Re: Does blank lines in sql monitor report (text type) indicate that those operations are not called

  • From: Andy Sayer <andysayer@xxxxxxxxx>
  • To: Krish Singh <krishsingh.111@xxxxxxxxx>
  • Date: Wed, 15 Jan 2020 20:46:43 +0000

Lines 11-18 were not executed at all. This would have been due to the
filter operation on line 4. If you check the execution plan with
dbms_xplan.display_cursor then you will get the predicates section
(something that SQL Live Monitor reports are lacking), you should see what
it says about line 4 for clues.

Hope that helps,
Andrew

On Wed, 15 Jan 2020 at 20:01, kunwar singh <krishsingh.111@xxxxxxxxx> wrote:

Hi Listers,

I have one quick question.  Does the blank column values mean those
operations are not called and do they mean 0 records returned.

SQL Text
------------------------------
select /*+ monitor */ count(9) from dba_objects

Global Information
------------------------------
 Status              :  DONE (ALL ROWS)
 Instance ID         :  1
 Session             :  KUNWAR (102:53661)
 SQL ID              :  74f93u44y6nmg
 SQL Execution ID    :  16777217
 Execution Started   :  01/15/2020 07:13:50
 First Refresh Time  :  01/15/2020 07:13:50
 Last Refresh Time   :  01/15/2020 07:13:50
 Duration            :  .042713s
 Module/Action       :  SQL*Plus/-
 Service             :  SYS$USERS
 Program             :  sqlplus@***
 Fetch Calls         :  1

Global Stats
=================================================
| Elapsed |   Cpu   |  Other   | Fetch | Buffer |
| Time(s) | Time(s) | Waits(s) | Calls |  Gets  |
=================================================
|    0.04 |    0.04 |     0.00 |     1 |   4085 |
=================================================

SQL Plan Monitoring Details (Plan Hash Value=1203538133)

====================================================================================================================================================
| Id |         Operation          |       Name       |  Rows   | Cost |
Time    | Start  | Execs |   Rows   |  Mem  | Activity | Activity Detail |
|    |                            |                  | (Estim) |      |
Active(s) | Active |       | (Actual) | (Max) |   (%)    |   (# samples)   |

====================================================================================================================================================
|  0 | SELECT STATEMENT           |                  |         |      |
      1 |     +0 |     1 |        1 |       |          |                 |
|  1 |   SORT AGGREGATE           |                  |       1 |      |
      1 |     +0 |     1 |        1 |       |          |                 |
|  2 |    VIEW                    | DBA_OBJECTS      |   89023 | 3031 |
      1 |     +0 |     1 |    91210 |       |          |                 |
|  3 |     UNION-ALL              |                  |         |      |
      1 |     +0 |     1 |    91210 |       |          |                 |
|  4 |      FILTER                |                  |         |      |
      1 |     +0 |     1 |    91210 |       |          |                 |
|  5 |       HASH JOIN            |                  |   89326 |  392 |
      1 |     +0 |     1 |    91210 |    2M |          |                 |
|  6 |        INDEX FULL SCAN     | I_USER2          |     125 |    1 |
      1 |     +0 |     1 |      125 |       |          |                 |
|  7 |        HASH JOIN           |                  |   89326 |  391 |
      1 |     +0 |     1 |    91210 |    2M |          |                 |
|  8 |         INDEX FULL SCAN    | I_USER2          |     125 |    1 |
      1 |     +0 |     1 |      125 |       |          |                 |
|  9 |         TABLE ACCESS FULL  | OBJ$             |   89326 |  389 |
      1 |     +0 |     1 |    91210 |       |          |                 |
| 10 |       TABLE ACCESS FULL    | USER_EDITIONING$ |       1 |    2 |
      1 |     +0 |   885 |        1 |       |          |                 |
| 11 |       NESTED LOOPS SEMI    |                  |       1 |    2 |
        |        |       |          |       |          |                 |
               <<<<<<< See no entries for Rows(Actual) and other columns
for id 11-18
| 12 |        INDEX SKIP SCAN     | I_USER2          |       1 |    1 |
        |        |       |          |       |          |                 |
| 13 |        INDEX RANGE SCAN    | I_OBJ4           |       1 |    1 |
        |        |       |          |       |          |                 |
| 14 |       TABLE ACCESS FULL    | USER_EDITIONING$ |       1 |    2 |
        |        |       |          |       |          |                 |
| 15 |      NESTED LOOPS          |                  |       1 |      |
        |        |     1 |          |       |          |                 |
| 16 |       INDEX FULL SCAN      | I_LINK1          |       1 |      |
        |        |     1 |          |       |          |                 |
| 17 |       TABLE ACCESS CLUSTER | USER$            |       1 |      |
        |        |       |          |       |          |                 |
| 18 |        INDEX UNIQUE SCAN   | I_USER#          |       1 |      |
        |        |       |          |       |          |                 |

====================================================================================================================================================




--
Cheers,
Kunwar

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