Indexing of files txt only text Oracle

Hello

I have this work on a 10g database and I was wondering why it doesn't in this case particularly in 11g. I use the following code to the index of my files:
DROP INDEX ksk_file_table_ctx1;

BEGIN
   ctx_ddl.drop_preference ('CCP_OC_LEXER');
   ctx_ddl.create_preference ('CCP_OC_LEXER', 'BASIC_LEXER');
   ctx_ddl.set_attribute ('CCP_OC_LEXER', 'MIXED_CASE', 'NO');
END;
/

CREATE INDEX ksk_file_table_ctx1 ON ksk_file_table(blob_content)
INDEXTYPE IS
ctxsys.CONTEXT PARAMETERS ('LEXER CCP_OC_LEXER sync (on commit)');



BEGIN
   DBMS_STATS.gather_table_stats ('CCP_OC', 'ksk_file_table',
                                  CASCADE      => TRUE);
END;
Now, if I try to search for content by using this query:
SELECT score (1) relevance, subject file_name, ID, ctx_doc.snippet snippet
  FROM ksk_file_table
 WHERE contains (blob_content, :p712_subject, 1) > 0
I get only a few results if I struck a text file and I'm not able to pick up on anything that it is stored in other types of document (pdf, doc and others).

No idea why?

Denes Kubicek
-------------------------------------------------------------------
http://deneskubicek.blogspot.com/
http://www.Opal-consulting.de/training
http://Apex.Oracle.com/pls/OTN/f?p=31517:1
-------------------------------------------------------------------

I found that, although it shouldn't make a difference, sometimes he allows to explicitly declare the filter in your settings when you create the index:

CREATE INDEX ksk_file_table_ctx1
ON ksk_file_table (blob_content)
INDEXTYPE IS ctxsys. FRAMEWORK
PARAMETERS
("LEXER CCP_OC_LEXER
FILTER CTXSYS. AUTO_FILTER
Sync (on commit)');

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