP_BSTRN_HEADER | 1 | 100 | 8 (0)| 00:00:01 |
|* 2 | INDEX SKIP SCAN | AP_BSTRN_HEAD_BK_CK_IDX | 3 | | 6 (0)| 00:00:01 |
-------------------------------------------------------------------------------------------------------
Statistics
----------------------------------------------------------
8 recursive calls
0 db block gets
28 consistent gets
4 physical reads
0 redo size
517 bytes sent via SQL*Net to client
492 bytes received via SQL*Net from client
2 SQL*Net roundtrips to/from client
0 sorts (memory)
0 sorts (disk)
1 rows processed