Execute a statement select twice in one sitting, what is happening in the PGA?

Hi guys,.

Oracle 10g.
I was just asked while executing a select twice in one sitting, what is happening in the PGA?
I know that oracle does not need to analyze this statement because of the LMS "library cache", and perhaps not necessary to perform the work of IO because BMG "cache db pads" oracle, but is the first fetch result set cached in the PGA, so that it could be directly returned to the user without doing anything to the LMS?
I'm not familiar with the details of the structure of the memory in Oracle, that contain exactly PGA?

Thank you very much!

The results would be extracted once again, not cached. By default.

However, in 11g, you can try using the CLIENT_RESULT_CACHE (which should work with a sqlplus Oracle client).
See http://download.oracle.com/docs/cd/E11882_01/server.112/e16638/memory.htm#PFGRF961

Hemant K Collette

Tags: Database

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the launch of evil a statement select twice

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This is my problem: when I run this query, the first time, it returns 2 records, if I launch the second time, it will not return any records.
I tried to remove the group from and SUM (NVL) and functions of application normally.

select  SUM (NVL (a.burdened_cost, 0)) AS amount ,c.track_as_labor_flag,a.start_date, a.end_date
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Published by: BluShadow on July 27, 2011 13:52
addition of {noformat}

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You have will mark a pagesize and linesize expansion in SQL * MORE to avoid all the text wrapping. However, I formatted the plans for you; You can see the difference between the two.

First of all:


-------------------------------------------------------------------------------------------------------------------------------------------------------
| Id  | Operation                          | Name                        | Start
PLAN_TABLE_OUTPUT
--------------------------------------------------------------------------------
s | E-Rows | A-Rows |   A-Time   | Buffers |  OMem |  1Mem | Used-Mem |
-------------------------------------------------------------------------------------------------------------------------------------------------------
|   0 | SELECT STATEMENT                   |                             |      1 |        |      2 |00:00:00.01 |     139 |       |       |          |
|   1 |  HASH GROUP BY                     |                             |      1 |      1 |      2 |00:00:00.01 |     139 |   862K|   862K|  476K (0)|
|*  2 |   HASH JOIN                        |                             |      1 |      1 |      2 |00:00:00.01 |     139 |   947K|   947K|  645K (0)|
|   3 |    NESTED LOOPS OUTER              |                             |      1 |      1 |      3 |00:00:00.01 |     124 |       |       |          |
|   4 |     NESTED LOOPS                   |                             |      1 |      1 |      3 |00:00:00.01 |     124 |       |       |          |
|   5 |      NESTED LOOPS                  |                             |      1 |      1 |      3 |00:00:00.01 |     117 |       |       |          |
