Re: feeding big script to psql

Tom,

My queries were written in multi-line mode like this:

insert into t1 values(1,
2,
3);

I don't know, what effect this has to performace..

Regards,
Otto



----- Original Message -----
From: "Tom Lane" <tgl@sss.pgh.pa.us>
To: "Havasvölgyi Ottó" <h.otto@freemail.hu>
Cc: <pgsql-general@postgresql.org>
Sent: Wednesday, August 03, 2005 1:03 AM
Subject: Re: [GENERAL] feeding big script to psql


> =?iso-8859-2?Q?Havasv=F6lgyi_Ott=F3?= <h.otto@freemail.hu> writes:
>> Thanks for the suggestion. I have just applied both switch , -f (I have
>> applied this in the previous case too) and -n, but it becomes slow again.
>> At
>> the beginning it reads about 300 KB a second, and when it has read 1.5
>> MB,
>> it reads only about 10 KB a second, it slows down gradually. Maybe others
>> should also try this scenario. Can I help anything?
>
> Well, I don't see it happening here.  I made up a script consisting of a
> whole lot of repetitions of
>
> insert into t1 values(1,2,3);
>
> with one of these inserted every 1000 lines:
>
> \echo 1000 `date`
>
> so I could track the performance.  I created a table by hand:
>
> create table t1(f1 int, f2 int, f3 int);
>
> and then started the script with
>
> psql -q -f big.sql testdb
>
> At the beginning I was seeing about two echoes per second.  I let it run
> for an hour, and I was still seeing about two echoes per second.  That's
> something close to 170MB of script file read (over 5.7 million rows
> inserted by the time I stopped it).
>
> So, either this test case is too simple to expose your problem, or
> there's something platform-specific going on.  I don't have a windows
> machine to try it on ...
>
> regards, tom lane
>
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