Remote index not used with INSERT in the local table on dblink

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  Hello!
  
  Create a test bench:

  CREATE TABLE scott.nls_demo
        (
        col_varchar            varchar2(4),
        col_char               char(4),
        col_varchar_NLS_GERMAN varchar2(4),
        col_char_NLS_GERMAN    char(4)
        );
   
  INSERT INTO scott.nls_demo (
        col_varchar,
        col_char,
        col_varchar_NLS_GERMAN,
        col_char_NLS_GERMAN  )
    SELECT 
           substr(object_name,1,4),
           substr(object_name,1,4),
           substr(object_name,1,4),
           substr(object_name,1,4)
    FROM all_objects where rownum<5000;
  
  COMMIT; 
  
  create index scott.i_varchar on scott.nls_demo (col_varchar);  
  create index scott.i_char    on scott.nls_demo (col_char);
  
  create index scott.i_varchar_NLS_GERMAN on scott.nls_demo ( NLSSORT(col_varchar_NLS_GERMAN,'nls_sort=''GERMAN_CI'''));  
  create index scott.i_char_NLS_GERMAN    on scott.nls_demo ( NLSSORT(col_char_NLS_GERMAN,   'nls_sort=''GERMAN_CI'''));
   

  Now "explain plan" these 8 select statements in SQL * more:
  

  variable c char(4);
  variable v varchar2(4);
  
  exec :c:= 'abc';
  exec :v:= 'abc';
  
  explain plan for SELECT /* 1*/ * FROM scott.nls_demo where col_varchar=:v;
  SELECT * FROM TABLE(dbms_xplan.display);
  
  explain plan for SELECT /* 2*/ * FROM scott.nls_demo where col_char=:c;
  SELECT * FROM TABLE(dbms_xplan.display);
  
  explain plan for SELECT /* 3*/ * FROM scott.nls_demo where col_varchar_NLS_GERMAN=:v;
  SELECT * FROM TABLE(dbms_xplan.display);
  
  explain plan for SELECT /* 4*/ * FROM scott.nls_demo where col_char_NLS_GERMAN=:c;
  SELECT * FROM TABLE(dbms_xplan.display);
  
  ALTER SESSION SET NLS_COMP = linguistic;
  ALTER SESSION SET NLS_SORT = german_ci;
  
  explain plan for SELECT /* 5*/ * FROM scott.nls_demo where col_varchar=:v;
  SELECT * FROM TABLE(dbms_xplan.display);
  
  explain plan for SELECT /* 6*/ * FROM scott.nls_demo where col_char=:c;
  SELECT * FROM TABLE(dbms_xplan.display);
  
  explain plan for SELECT /* 7*/ * FROM scott.nls_demo where col_varchar_NLS_GERMAN=:v;
  SELECT * FROM TABLE(dbms_xplan.display);
  
  explain plan for SELECT /* 8*/ * FROM scott.nls_demo where col_char_NLS_GERMAN=:c;
  SELECT * FROM TABLE(dbms_xplan.display);
   

  What I see on 11.2.0.2 is:
  
  1.) statement 1 would use the I_VARCHAR index, that is what I expected.
  2.) statement 2 would use the I_CHAR index, that is what I expected.
  3.) no clue used, because none are available right here for you. Understood.
  4.) no clue used, because none are available right here for you. Understood.
  
  And when define us NLS_SORT = german_ci:
  
  5.) no clue used, because none are available right here for you. Understood.
  6.) no clue used, because none are available right here for you. Understood.
  7.) I_VARCHAR_NLS_GERMAN we used. Large.
  8.) no index used, although I think that "i_char_NLS_GERMAN" would do the job...
  
  Why the index 'i_char_NLS_GERMAN' is not used with the 8 statement? Jonathan? Someone else?
  
  Thanks for your help!
  Marcus

  Not really a reason to not use TANK - although there are many of them.

  More than one reason to not always rely to "explain the plan for?

  All the variables passed in EXPLAINING the PLAN for are treated as VARCHAR2.
  In addition, there is no point setting the values of the variable because they will not cast a look either with MAP to EXPLAIN.