|   6 |       NESTED LOOPS                 |                             |      1 |      1 |      3 |00:00:00.01 |     112 |       |       |          |
|   7 |        NESTED LOOPS OUTER          |                             |      1 |      1 |     51 |00:00:00.01 |      30 |       |       |          |
|*  8 |         TABLE ACCESS BY INDEX ROWID| PA_RESOURCE_ASSIGNMENTS     |      1 |      1 |     51 |00:00:00.01 |      16 |       |       |          |
|*  9 |          INDEX RANGE SCAN          | PA_RESOURCE_ASSIGNMENTS_N2  |      1 |      6 |     51 |00:00:00.01 |       2 |       |       |          |
|* 10 |         INDEX UNIQUE SCAN          | FND_LOOKUP_VALUES_U1        |     51 |      1 |      0 |00:00:00.01 |      14 |       |       |          |
|* 11 |        TABLE ACCESS BY INDEX ROWID | PA_BUDGET_VERSIONS          |     51 |      1 |      3 |00:00:00.01 |      82 |       |       |          |
|* 12 |         INDEX UNIQUE SCAN          | PA_BUDGET_VERSIONS_U1       |     51 |      1 |     51 |00:00:00.01 |      31 |       |       |          |
|* 13 |       TABLE ACCESS BY INDEX ROWID  | PA_RESOURCE_LIST_MEMBERS    |      3 |      1 |      3 |00:00:00.01 |       5 |       |       |          |
|* 14 |        INDEX UNIQUE SCAN           | PA_RESOURCE_LIST_MEMBERS_U1 |      3 |      1 |      3 |00:00:00.01 |       2 |       |       |          |
|  15 |      TABLE ACCESS BY INDEX ROWID   | PA_BUDGET_LINES             |      3 |      1 |      3 |00:00:00.01 |       7 |       |       |          |
|* 16 |       INDEX RANGE SCAN             | PA_BUDGET_LINES_N2          |      3 |      1 |      3 |00:00:00.01 |       5 |       |       |          |
|* 17 |     INDEX UNIQUE SCAN              | FND_LOOKUP_VALUES_U1        |      3 |      1 |      0 |00:00:00.01 |       0 |       |       |          |
|* 18 |    TABLE ACCESS FULL               | PA_RESOURCE_LIST_MEMBERS    |      1 |    121 |     60 |00:00:00.01 |      15 |       |       |          |
--------------------------------------------------------------------------------
PLAN_TABLE_OUTPUT
--------------------------------------------------------------------------------
-----------------------------------------------------------------------
Predicate Information (identified by operation id):
---------------------------------------------------
   2 - access("C"."RESOURCE_ID"="M"."RESOURCE_ID")
   8 - filter("A"."PROJECT_ID"=1879)
   9 - access("A"."TASK_ID"=211004)
  10 - access("LOOKUP_TYPE"='UNIT' AND "VIEW_APPLICATION_ID"=275 AND "A"."UNIT_O
F_MEASURE"="LOOKUP_CODE" AND "SECURITY_GROUP_ID"=0 AND
              "LANGUAGE"=USERENV('LANG'))
  11 - filter(("B"."BUDGET_STATUS_CODE"='B' AND "B"."CURRENT_FLAG"='Y' AND "B"."BUDGET_TYPE_CODE"='AC'))
  12 - access("A"."BUDGET_VERSION_ID"="B"."BUDGET_VERSION_ID")
  13 - filter(NVL("M"."MIGRATION_CODE",'-99')'N')
  14 - access("A"."RESOURCE_LIST_MEMBER_ID"="M"."RESOURCE_LIST_MEMBER_ID")
  16 - access("I"."RESOURCE_ASSIGNMENT_ID"="A"."RESOURCE_ASSIGNMENT_ID")
  17 - access("LOOKUP_TYPE"='BUDGET CHANGE REASON' AND "VIEW_APPLICATION_ID"=275 AND "I"."CHANGE_REASON_CODE"="LOOKUP_CODE" AND
              "SECURITY_GROUP_ID"=0 AND "LANGUAGE"=USERENV('LANG'))
  18 - filter("C"."TRACK_AS_LABOR_FLAG"='Y')

