SEO

On Mon, Jan 23, 2006 at 03:05:07PM +0530, Praveen Kumar (TUV) wrote:
> I have installed Tsearch-Module for full text indexing .But when
> I search text using gist(idxFTI) index on table I also found all
> data which have same accent.Example
> 1.If I try search for MANI word it also search for MANY word.
> 2.If I try search for ANDY word it also search for ANDI word.
> Please can you tell me how to avoid this problem ? If i want to
> search text MANI it should search only for MANI not MANY.

Your tsearch2 configuration is turning the words "many" and "andy"
into the lexemes "mani" and "andi", like this:

test=> SELECT * FROM ts_debug('many andy');
ts_name | tok_type | description | token | dict_name | tsvector
---------+----------+-------------+-------+-----------+----------
default | lword | Latin word | many | {en_stem} | 'mani'
default | lword | Latin word | andy | {en_stem} | 'andi'
(2 rows)

To learn how to change that see "Parsing and Lexing" and "Configurations"
in the tsearch2 documentation:

http://www.sai.msu.su/~megera/postgr...parsing_lexing
http://www.sai.msu.su/~megera/postgr...configurations

Another approach is to think of tsearch2 as returning "might match"
rows and add another restriction to find the definite matches:

test=> SELECT * FROM foo
test-> WHERE idxcontent @@ to_tsquery('many');
id | content | idxcontent
----+---------+------------
1 | many | 'mani':1
2 | mani | 'mani':1
(2 rows)

test=> SELECT * FROM foo
test-> WHERE idxcontent @@ to_tsquery('many') AND content ~* 'many';
id | content | idxcontent
----+---------+------------
1 | many | 'mani':1
(1 row)

--
Michael Fuhr

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TIP 9: In versions below 8.0, the planner will ignore your desire to
choose an index scan if your joining column's datatypes do not
match

The simplest way is to use custom dictionary like 'synonym' !
many:many
and let it first dictionary !

Oleg
On Mon, 23 Jan 2006, Michael Fuhr wrote:

> On Mon, Jan 23, 2006 at 03:05:07PM +0530, Praveen Kumar (TUV) wrote:
>> I have installed Tsearch-Module for full text indexing .But when
>> I search text using gist(idxFTI) index on table I also found all
>> data which have same accent.Example
>> 1.If I try search for MANI word it also search for MANY word.
>> 2.If I try search for ANDY word it also search for ANDI word.
>> Please can you tell me how to avoid this problem ? If i want to
>> search text MANI it should search only for MANI not MANY.
>
> Your tsearch2 configuration is turning the words "many" and "andy"
> into the lexemes "mani" and "andi", like this:
>
> test=> SELECT * FROM ts_debug('many andy');
> ts_name | tok_type | description | token | dict_name | tsvector
> ---------+----------+-------------+-------+-----------+----------
> default | lword | Latin word | many | {en_stem} | 'mani'
> default | lword | Latin word | andy | {en_stem} | 'andi'
> (2 rows)
>
> To learn how to change that see "Parsing and Lexing" and "Configurations"
> in the tsearch2 documentation:
>
> http://www.sai.msu.su/~megera/postgr...parsing_lexing
> http://www.sai.msu.su/~megera/postgr...configurations
>
> Another approach is to think of tsearch2 as returning "might match"
> rows and add another restriction to find the definite matches:
>
> test=> SELECT * FROM foo
> test-> WHERE idxcontent @@ to_tsquery('many');
> id | content | idxcontent
> ----+---------+------------
> 1 | many | 'mani':1
> 2 | mani | 'mani':1
> (2 rows)
>
> test=> SELECT * FROM foo
> test-> WHERE idxcontent @@ to_tsquery('many') AND content ~* 'many';
> id | content | idxcontent
> ----+---------+------------
> 1 | many | 'mani':1
> (1 row)
>
>

Regards,
Oleg
__________________________________________________ ___________
Oleg Bartunov, Research Scientist, Head of AstroNet (www.astronet.ru),
Sternberg Astronomical Institute, Moscow University, Russia
Internet: oleg@sai.msu.su, http://www.sai.msu.su/~megera/
phone: +007(495)939-16-83, +007(495)939-23-83

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TIP 2: Don't 'kill -9' the postmaster