NPL of multiple execution for the awr sql_id

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• Plans of multiple executions for the same SQL statement

  Dear experts,
  
  awrsqrpt. SQL shows several plans for a single SQL statement executions. How is it possible that a single SQL statement will be several Plans of executions within the AWR report.
  
  Here is the output of the awrsqrpt for your reference.
  
  

  WORKLOAD REPOSITORY SQL Report
  
  Snapshot Period Summary
  
  DB Name         DB Id    Instance     Inst Num Release     RAC Host
  ------------ ----------- ------------ -------- ----------- --- ------------
  TESTDB          2157605839 TESTDB1               1 10.2.0.3.0  YES testhost1
  
                Snap Id      Snap Time      Sessions Curs/Sess
              --------- ------------------- -------- ---------
  Begin Snap:     32541 11-Oct-08 21:00:13       248     141.1
    End Snap:     32542 11-Oct-08 21:15:06       245     143.4
     Elapsed:               14.88 (mins)
     DB Time:               12.18 (mins)
  
  SQL Summary                            DB/Inst: TESTDB/TESTDB1  Snaps: 32541-32542
  
                  Elapsed
     SQL Id      Time (ms)
  ------------- ----------
  51szt7b736bmg     25,131
  Module: SQL*Plus
  UPDATE TEST SET TEST_TRN_DAY_CL = (SELECT (NVL(ACCT_CR_BAL,0) + NVL(ACCT_DR_BAL,
  0)) FROM ACCT WHERE ACCT_TRN_DT = (:B1 ) AND TEST_ACC_NB = ACCT_ACC_NB(+)) WHERE
   TEST_BATCH_DT = (:B1 )
  
            -------------------------------------------------------------
  
  SQL ID: 51szt7b736bmg                  DB/Inst: TESTDB/TESTDB1  Snaps: 32541-32542
  -> 1st Capture and Last Capture Snap IDs
     refer to Snapshot IDs witin the snapshot range
  -> UPDATE TEST SET TEST_TRN_DAY_CL = (SELECT (NVL(ACCT_CR_BAL,0) + NVL(AC...
  
      Plan Hash           Total Elapsed                 1st Capture   Last Capture
  #   Value                    Time(ms)    Executions       Snap ID        Snap ID
  --- ---------------- ---------------- ------------- ------------- --------------
  1   2960830398                 25,131             1         32542          32542
  2   3834848140                      0             0         32542          32542
            -------------------------------------------------------------
  
  
  Plan 1(PHV: 2960830398)
  -----------------------
  
  Plan Statistics                        DB/Inst: TESTDB/TESTDB1  Snaps: 32541-32542
  -> % Total DB Time is the Elapsed Time of the SQL statement divided
     into the Total Database Time multiplied by 100
  
  Stat Name                                Statement   Per Execution % Snap
  ---------------------------------------- ---------- -------------- -------
  Elapsed Time (ms)                            25,131       25,130.7     3.4
  CPU Time (ms)                                23,270       23,270.2     3.9
  Executions                                        1            N/A     N/A
  Buffer Gets                               2,626,166    2,626,166.0    14.6
  Disk Reads                                      305          305.0     0.3
  Parse Calls                                       1            1.0     0.0
  Rows                                        371,735      371,735.0     N/A
  User I/O Wait Time (ms)                         564            N/A     N/A
  Cluster Wait Time (ms)                            0            N/A     N/A
  Application Wait Time (ms)                        0            N/A     N/A
  Concurrency Wait Time (ms)                        0            N/A     N/A
  Invalidations                                     0            N/A     N/A
  Version Count                                     2            N/A     N/A
  Sharable Mem(KB)                                 26            N/A     N/A
            -------------------------------------------------------------
  
  Execution Plan
  ------------------------------------------------------------------------------------------------
  | Id  | Operation                    | Name            | Rows  | Bytes | Cost (%CPU)| Time     |
  ------------------------------------------------------------------------------------------------
  |   0 | UPDATE STATEMENT             |                 |       |       |  1110 (100)|          |
  |   1 |  UPDATE                      | TEST            |       |       |            |          |
  |   2 |   TABLE ACCESS FULL          | TEST            |   116K|  2740K|  1110   (2)| 00:00:14 |
  |   3 |   TABLE ACCESS BY INDEX ROWID| ACCT            |     1 |    26 |     5   (0)| 00:00:01 |
  |   4 |    INDEX RANGE SCAN          | ACCT_DT_ACC_IDX |     1 |       |     4   (0)| 00:00:01 |
  ------------------------------------------------------------------------------------------------
  
