vs 10g 11g: VO bind variable values stale on jbo.ampool.doampooling = false

Hi gang

(JDev 11g Build 5188)

I'm currently such tests recommended by the merger of 11g Guide to test the management of State ADF BC with jbo.ampool.doampooling = false (see paragraphs 36 and 37). I see different behaviors under 11 g vs 10 g.

I have a single VO updateable with a query that is limited by a single binding variable. I have a JSF page with the link as command inputText variable, executeWithParams one operating control commandButton, and a table showing the results of the VO.

Less than 10g, I can:

(1) open the page
(2) enter a value (say X) to the variable binding, click the executeWithParams button and correctly to see results in the table corresponding to the value of the bind variable X.
(3) enter a different value for the binding variable (say Y), click on the executeWithParams button and correctly to see results in the table corresponding to the value of the value of the bind variable Y.

Less than 11g I get different behaviors for # 3. Instead when I press the button executeWithParams with the value defined on, the table always show results for the previous value of the variable X bind?

It should be noted that if I set jbo.ampool.doampooling = true, the problem goes away, but probably the error reappears in a system of production under load, so I need to find what is happening here.

Maybe I see a bug, but given the large amount of changes 11 g and large amount of documents that I read on the management of the State, it could just be that I missed something vital to 11 g.

Does anyone have any opinions, what is happening here?

Thank you for your help in advance.

CM.

Thanks Chris - I took possession of the SR.

Kind regards

Didier.

Tags: Java

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SQL_ID  c7su63uw7nch6, child number 0
-------------------------------------
SELECT /*+ GATHER_PLAN_STATISTICS */   C1,   C2 FROM   T1 WHERE   C2 =
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Plan hash value: 236868917

------------------------------------------------------------------------------------------------------------
| Id  | Operation                   | Name      | Starts | E-Rows | A-Rows |   A-Time   | Buffers | Reads  |
------------------------------------------------------------------------------------------------------------
|   0 | SELECT STATEMENT            |           |      1 |        |      0 |00:00:00.01 |       3 |      1 |
|   1 |  TABLE ACCESS BY INDEX ROWID| T1        |      1 |   5957 |      0 |00:00:00.01 |       3 |      1 |
|*  2 |   INDEX RANGE SCAN          | IND_T1_C2 |      1 |   5957 |      0 |00:00:00.01 |       3 |      1 |
------------------------------------------------------------------------------------------------------------

Predicate Information (identified by operation id):
---------------------------------------------------
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SQL_ID  c7su63uw7nch6, child number 0
-------------------------------------
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Plan hash value: 236868917

---------------------------------------------------------------------------------------------------
| Id  | Operation                   | Name      | Starts | E-Rows | A-Rows |   A-Time   | Buffers |
---------------------------------------------------------------------------------------------------
|   0 | SELECT STATEMENT            |           |      1 |        |  10000 |00:00:00.02 |    1783 |
|   1 |  TABLE ACCESS BY INDEX ROWID| T1        |      1 |   5957 |  10000 |00:00:00.02 |    1783 |
|*  2 |   INDEX RANGE SCAN          | IND_T1_C2 |      1 |   5957 |  10000 |00:00:00.01 |     690 |
---------------------------------------------------------------------------------------------------

Predicate Information (identified by operation id):
---------------------------------------------------
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---------------------------------------------------
          1  recursive calls
          1  db block gets
     108571  consistent gets
          0  physical reads
         96  redo size
   21958348  bytes sent via SQL*Net to client
     726508  bytes received via SQL*Net from client
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Plan hash value: 236868917

---------------------------------------------------------------------------------------------------
| Id  | Operation                   | Name      | Starts | E-Rows | A-Rows |   A-Time   | Buffers |
---------------------------------------------------------------------------------------------------
|   0 | SELECT STATEMENT            |           |      1 |        |  10000 |00:00:00.02 |    1783 |
|   1 |  TABLE ACCESS BY INDEX ROWID| T1        |      1 |   5957 |  10000 |00:00:00.02 |    1783 |
|*  2 |   INDEX RANGE SCAN          | IND_T1_C2 |      1 |   5957 |  10000 |00:00:00.01 |     690 |
---------------------------------------------------------------------------------------------------

Predicate Information (identified by operation id):
---------------------------------------------------
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SELECT * FROM TABLE(DBMS_XPLAN.DISPLAY_CURSOR('c7su63uw7nch6',1,'ALLSTATS LAST'));

SQL_ID  c7su63uw7nch6, child number 1
-------------------------------------
SELECT /*+ GATHER_PLAN_STATISTICS */   C1,   C2 FROM   T1 WHERE   C2 =
:N1

Plan hash value: 3617692013

------------------------------------------------------------------------------------
| Id  | Operation         | Name | Starts | E-Rows | A-Rows |   A-Time   | Buffers |
------------------------------------------------------------------------------------
|   0 | SELECT STATEMENT  |      |      1 |        |    990K|00:00:00.83 |     108K|
|*  1 |  TABLE ACCESS FULL| T1   |      1 |    988K|    990K|00:00:00.83 |     108K|
------------------------------------------------------------------------------------

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---------------------------------------------------
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EXEC :N1:=2

