About operator not using thesaurus

Hello,
I'm trying to use about query, and extending my knowledge base by loading a thesaurus,
but it doesn't seem like working...
Can someone tell me what i'm doing wrong?...
This is my table:
X@dev> select * from test_table;
NUM STR
1 my car is big
2 automobile is good
3 the sea is blue
4 the ocean is wide
5 surf forever
This is my thesaurus:
Seas
SYN Breakers
SYN Estuaries
SYN Surf
SYN Waves
NT Oceans
Then loading:
ctxload -user x/x@dev -thes -name default -file test
Then compiling:
ctxkbtc -user x/x@dev -name default
Then:
begin
ctx_ddl.create_preference('mylex','BASIC_LEXER');
ctx_ddl.set_attribute('mylex','index_themes','YES');
ctx_ddl.set_attribute('mylex','index_text','YES');
ctx_ddl.set_attribute ( 'mylex', 'mixed_case', 'NO');
ctx_ddl.set_attribute ( 'mylex', 'PROVE_THEMES', 'NO');
end;
and creating the index:
create index test_idx on test_table(str) indextype is ctxsys.context
parameters ('LEXER mylex');
but then:
X@dev> select * from test_table where contains(str,'syn(sea)',1)>0;
NUM STR
3 the sea is blue
X@dev> select * from test_table where contains(str,'syn(seas)',1)>0;
NUM STR
5 surf forever
X@dev> select * from test_table where contains(str,'about(sea)',1)>0;
NUM STR
3 the sea is blue
X@dev> select * from test_table where contains(str,'about(seas)',1)>0;
NUM STR
3 the sea is blue
The about operator is not using the thesaurus. why?
and also:
X@dev> select * from test_table where contains(str,'about(SEA)',1)>0;
no rows selected
If the mixed_case is set to "NO" i'm supposed to get results with upper case as well, don't I?
Thanks for your help!!

Hi,
Check this out - seems to match what you're experiencing:
Expectations of the Thesaurus??????
-Ron

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About query not using extended knowledge base

Hello,
I compiled a small thesaurus to the knowledge base:
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It contains:
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NT BAVARIAN
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Field is indexed with a context index, and the index is synchronized.
I'm using 8.1.7.2 english.
Using an ABOUT operator, I always get 1 hit.
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The (9i) doc says:
When you augment the existing knowledge base with your new thesaurus, you query with the ABOUT operator which implicitly expands to synonyms and narrower terms.
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Thanks

Hello.
Did you load the supplied english thesaurus as your DEFAULT thesaurus using the command line utility ctxload (or some other method)?
I had the same experience until I loaded the sample thesaurus in $ORACLE_HOME/ctx/sample/thes/. Now my ABOUT and SYN queries work as expected though I still have a concern about the incomplete nature of the sample thesauri (I'll open a new thread on that topic).
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Hello again,
Another question here,
I've searched through the forum and have found other
posts on the same problem but no solutions, though
the problem isn't always the primary topic of the
forum. I've put this post up to hopefully put this
to rest as I'm pretty sure this is just a
configuration issue.
I am using an ABOUT operator in a CONTAINS query and
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file_repository.file_id,
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Hello.
Did you load the supplied english thesaurus as your DEFAULT thesaurus using the command line utility ctxload (or some other method)?
I had the same experience until I loaded the sample thesaurus in $ORACLE_HOME/ctx/sample/thes/. Now my ABOUT and SYN queries work as expected though I still have a concern about the incomplete nature of the sample thesauri (I'll open a new thread on that topic).
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Hi,
I'm new to Oracle and this forums too. I have a problem when using about operator in contains query.
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name         VARCHAR2(200)   NOT NULL,
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Edited by: user2944391 on Jul 10, 2009 3:25 AM

Hello (and welcome),
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And by the way, it will help others to analyse if you put {noformat}{noformat} (lowercase code in curly brackets) before and after your code snippets.
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