  
  
  
  Plan 2(PHV: 3834848140)
  -----------------------
  
  Plan Statistics                        DB/Inst: TESTDB/TESTDB1  Snaps: 32541-32542
  -> % Total DB Time is the Elapsed Time of the SQL statement divided
     into the Total Database Time multiplied by 100
  
  Stat Name                                Statement   Per Execution % Snap
  ---------------------------------------- ---------- -------------- -------
  Elapsed Time (ms)                                 0            N/A     0.0
  CPU Time (ms)                                     0            N/A     0.0
  Executions                                        0            N/A     N/A
  Buffer Gets                                       0            N/A     0.0
  Disk Reads                                        0            N/A     0.0
  Parse Calls                                       0            N/A     0.0
  Rows                                              0            N/A     N/A
  User I/O Wait Time (ms)                           0            N/A     N/A
  Cluster Wait Time (ms)                            0            N/A     N/A
  Application Wait Time (ms)                        0            N/A     N/A
  Concurrency Wait Time (ms)                        0            N/A     N/A
  Invalidations                                     0            N/A     N/A
  Version Count                                     2            N/A     N/A
  Sharable Mem(KB)                                 26            N/A     N/A
            -------------------------------------------------------------
  
  Execution Plan
  ---------------------------------------------------------------------------------------------
  | Id  | Operation                    | Name         | Rows  | Bytes | Cost (%CPU)| Time     |
  ---------------------------------------------------------------------------------------------
  |   0 | UPDATE STATEMENT             |              |       |       |     2 (100)|          |
  |   1 |  UPDATE                      | TEST         |       |       |            |          |
  |   2 |   TABLE ACCESS BY INDEX ROWID| TEST         |     1 |    28 |     2   (0)| 00:00:01 |
  |   3 |    INDEX RANGE SCAN          | TEST_DT_IND  |     1 |       |     1   (0)| 00:00:01 |
  |   4 |   TABLE ACCESS BY INDEX ROWID| ACCT         |     1 |    26 |     4   (0)| 00:00:01 |
  |   5 |    INDEX RANGE SCAN          | INDX_ACCT_DT |     1 |       |     3   (0)| 00:00:01 |
  ---------------------------------------------------------------------------------------------
  
  
  
  Full SQL Text
  
  SQL ID       SQL Text
  ------------ -----------------------------------------------------------------
  51szt7b736bm UPDATE TEST SET TEST_TRN_DAY_CL = (SELECT (NVL(ACCT_CR_BAL, 0) +
                NVL(ACCT_DR_BAL, 0)) FROM ACCT WHERE ACCT_TRN_DT = (:B1 ) AND PB
               RN_ACC_NB = ACCT_ACC_NB(+)) WHERE TEST_BATCH_DT = (:B1 )

  Your contribution is very much appreciated.
  
  Thank you for taking your time to answer my question.
  
  
  Concerning

  Oracle Lover3 wrote:
  How will I know (from Plan 1 and Plan 2) whose execution plan chose for the current run?

  Since you're already on 10.2, you can identify the actual execution plan by checking in V$ SESSION SQL_ID and SQL_CHILD_NUMBER column. This can be used to identify the plan in V$ SQL_PLAN (columns SQL_ID and CHILD_NUMBER) and in 10g, you can use the convenient DBMS_XPLAN. Function DISPLAY_CURSOR for the information of the real plan using these two parameters.

  Kind regards
  Randolf

  Oracle related blog stuff:
  http://Oracle-Randolf.blogspot.com/

  SQLTools ++ for Oracle (Open source Oracle GUI for Windows):
  http://www.sqltools-plusplus.org:7676 /.
  http://sourceforge.NET/projects/SQLT-pp/

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  Start Firefox in Safe Mode {web link}
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