Re: Tsearch2 really slower than ilike ?

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1;2c1;2c1;2cBlin !

what's happenning with my terminal when I read messagess from this guy ?
I don't even know how to call him - I see just Herv?

Oleg
1;2c1;2c1;2c1;2c
1;2cOn Thu, 18 Nov 2004, [iso-8859-15] Herv? Piedvache wrote:

> Le Jeudi 18 Novembre 2004 10:37, Oleg Bartunov a ?crit :
>> Have you run 'vacuum analyze' ?
>
> Yep every night VACUUM FULL VERBOSE ANALYZE; of all the database !
>
>> 1;2c1;2c1;2c
>> 1;2c1;2c1;2cmy desktop is very simple PIII, 512 Mb RAM.
>> 1;2c1;2c11;2c1;2c1;2c;2c Oleg1;2c1;2c1;2c
>> 11;2c1;2c1;2c;2c1;2c1;2c
>
> YOU send strange caracters ! ;o)
>
>> 1;2c1;2c1;2cOn Thu, 18 Nov 2004, [iso-8859-15] Herv? Piedvache wrote:
>>> Oleg,
>>>
>>> Le Mercredi 17 Novembre 2004 18:23, Oleg Bartunov a ?crit :
>>>>> Sorry but when I do your request I get :
>>>>> # select id_site from site where idx_site_name @@  'livejourn';
>>>>> ERROR:  type " " d1;2c1;2c1;2c1;2coes not exist
>>>>
>>>> no idea :) btw, what version of postgresql and OS you're running.
>>>> Could you try minimal test - check sql commands from tsearch2 sources,
>>>> some basic queries from tsearch2 documentation, tutorials.
>>>>
>>>> btw, your query should looks like
>>>> select id_site from site_rss where idx_site_name @@ 'livejourn';
>>>> ^^^^^^^^
>>>>
>>>> How did you run your queries at all ? I mean your first message about
>>>> poor tsearch2 performance.
>>>
>>> I don't know what happend yesterday ... it's running now ...
>>>
>>> You sent me :
>>> zz=# explain analyze select id_site from site_rss where idx_site_name
>>> @@  'livejourn';
>>>                                                              QUERY PLAN
>>> -------------------------------------------------------------------------
>>> ---------------------------------------------------------- Index Scan
>>> using ix_idx_site_name on site_rss  (cost=0.00..733.62 rows=184 width=4)
>>> (actual time=0.339..39.183 rows=1737 loops=1)
>>>     Index Cond: (idx_site_name @@ '\'livejourn\''::tsquery)
>>>     Filter: (idx_site_name @@ '\'livejourn\''::tsquery)
>>>   Total runtime: 40.997 ms
>>> (4 rows)
>>>
>>>> It's really fast ! So, I don't understand your problem.
>>>> I run query on my desktop machine, nothing special.
>>>
>>> I get this :
>>> QUERY PLAN
>>> -------------------------------------------------------------------------
>>> ---------------------------------------------------------------- Index
>>> Scan using ix_idx_site_name on site_rss s (cost=0.00..574.19 rows=187
>>> width=24) (actual time=105.097..7157.277 rows=388 loops=1)
>>> Index Cond: (idx_site_name @@ '\'livejourn\''::tsquery)
>>> Filter: (idx_site_name @@ '\'livejourn\''::tsquery)
>>> Total runtime: 7158.576 ms
>>> (4 rows)
>>>
>>> With the ilike I get :
>>> QUERY PLAN
>>> -------------------------------------------------------------------------
>>> ----------------------------------- Seq Scan on site_rss s
>>> (cost=0.00..8360.23 rows=1 width=24) (actual time=8.195..879.440 rows=404
>>> loops=1)
>>> Filter: (site_name ~~* '%livejourn%'::text)
>>> Total runtime: 882.600 ms
>>> (3 rows)
>>>
>>> I don't know what is your desktop ... but I'm using PostgreSQL 7.4.6, on
>>> Debian Woody with a PC Bi-PIII 933 Mhz and 1 Gb of memory ... the server
>>> is dedicated to this database ... !!
>>>
>>> I have no idea !
>>>
>>> Regards,
>>
>> Regards,
>> Oleg
>> _____________________________________________________________
>> Oleg Bartunov, sci.researcher, hostmaster of AstroNet,
>> Sternberg Astronomical Institute, Moscow University (Russia)
>> Internet: oleg(at)sai(dot)msu(dot)su, http://www.sai.msu.su/~megera/
>> phone: +007(095)939-16-83, +007(095)939-23-83
>> ---------------------------(end of broadcast)---------------------------
>> TIP 8: explain analyze is your friend
>
>

Regards,
Oleg
_____________________________________________________________
Oleg Bartunov, sci.researcher, hostmaster of AstroNet,
Sternberg Astronomical Institute, Moscow University (Russia)
Internet: oleg(at)sai(dot)msu(dot)su, http://www.sai.msu.su/~megera/
phone: +007(095)939-16-83, +007(095)939-23-83
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