  SQL> CREATE TABLE nls_demo
    2        (
    3        col_varchar            varchar2(4),
    4        col_char               char(4),
    5        col_varchar_NLS_GERMAN varchar2(4),
    6        col_char_NLS_GERMAN    char(4)
    7        );
  
  Table created.
  
  SQL>
  SQL> INSERT INTO nls_demo (
    2        col_varchar,
    3        col_char,
    4        col_varchar_NLS_GERMAN,
    5        col_char_NLS_GERMAN  )
    6    SELECT
    7           substr(object_name,1,4),
    8           substr(object_name,1,4),
    9           substr(object_name,1,4),
   10           substr(object_name,1,4)
   11    FROM all_objects where rownum<5000;
  
  4999 rows created.
  
  SQL>
  SQL> commit; 
  
  Commit complete.
  
  SQL>
  SQL> create index i_varchar on nls_demo (col_varchar);  
  
  Index created.
  
  SQL> create index i_char    on nls_demo (col_char);
  
  Index created.
  
  SQL>
  SQL> create index i_varchar_NLS_GERMAN on nls_demo ( NLSSORT(col_varchar_NLS_GERMAN,'nls_sort=''GERM
  AN_CI'''));  
  
  Index created.
  
  SQL> create index i_char_NLS_GERMAN    on nls_demo ( NLSSORT(col_char_NLS_GERMAN,   'nls_sort=''GERM
  AN_CI'''));
  
  Index created.
  
  SQL>
  SQL> variable c char(4);
  SQL> variable v varchar2(4);
  SQL>
  SQL> exec :c:= 'abc';
  
  PL/SQL procedure successfully completed.
  
  SQL> exec :v:= 'abc';
  
  PL/SQL procedure successfully completed.
  
  SQL>
  SQL> ALTER SESSION SET NLS_COMP = linguistic;
  
  Session altered.
  
  SQL> ALTER SESSION SET NLS_SORT = german_ci;
  
  Session altered.
  
  SQL>
  SQL> SELECT /* 8*/ * FROM nls_demo where col_char_NLS_GERMAN=:c;
  
  no rows selected
  
  SQL> SELECT * FROM TABLE(dbms_xplan.display_cursor);
  
  PLAN_TABLE_OUTPUT
  ----------------------------------------------------------------------------------------------------
  SQL_ID  9su0j5vzuwzyj, child number 0
  -------------------------------------
  SELECT /* 8*/ * FROM nls_demo where col_char_NLS_GERMAN=:c
  
  Plan hash value: 2830339923
  
  -------------------------------------------------------------------------------------------------
  | Id  | Operation                   | Name              | Rows  | Bytes | Cost (%CPU)| Time     |
  -------------------------------------------------------------------------------------------------
  |   0 | SELECT STATEMENT            |                   |       |       |     3 (100)|          |
  |   1 |  TABLE ACCESS BY INDEX ROWID| NLS_DEMO          |    50 |  2150 |     3   (0)| 00:00:01 |
  |*  2 |   INDEX RANGE SCAN          | I_CHAR_NLS_GERMAN |    20 |       |     1   (0)| 00:00:01 |
  -------------------------------------------------------------------------------------------------
  
  Predicate Information (identified by operation id):
  ---------------------------------------------------
  
     2 - access("NLS_DEMO"."SYS_NC00006$"=NLSSORT(:C,'nls_sort=''GERMAN_CI'''))
  
  Note
  -----
     - dynamic sampling used for this statement (level=2)
  
  23 rows selected.
  
