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.
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.
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
--
Thanks,
Sumeet Ambre
Master of Information Science Candidate,
Indiana University.
