Problem with MULTI-COLUMN Data Store

Question

I am using multi column store on 2 CLOB columns in the table while creating a context index. After creating the context index, when i run my contains clause for certain words; it actually returns all the records in that table. When i search the $i table for these words, it shows that the word occurs in all the records even though it doesn't. I assume that when indexing the words, the special characters aren't being handled at all. So, i need a way to efficiently handle the special characters in the text. Also, need to know; how are the special characters handled when context index is created on a single column (As i haven't been facing any problems when mining data such columns).
The script i used for creating the context index is given below :
BEGIN
ctx_ddl.create_preference ('MLT_COLUMN_STORE', 'MULTI_COLUMN_DATASTORE');
ctx_ddl.set_attribute ('MLT_COLUMN_STORE',
'columns',
'column1,column2'
EXECUTE IMMEDIATE 'CREATE INDEX routine_task_ctx_idx '
|| 'ON routine_table (column1) '
|| 'INDEXTYPE IS CTXSYS.CONTEXT '
|| 'PARAMETERS '
|| '(''DATASTORE MLT_COLUMN_STORE'
|| ' FILTER CTXSYS.NULL_FILTER'
|| ' STOPLIST CTXSYS.EMPTY_STOPLIST'
|| ' LEXER CTXSYS.BASIC_LEXER'')'
|| ' PARALLEL 2';
END;

Answer 1

Hi,
is it possible to give an example of how your data looks like? What are these special characters? Oracle Text includes option like printjoins and skipjoins which give special meanings to characters. So an example will guide us for helping you.
Herald ten Dam
http://htendam.wordpress.com