SELECT /*+ GATHER_PLAN_STATISTICS */
  C1,
  C2
FROM
  T1
WHERE
  C2 = :N1;

no rows selected

Elapsed: 00:00:00.00

SELECT * FROM TABLE(DBMS_XPLAN.DISPLAY_CURSOR(NULL,NULL,'ALLSTATS LAST'));

SQL_ID  c7su63uw7nch6, child number 2
-------------------------------------
SELECT /*+ GATHER_PLAN_STATISTICS */   C1,   C2 FROM   T1 WHERE   C2 =
:N1

Plan hash value: 236868917

---------------------------------------------------------------------------------------------------
| Id  | Operation                   | Name      | Starts | E-Rows | A-Rows |   A-Time   | Buffers |
---------------------------------------------------------------------------------------------------
|   0 | SELECT STATEMENT            |           |      1 |        |      0 |00:00:00.01 |       3 |
|   1 |  TABLE ACCESS BY INDEX ROWID| T1        |      1 |   5957 |      0 |00:00:00.01 |       3 |
|*  2 |   INDEX RANGE SCAN          | IND_T1_C2 |      1 |   5957 |      0 |00:00:00.01 |       3 |
---------------------------------------------------------------------------------------------------

Predicate Information (identified by operation id):
---------------------------------------------------
   2 - access("C2"=:N1)

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    EXEC :N1:=99
SET TIMING ON

SELECT /*+ GATHER_PLAN_STATISTICS */
  C1,
  C2
FROM
  T1
WHERE
  C2 = :N1;

10000 rows selected.

Elapsed: 00:00:05.31

SELECT * FROM TABLE(DBMS_XPLAN.DISPLAY_CURSOR(NULL,NULL,'ALLSTATS LAST'));

SQL_ID  c7su63uw7nch6, child number 2
-------------------------------------
SELECT /*+ GATHER_PLAN_STATISTICS */   C1,   C2 FROM   T1 WHERE   C2 =
:N1

Plan hash value: 236868917

---------------------------------------------------------------------------------------------------
| Id  | Operation                   | Name      | Starts | E-Rows | A-Rows |   A-Time   | Buffers |
---------------------------------------------------------------------------------------------------
|   0 | SELECT STATEMENT            |           |      1 |        |  10000 |00:00:00.02 |    1783 |
|   1 |  TABLE ACCESS BY INDEX ROWID| T1        |      1 |   5957 |  10000 |00:00:00.02 |    1783 |
|*  2 |   INDEX RANGE SCAN          | IND_T1_C2 |      1 |   5957 |  10000 |00:00:00.01 |     690 |
---------------------------------------------------------------------------------------------------

Predicate Information (identified by operation id):
---------------------------------------------------
   2 - access("C2"=:N1)

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SET AUTOTRACE TRACEONLY STATISTICS

SELECT /*+ GATHER_PLAN_STATISTICS */
  C1,
  C2
FROM
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WHERE
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990000 rows selected.

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Statistics
---------------------------------------------------
          0  recursive calls
          0  db block gets
     175927  consistent gets
          0  physical reads
          0  redo size
   21958348  bytes sent via SQL*Net to client
     726508  bytes received via SQL*Net from client
      66001  SQL*Net roundtrips to/from client
          0  sorts (memory)
          0  sorts (disk)
     990000  rows processed

SET AUTOTRACE OFF

SELECT * FROM TABLE(DBMS_XPLAN.DISPLAY_CURSOR('c7su63uw7nch6',2,'ALLSTATS LAST'));

SQL_ID  c7su63uw7nch6, child number 2
-------------------------------------
SELECT /*+ GATHER_PLAN_STATISTICS */   C1,   C2 FROM   T1 WHERE   C2 =
:N1

Plan hash value: 236868917

---------------------------------------------------------------------------------------------------
| Id  | Operation                   | Name      | Starts | E-Rows | A-Rows |   A-Time   | Buffers |
---------------------------------------------------------------------------------------------------
|   0 | SELECT STATEMENT            |           |      1 |        |    990K|00:00:01.63 |     175K|
|   1 |  TABLE ACCESS BY INDEX ROWID| T1        |      1 |   5957 |    990K|00:00:01.63 |     175K|
|*  2 |   INDEX RANGE SCAN          | IND_T1_C2 |      1 |   5957 |    990K|00:00:00.68 |   67932 |
---------------------------------------------------------------------------------------------------

Predicate Information (identified by operation id):
---------------------------------------------------
   2 - access("C2"=:N1)

    The foregoing is the execution plan for CHILD_NUMBER 2 - notice that this time he reports 990 000 recovered lines, it's the execution that was used - adaptive cursor sharing plan do not have take effect and force the re-evaluation of the implementation plan - implementation plan has NOT been changed for a full table scan. That's the risk you take if you allow histograms on columns that have an uneven distribution of values and bind variables are used in the WHERE clause that refers to the column.

    Charles Hooper
    Co-author of "Expert Oracle practices: Oracle Database Administration of the Oak Table.
    http://hoopercharles.WordPress.com/
    IT Manager/Oracle DBA
    K & M-making Machine, Inc.

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