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TABLE ACCESS BY INDEX ROWID more cost

edited Jul 26, 2011 5:15AM in Using the My Oracle Support Portal (MOSC) 6 commentsAnswered

Hi

Can you help me how to reduce the cost of  TABLE ACCESS BY INDEX ROWID more cost & why table access by index rowid is more expensive than full table scan

-------------------------------------------------------------------------------------
| Id  | Operation                      | Name               | Rows  | Bytes | Cost  |
-------------------------------------------------------------------------------------
|   0 | SELECT STATEMENT               |                    |  5088 |   223K| 38163 |
|   1 |  TABLE ACCESS BY INDEX ROWID   | GETS_DWH     |  5088 |   223K|   680 |
|   2 |   INDEX RANGE SCAN             | GETS_DWH_TBK |  5088 |       |    37 |
|   3 |    COUNT STOPKEY               |                    |       |       |       |
|   4 |     TABLE ACCESS BY INDEX ROWID| GETS_DWH     |     2 |    82 | 37483 |
|   5 |      INDEX RANGE SCAN          | GETS_DWH_PST |   502K|       |     3 |
-------------------------------------------------------------------------------------

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