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Date: Wed, 7 Mar 2007 23:49:27 +0300 (MSK)
From: Oleg Bartunov <oleg@sai.msu.su>
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To: Sumeet <asumeet@gmail.com>
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Subject: Re: tesearch2 question
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On Wed, 7 Mar 2007, Sumeet wrote:

> Thanks Oleg,
>
> My String message are Abstracts of papers, I did a
>
> $ select avg(len) from (select length(abstract) as len from master_table
> limit 500) E;
>
>         avg
> -----------------------
> 1355.5907859078590786
> (1 row)
>
> so length is approx 1400.

that'is  about 18 Gb of text ! What's your hardware ?

>
>
> I couldn't find any appropriate way to analyze the time for update queries,
> but what i did was a explain analyze
>
> $ explain analyze select to_tsvector(article_title) from master_table limit
> 1000;
>
> The total runtime was approx 500ms.

just issue \timing in psql before executing update command.
Then you could estimate total time.

>
> The server is Sun OS 5.10, with around 8gigs of RAM and 6cpus.
>
> Thanks,
> Sumeet.
>
>
>
> On 3/7/07, Oleg Bartunov <oleg@sai.msu.su> wrote:
>> 
>> On Wed, 7 Mar 2007, Sumeet wrote:
>> 
>> > Hi All,
>> >
>> > I'm trying to udpate a table containing  13149741 records. And its
>> taking
>> > forever to complete this process.
>> >
>> > The update query i'm trying to run is for full text indexing similiar to
>> >
>> > UPDATE tblMessages SET idxFTI=to_tsvector(strMessage);
>> >
>> 
>> How big are your strMessage ? and what's your tsearch2 configuration ?
>> Can you estimate how long takes updating, for example, 1000 rows ?
>> It looks like your system is IO bound. What's your hardware ?
>> 
>> >
>> > Below are some of the stats which might be helpful for analyzing this
>> >
>> > $top
>> >
>> >  PID USERNAME LWP PRI NICE  SIZE   RES STATE    TIME    CPU COMMAND
>> > 3091 postgres   1  43    0   46M   38M cpu/1  200:06  3.20% postgres
>> > 5052 postgres   1  60    0  149M  134M sleep    0:17  3.12% postgres
>> >
>> > <<<here are the top 2 processes, out of which the first process i have
>> been
>> > running almost for a day and a half and it is still running,
>> >
>> > This table which i'm trying to  update has 10 indexes
>> >
>> > =========================================================
>> > "a_article_pk" PRIMARY KEY, btree (id)
>> >   "a_article_uk_pmid" UNIQUE, btree (pmid)
>> >   "a_article_idx_abstract" btree ("substring"(abstract::text, 0, 255))
>> >   "a_article_idx_date_cr_year" btree (date_cr_year)
>> >   "a_article_idx_ml_journal_info_medline_ta" btree
>> (ml_journal_info_a_ta)
>> >   "a_article_idx_owner" btree ("owner")
>> >   "a_article_idx_pmid" btree (pmid)
>> >   "a_article_idx_status" btree (status)
>> >   "a_article_idx_title" btree (article_title)
>> >   "a_master_t_idx_year_published" btree (published_year)
>> > ========================================================
>> > But no indexes on the field i'm trying to update. The field i'm trying
>> to
>> > add is a new field.
>> > Can anyone help me out to figure out why is it taking so much time to
>> update
>> > the table.
>> >
>> > Also as u see in the above indexes, I have some indexes on some varchar
>> > column which i feel are totally useless unless u so a exact string
>> match.
>> > But does that help in any sense for improving the speed of retreiving
>> the
>> > string just normally without any search on it?
>> >
>> > Thanks,
>> > Sumeet.
>> >
>>
>>         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
>> 
>
>
>
>

 	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