SQL Performance (MOSC)

MOSC Banner

Cost (%CPU) computation in the explain

edited Dec 5, 2013 2:06AM in SQL Performance (MOSC) 1 commentAnswered
Hi

   How the cost and %CPU calculated in the explain plan.  In the below example the query is returning 1 row but the %CPU is showing 100%. 

   Request to explain the basis of %CPU computation

 ------------------------------------------------------------------------------------------------
| Id  | Operation                   | Name             | Rows  | Bytes | Cost (%CPU)| Time     |
------------------------------------------------------------------------------------------------
|   0 | SELECT STATEMENT            |                  |       |       |     2 (100)|          |
|*  1 |  TABLE ACCESS BY INDEX ROWID| XXXX             |     1 |   303 |     2   (0) | 00:00:01 |
|*  2 |   INDEX UNIQUE SCAN         | XXXX_idx         |     1 |       |     1   (0) |  00:00:01|
------------------------------------------------------------------------------------------------

Regards

Bhanu Pratap M

Howdy, Stranger!

Log In

To view full details, sign in to My Oracle Support Community.

Register

Don't have a My Oracle Support Community account? Click here to get started.

Category Leaderboard

Top contributors this month

Instructions for posting

×

1. Select a discussion category from the picklist.


2. Enter a title that clearly identifies the subject of your question.


3. In the body, insert detailed information, including Oracle product and version.


Please abide by the Oracle Community guidelines and refrain from posting any customer or personally identifiable information (PI/CI).


Cloud / Fusion customers - Our Cloud community has moved! Please go to Cloud Customer Connect .


New to My Oracle Support Community? Visit our Welcome Center

MOSC Help Center