Database Software

Hi!!
I followed the steps described in the reference guide of Oracle Text to highlights the result of a search in a text, but I can't show the text whit these words highlighting.

I copy the code I ran:

create table hightab(query_id number,
offset number,
length number);
Table created

begin
ctx_doc.highlight('sentencias', '4', 'redactor', 'hightab', 0, TRUE);
end;

PL/SQL procedure successfully completed

select * from hightab

QUERY_ID OFFSET LENGTH
0 89 8

Thanks a lot!
Regards,
Fabiana.