CTXCAT index - lack of rows in the result set

Hello
I created CTXCAT index, I discovered that some lack of lines during the search with CARSEARCH against LIKE:
Select txt from udbm where a.txt as ' 01% 1234% '
less
Select txt from udbm where catsearch(a.txt,'01*1234*',null) > 0;

There are 58 selected in the above query, i.e. Select after fewer returns less lines
some of the missing values:
015917056060 = 363200141234?
015929050101 = 001234277002?
015930020900 = 532012347800?
015935450000 = 123404819523?

It seems that this problem is = (equal sign). Probably at the time of creation of index CTXCAT txt is divided into 2 parts with = sign as a delimiter.

How to solve this problem?

Full text index uses a few settings in the lexer to define what - printjoin and a skipjoin.
See here [url http://docs.oracle.com/cd/E11882_01/text.112/e24435/ind.htm#CIHFFIFB] documentation for specification.

The printjoin specifies special characters, you want to be considered as part of the words.
The skipjoin specifies the characters you want to be considered as word separators.
By default most likely values considers the equal sign to be a character of "skipjoin.

I think the best would be to define the equal sign as a printjoin character. The URL of the above documentation also gives a link to an example of how to do this.

Tags: Database

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    Published by: user652714 on January 5, 2010 11:23

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  2  (
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  4          SELECT 'AMY'    AS NAME, 2 AS TYPE_ID, 3 AS DESC_ID FROM DUAL UNION ALL
  5          SELECT 'BILL'   AS NAME, 2 AS TYPE_ID, 5 AS DESC_ID FROM DUAL UNION ALL
  6          SELECT 'BOB'    AS NAME, 2 AS TYPE_ID, 7 AS DESC_ID FROM DUAL UNION ALL
  7          SELECT 'CARL'   AS NAME, 2 AS TYPE_ID, 1 AS DESC_ID FROM DUAL UNION ALL
  8          SELECT 'CHRIS'  AS NAME, 1 AS TYPE_ID, 8 AS DESC_ID FROM DUAL UNION ALL
  9          SELECT 'DAN'    AS NAME, 1 AS TYPE_ID, 4 AS DESC_ID FROM DUAL UNION ALL
 10          SELECT 'DEREK'  AS NAME, 2 AS TYPE_ID, 6 AS DESC_ID FROM DUAL
 11  )
 12  SELECT  NAME
 13  ,       DESC_ID
 14  FROM    xTable
 15  ORDER BY
 16          (CASE
 17                  WHEN DESC_ID IN (2,8,4)         THEN 1
 18                  WHEN DESC_ID IN (1,3,5,6,7)     THEN 2
 19          END)
 20  ,       1
 21  /

NAME               DESC_ID
----- --------------------
ALAN                     2
CHRIS                    8
DAN                      4
AMY                      3
BILL                     5
BOB                      7
CARL                     1
DEREK                    6

8 rows selected.

    Another option would be to use the UNION, but he strikes the table twice instead of once as described above:

    SQL> WITH xTable AS
  2  (
  3          SELECT 'ALAN'   AS NAME, 1 AS TYPE_ID, 2 AS DESC_ID FROM DUAL UNION ALL
  4          SELECT 'AMY'    AS NAME, 2 AS TYPE_ID, 3 AS DESC_ID FROM DUAL UNION ALL
  5          SELECT 'BILL'   AS NAME, 2 AS TYPE_ID, 5 AS DESC_ID FROM DUAL UNION ALL
  6          SELECT 'BOB'    AS NAME, 2 AS TYPE_ID, 7 AS DESC_ID FROM DUAL UNION ALL
  7          SELECT 'CARL'   AS NAME, 2 AS TYPE_ID, 1 AS DESC_ID FROM DUAL UNION ALL
  8          SELECT 'CHRIS'  AS NAME, 1 AS TYPE_ID, 8 AS DESC_ID FROM DUAL UNION ALL
  9          SELECT 'DAN'    AS NAME, 1 AS TYPE_ID, 4 AS DESC_ID FROM DUAL UNION ALL
 10          SELECT 'DEREK'  AS NAME, 2 AS TYPE_ID, 6 AS DESC_ID FROM DUAL
 11  )
 12  SELECT  NAME
 13  ,       DESC_ID
 14  FROM
 15  (
 16          SELECT  NAME
 17          ,       DESC_ID
 18          ,       1 AS ORD_COL
 19          FROM    xTable
 20          WHERE   DESC_ID IN (2,8,4)
 21          UNION
 22          SELECT  NAME
 23          ,       DESC_ID
 24          ,       2 AS ORD_COL
 25          FROM    xTable
 26          WHERE   DESC_ID IN (1,3,5,6,7)
 27  )
 28  ORDER BY ORD_COL
 29  ,       NAME
 30  /

NAME               DESC_ID
----- --------------------
ALAN                     2
CHRIS                    8
DAN                      4
AMY                      3
BILL                     5
BOB                      7
CARL                     1
DEREK                    6

8 rows selected.

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