Second:

------------------------------------------------------------------------
| Id  | Operation                            | Name                       | Starts | E-Rows | A-Rows |   A-Time   | Buffers |  OMem |  1Mem | Used-Mem |
--------------------------------------------------------------------------------------------------------------------------------------------------------
|   0 | SELECT STATEMENT                     |                            |     1 |        |      0 |00:00:00.01 |       3 |       |       |          |
|   1 |  HASH GROUP BY                       |                            |     1 |      1 |      0 |00:00:00.01 |       3 |   757K|   757K|          |
|   2 |   NESTED LOOPS OUTER                 |                            |     1 |      1 |      0 |00:00:00.01 |       3 |       |       |          |
|   3 |    NESTED LOOPS                      |                            |     1 |      1 |      0 |00:00:00.01 |       3 |       |       |          |
|   4 |     VIEW                             | VW_GBF_17                  |     1 |      1 |      0 |00:00:00.01 |       3 |       |       |          |
|   5 |      HASH GROUP BY                   |                            |     1 |      1 |      0 |00:00:00.01 |       3 |   759K|   759K|          |
|   6 |       NESTED LOOPS                   |                            |     1 |        |      0 |00:00:00.01 |       3 |       |       |          |
|   7 |        NESTED LOOPS                  |                            |     1 |      3 |      0 |00:00:00.01 |       3 |       |       |          |
|*  8 |         HASH JOIN                    |                            |     1 |      3 |      0 |00:00:00.01 |       3 |   775K|   775K|  193K (0)|
|*  9 |          HASH JOIN                   |                            |     1 |      7 |      0 |00:00:00.01 |       3 |   821K|   821K|  193K (0)|
|  10 |           MERGE JOIN CARTESIAN       |                            |     1 |     92 |      0 |00:00:00.01 |       3 |       |       |          |
|* 11 |            INDEX RANGE SCAN          | FND_LOOKUP_VALUES_U1       |     1 |      1 |      0 |00:00:00.01 |       3 |       |       |          |
|  12 |            BUFFER SORT               |                            |     0 |    237 |      0 |00:00:00.01 |       0 | 73728 | 73728 |          |
|* 13 |             TABLE ACCESS FULL        | PA_RESOURCE_LIST_MEMBERS   |     0 |    237 |      0 |00:00:00.01 |       0 |       |       |          |
|* 14 |           TABLE ACCESS BY INDEX ROWID| PA_RESOURCE_ASSIGNMENTS    |     0 |     51 |      0 |00:00:00.01 |       0 |       |       |          |
|* 15 |            INDEX RANGE SCAN          | PA_RESOURCE_ASSIGNMENTS_N2 |     0 |     51 |      0 |00:00:00.01 |       0 |       |       |          |
|* 16 |          TABLE ACCESS FULL           | PA_RESOURCE_LIST_MEMBERS   |     0 |     60 |      0 |00:00:00.01 |       0 |       |       |          |
|* 17 |         INDEX UNIQUE SCAN            | PA_BUDGET_VERSIONS_U1      |     0 |      1 |      0 |00:00:00.01 |       0 |       |       |          |
|* 18 |        TABLE ACCESS BY INDEX ROWID   | PA_BUDGET_VERSIONS         |     0 |      1 |      0 |00:00:00.01 |       0 |       |       |          |
|  19 |     TABLE ACCESS BY INDEX ROWID      | PA_BUDGET_LINES            |     0 |      1 |      0 |00:00:00.01 |       0 |       |       |          |
|* 20 |      INDEX RANGE SCAN                | PA_BUDGET_LINES_N2         |     0 |      1 |      0 |00:00:00.01 |       0 |       |       |          |
|* 21 |    INDEX UNIQUE SCAN                 | FND_LOOKUP_VALUES_U1       |     0 |      1 |      0 |00:00:00.01 |       0 |       |       |          |
--------------------------------------------------------------------------------
------------------------------------------------------------------------
Predicate Information (identified by operation id):
---------------------------------------------------
   8 - access("C"."RESOURCE_ID"="M"."RESOURCE_ID")
   9 - access("A"."UNIT_OF_MEASURE"="LOOKUP_CODE" AND "A"."RESOURCE_LIST_MEMBER_
ID"="M"."RESOURCE_LIST_MEMBER_ID")
  11 - access("LOOKUP_TYPE"='UNIT' AND "VIEW_APPLICATION_ID"=275 AND "SECURITY_GROUP_ID"=0 AND "LANGUAGE"=USERENV('LANG'))
PLAN_TABLE_OUTPUT
--------------------------------------------------------------------------------
       filter(("LANGUAGE"=USERENV('LANG') AND "SECURITY_GROUP_ID"=0))
  13 - filter(NVL("M"."MIGRATION_CODE",'-99')'N')
  14 - filter(("A"."PROJECT_ID"=1879 AND "A"."UNIT_OF_MEASURE" IS NOT NULL))
  15 - access("A"."TASK_ID"=211004)
  16 - filter("C"."TRACK_AS_LABOR_FLAG"='Y')
  17 - access("A"."BUDGET_VERSION_ID"="B"."BUDGET_VERSION_ID")
  18 - filter(("B"."BUDGET_STATUS_CODE"='B' AND "B"."BUDGET_TYPE_CODE"='AC' AND
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  20 - access("I"."RESOURCE_ASSIGNMENT_ID"="ITEM_2")
  21 - access("LOOKUP_TYPE"='BUDGET CHANGE REASON' AND "VIEW_APPLICATION_ID"=275
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-----
   - cardinality feedback used for this statement

Notice the "cardinality feedback" text used for this statement at the end of the second plan. Feedback the cardinality is a feature of the optimizer introduced in Oracle 11.2; This means that Oracle can dynamically change the execution plan by using the results of previous performances (usually for the better).

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Execute a statement select twice in one sitting, what is happening in the PGA?

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