Function Index problem.

Hello

I have a problem regarding a function function index.

example:

TableName: Test

Column: A, B, C, D

I create the index on the table, column, a test using a user-defined function.

If I do a select on the column, he'll be fine. In other words, I'll get the results you want.

However, if I insert in the table and validation, and I do a query using the 'A' column in the where clause. I don't have any query hits. Its really weird.

Have you ever experienced this problem? and is there an index of function according to back and donts w.r.t.?

Thank you.

MichaelR

If you use a deterministic function really, it works:

create or replace function test_fn (p_number number) return number deterministic
is
  vreturn number := 0;
begin
  if p_number = 1 then vreturn := 55; end if;
  if p_number = 2 then vreturn := 89; end if;
  return vreturn;
end;

Or, if you reverse the order of your second inserts (insert the folder before the recording of test1 test2) - it works fine.

The reason why you get no results is when you insert the file test1 with a = 2, Oracle executes the function and gets no data, so it assumes that the result is NULL and puts in the index. You said Oracle function is deterministic, so he starts from the principle that any time test_fn (2) is called, it retrieves a null response.

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| Id  | Operation               | Name      | Rows  | Bytes |TempSpc| Cost (%CPU
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-------------

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-------------


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---------------------------------------------------

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Statistics
----------------------------------------------------------
        139  recursive calls
          0  db block gets
        279  consistent gets
          0  physical reads
          0  redo size
        695  bytes sent via SQL*Net to client
        400  bytes received via SQL*Net from client
          2  SQL*Net roundtrips to/from client
          5  sorts (memory)
          0  sorts (disk)
         10  rows processed 

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Execution Plan
----------------------------------------------------------
Plan hash value: 1978014138

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------------------------

| Id  | Operation                      | Name          | Rows  | Bytes |TempSpc|
 Cost (%CPU)| Time     |

--------------------------------------------------------------------------------
------------------------

|   0 | SELECT STATEMENT               |               |    10 |   740 |       |
 22869   (1)| 00:04:35 |

|*  1 |  COUNT STOPKEY                 |               |       |       |       |
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|   2 |   VIEW                         |               | 49902 |  3606K|       |
 22869   (1)| 00:04:35 |

|*  3 |    SORT ORDER BY STOPKEY       |               | 49902 |  1559K|  3928K|
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|   4 |     TABLE ACCESS BY INDEX ROWID| TEST_SORT     | 49902 |  1559K|       |
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|*  5 |      INDEX RANGE SCAN          | I_TEST_SORT_1 | 49902 |       |       |
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--------------------------------------------------------------------------------
------------------------


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

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Statistics
----------------------------------------------------------
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      22393  consistent gets
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          0  redo size
        695  bytes sent via SQL*Net to client
        400  bytes received via SQL*Net from client
          2  SQL*Net roundtrips to/from client
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          0  sorts (disk)
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Execution Plan
----------------------------------------------------------
Plan hash value: 4154852915

--------------------------------------------------------------------------------
---------------

| Id  | Operation                     | Name          | Rows  | Bytes | Cost (%C
PU)| Time     |

--------------------------------------------------------------------------------
---------------

|   0 | SELECT STATEMENT              |               |    10 |   740 |     8
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|*  1 |  COUNT STOPKEY                |               |       |       |
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|   2 |   VIEW                        |               |    10 |   740 |     8
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|   3 |    TABLE ACCESS BY INDEX ROWID| TEST_SORT     | 49902 |  1559K|     8
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|*  4 |     INDEX RANGE SCAN          | I_TEST_SORT_1 |    10 |       |     3
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---------------


Predicate Information (identified by operation id):
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   1 - filter(ROWNUM<11)
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