MERGE operator. Logic of work.

Dear Oracle experts,
I noticed that in some examples logical MERGER work differs from the standard against which tool you use.

We will check following example in TOAD, sqlplus and you will see that the priority of deletion in the MERGER is higher than the priority of the update.

create the t_72 table (id1 number, varchar2 (10) Text1, num1);
insert into t_72 values (1, 'ok', 105);
insert into t_72 values (2, 'nok', 106);
insert into t_72 values (3, 'nok', 107);
create table t_73 (id2 number, Text2 varchar2 (10), num2);
insert into t_73 values (1, 'nok', 110);
insert into t_73 values (2, 'ok', 111);
insert into t_73 values (4, 'w', 112);
commit;

merge into t_72
using t_73
on (id1 = id2)
when matched, then update set text1 Text2 =
Delete where text1 = "nok".
When not matched then insert values (id2, text2, num2);

Select * from t_72;

What do you see? Line with id1 has not been deleted, but was stored with id2.


Now please check this one in PL/SQL - it will work correctly.

Could not explain why I'm dealing with 2 other MERGE logic?

The correct behavior is that the deletion should be applied after the update has been applied.

In the example, id1 should be deleted because 'ok' should have been upgrade "nok".

Considering that id2 should not be deleted as "nok" should have been updated for 'ok '.

(And id3 should be left alone and inserted id4)

This is obviously a bug as it was discussed in 11.2.0.3, but having had a look in the Support of Oracle online, it is not obvious that he is one of the most exposed. However, as do a search on "bad results" and "outer join" or "fusion" has produced a good number of results...

In 11.2.0.2:

SQL> select * from v$version;

BANNER
--------------------------------------------------------------------------------
Oracle Database 11g Enterprise Edition Release 11.2.0.2.0 - 64bit Production
PL/SQL Release 11.2.0.2.0 - Production
CORE    11.2.0.2.0      Production
TNS for Linux: Version 11.2.0.2.0 - Production
NLSRTL Version 11.2.0.2.0 - Production

SQL> select * from t_72;

       ID1 TEXT1            NUM1
---------- ---------- ----------
         1 ok                105
         2 nok               106
         3 nok               107

SQL> @merge

3 rows merged.

SQL> select * from table(dbms_xplan.display_cursor);

PLAN_TABLE_OUTPUT
------------------------------------------------------------------------------------------------------------------------
SQL_ID  4jjmpqv9muw31, child number 0
-------------------------------------
merge into t_72 using t_73 on (id1=id2) when matched then update set
text1=text2 delete where text1='nok' when not matched then insert
values (id2,text2,num2)

Plan hash value: 50174811

------------------------------------------------------------------------------
| Id  | Operation             | Name | Rows  | Bytes | Cost (%CPU)| Time     |
------------------------------------------------------------------------------
|   0 | MERGE STATEMENT       |      |       |       |    12 (100)|          |
|   1 |  MERGE                | T_72 |       |       |            |          |
|   2 |   VIEW                |      |       |       |            |          |
|   3 |    NESTED LOOPS OUTER |      |     3 |   234 |    12   (0)| 00:00:01 |
|   4 |     TABLE ACCESS FULL | T_73 |     3 |    99 |     3   (0)| 00:00:01 |
|   5 |     VIEW              |      |     1 |    45 |     3   (0)| 00:00:01 |
|*  6 |      TABLE ACCESS FULL| T_72 |     1 |    45 |     3   (0)| 00:00:01 |
------------------------------------------------------------------------------

Predicate Information (identified by operation id):
---------------------------------------------------

   6 - filter("ID1"="ID2")

SQL> select * from t_72;

       ID1 TEXT1            NUM1
---------- ---------- ----------
         1 nok               105
         3 nok               107
         4 w                 112

SQL>

Whereas a merger without deleting seems to do the right stuff:

SQL>  select * from t_72;

       ID1 TEXT1            NUM1
---------- ---------- ----------
         1 ok                105
         2 nok               106
         3 nok               107

SQL> @merge_nodel

3 rows merged.