  SQL> 
  

  Published by: Dom Brooks on February 21, 2011 15:39

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  Hello
  
  Oracle 10.2.0.1
  Windows xp
  
  I'm confused why oracle did not use a partitioned below index:

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  Execution Plan
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  Plan hash value: 2899783245
  
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   Name                                                                                  Null?    Type
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   PROD_ID                                                                               NOT NULL VARCHAR2(7)
   PROD                                                                                  NOT NULL VARCHAR2(30)
   AREA                                                                                  NOT NULL VARCHAR2(30)
   SUB_AREA                                                                              NOT NULL VARCHAR2(30)
  
  SQL>

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  SQL> select count(*) from MYTABLE where PROD like 'SOAP%';
  
  Execution Plan
  ----------------------------------------------------------
  Plan hash value: 1393798969
  
  ----------------------------------------------------------------------------------------------------
  | Id  | Operation               | Name     | Rows  | Bytes | Cost (%CPU)| Time     | Pstart| Pstop |
  ----------------------------------------------------------------------------------------------------
  |   0 | SELECT STATEMENT        |          |     1 |    16 |    18   (0)| 00:00:01 |       |       |
  |   1 |  SORT AGGREGATE         |          |     1 |    16 |            |          |       |       |
  |   2 |   PARTITION RANGE SINGLE|          |  1852 | 29632 |    18   (0)| 00:00:01 |     8 |     8 |
  |*  3 |    INDEX RANGE SCAN     | PROD_IDX |  1852 | 29632 |    18   (0)| 00:00:01 |     8 |     8 |
  ---------------------------------------------------------------------------------------------------
  
  Predicate Information (identified by operation id):
  ---------------------------------------------------
  
     3 - access("PROD" LIKE 'SOAP%')
         filter("PROD" LIKE 'SOAP%')
  
  SQL>

  How to create prod_idx:

  SQL> ED
  Wrote file afiedt.buf
  
    1  create index prod_idx ON mytable(prod)
    2  global partition by range(prod)
    3  (partition prod1 values less than ('A'),
    4  partition prod2 values less than ('B'),
    5  partition prod3 values less than ('C'),
    6  partition prod4 values less than ('D'),
    7  partition prod5 values less than ('E'),
    8  partition prod6 values less than ('F'),
    9  partition prod7 values less than ('G'),
   10  partition prod8 values less than ('H'),
   11  partition prod9 values less than ('I'),
   12  partition prod10 values less than ('J'),
   13  partition prod11 values less than ('K'),
   14  partition prod12 values less than ('L'),
   15  partition prod13 values less than ('M'),
   16  partition prod14 values less than ('N'),
   17  partition prod15 values less than ('O'),
   18  partition prod16 values less than ('P'),
   19  partition prod17 values less than ('Q'),
   20  partition prod18 values less than ('R'),
   21  partition prod19 values less than ('S'),
   22  partition prod20 values less than ('T'),
   23  partition prod21 values less than ('U'),
   24  partition prod22 values less than ('V'),
   25  partition prod23 values less than ('W'),
   26  partition prod24 values less than ('X'),
   27  partition prod25 values less than ('Y'),
   28  partition prod26 values less than ('Z'),
   29* partition prod27 values less than (MAXVALUE))
  SQL> /
  
  Index created.

  SQL> select count(*) from MYTABLE;
  
  Execution Plan
  ----------------------------------------------------------
  Plan hash value: 3323402158
  
  --------------------------------------------------------------------------------------------------------------
  | Id  | Operation                      | Name                | Rows  | Cost (%CPU)| Time     | Pstart| Pstop |
  --------------------------------------------------------------------------------------------------------------
  |   0 | SELECT STATEMENT               |                     |     1 |   311   (0)| 00:00:04 |       |       |
  |   1 |  SORT AGGREGATE                |                     |     1 |            |          |       |       |
  |   2 |   PARTITION RANGE ALL          |                     |    14M|   311   (0)| 00:00:04 |     1 |    27 |
  |   3 |    BITMAP CONVERSION COUNT     |                     |    14M|   311   (0)| 00:00:04 |       |       |
  |   4 |     BITMAP INDEX FAST FULL SCAN| MS_IDX_MYTABLE      |       |            |          |     1 |    27 |
  --------------------------------------------------------------------------------------------------------------

  Table is to have 14693792 lines.
  
  Why this is the case, please guide me to understand. Thank you.
  
  Published by: user12050217 on July 29, 2010 23:37
  
  Published by: user12050217 on July 29, 2010 23:38