SQL>  select * from table(dbms_xplan.display_cursor);

PLAN_TABLE_OUTPUT
------------------------------------------------------------------------------------------------------------------------
SQL_ID  4x0ry1a5yg555, child number 0
-------------------------------------
merge into t_72 using t_73 on (id1=id2) when matched then update set
text1=text2 when not matched then insert values (id2,text2,num2)

Plan hash value: 50174811

------------------------------------------------------------------------------
| Id  | Operation             | Name | Rows  | Bytes | Cost (%CPU)| Time     |
------------------------------------------------------------------------------
|   0 | MERGE STATEMENT       |      |       |       |    12 (100)|          |
|   1 |  MERGE                | T_72 |       |       |            |          |
|   2 |   VIEW                |      |       |       |            |          |
|   3 |    NESTED LOOPS OUTER |      |     3 |   234 |    12   (0)| 00:00:01 |
|   4 |     TABLE ACCESS FULL | T_73 |     3 |    99 |     3   (0)| 00:00:01 |
|   5 |     VIEW              |      |     1 |    45 |     3   (0)| 00:00:01 |
|*  6 |      TABLE ACCESS FULL| T_72 |     1 |    45 |     3   (0)| 00:00:01 |
------------------------------------------------------------------------------

Predicate Information (identified by operation id):
---------------------------------------------------

   6 - filter("ID1"="ID2")

SQL> select * from t_72;

       ID1 TEXT1            NUM1
---------- ---------- ----------
         1 nok               105
         2 ok                106
         3 nok               107
         4 w                 112

SQL>

The merger, without deleting has the same execution plan, but there are a number of bugs around FUSION and that can be merged if VIEWS this plan faced with views that may be non-merged, we are in a ballpark with known problems/bugs "bad results".

But base on these correct update of the results, I would expect the delete clause to remove line 1 NOT row 2.

Which is what you see in 11.2.0.3, as others have noticed

SQL> select * from t_72;

       ID1 TEXT1            NUM1
---------- ---------- ----------
         1 ok                105
         2 nok               106
         3 nok               107

SQL> @merge

3 rows merged.

SQL> select * from table(dbms_xplan.display_cursor);

PLAN_TABLE_OUTPUT
------------------------------------------------------------------------------------------------------------------------
SQL_ID  4jjmpqv9muw31, child number 0
-------------------------------------
merge into t_72 using t_73 on (id1=id2) when matched then update set
text1=text2 delete where text1='nok' when not matched then insert
values (id2,text2,num2)

Plan hash value: 659680654

-----------------------------------------------------------------------------
| Id  | Operation            | Name | Rows  | Bytes | Cost (%CPU)| Time     |
-----------------------------------------------------------------------------
|   0 | MERGE STATEMENT      |      |       |       |     7 (100)|          |
|   1 |  MERGE               | T_72 |       |       |            |          |
|   2 |   VIEW               |      |       |       |            |          |
|*  3 |    HASH JOIN OUTER   |      |     3 |   234 |     7  (15)| 00:00:01 |
|   4 |     TABLE ACCESS FULL| T_73 |     3 |    99 |     3   (0)| 00:00:01 |
|   5 |     TABLE ACCESS FULL| T_72 |     3 |   135 |     3   (0)| 00:00:01 |
-----------------------------------------------------------------------------

Predicate Information (identified by operation id):
---------------------------------------------------

   3 - access("ID1"="ID2")

SQL> select * from t_72;

       ID1 TEXT1            NUM1
---------- ---------- ----------
         2 ok                106
         3 nok               107
         4 w                 112

SQL>

The execution plan change is perhaps significant? Perhaps.

Now please check this one in PL/SQL - it will work correctly.

I tried this in the 11.2.0.2 environment. Same behavior as SQL.
If you get a difference however, investigate all the differences in the execution plan, etc.

But, "bad results" bugs - far too many of them.

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  2  /


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DFgroup.DFBtn.onClick = function(){   
     DFdefault = new Folder(DARKinputFolder);   
     DFdefault = Folder.selectDialog('****Please Select The Folder Where Your DARK FRAMES Are Located****',DARKinputFolder);
     if ( DFdefault != null ) {
  DARKinputFolder = DFdefault.fsName.toString()
                       DFgroup.DFlabel.text = DARKinputFolder;
                       FolderChecker()
                     
  }
     }

LFgroup.LFBtn.onClick = function(){   
     LFdefault = new Folder(LIGHTinputFolder);  
     LFdefault = Folder.selectDialog('****Please Select The Folder Where Your LIGHT FRAMES Are Located****',LIGHTinputFolder);
      if ( LFdefault != null ) {
  LIGHTinputFolder = LFdefault.fsName.toString()
                       LFgroup.LFlabel.text = LIGHTinputFolder;
                       FolderChecker()
  }
      }





function FolderChecker(){
    if (DARKinputFolder !='' && LIGHTinputFolder !=''){// && LFdefault != null){
    BTNg.OKBtn.enabled = true;
    }
}

    Ok

    with a bit of violin it looks as if I had a result, here's what I used:

    function FolderChecker(){
   if (DFdefault.exists && LFdefault.exists){
    BTNg.OKBtn.enabled = true;
    }
}

    This seems to work perfectly.

    Thank you for pointing me in the right direction.

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