Re: Please help - tks

Much too quick and dirty. With 300,000 updates this will take 1.5million
seconds, roughly 200 days. Even at a rate of 1 a second it will take
nearly four days. All this aside, I would probably use a perl script and
do batches of about 10-20, with a sleep. You can try something like the
following and feed it using standard input. Please NOTE, I didn't test
this, and even if I did, you shouldn't trust me :).

- brian

Wm. Brian McCane | Life is full of doors that won't open
Search http://recall.maxbaud.net/ | when you knock, equally spaced amid those
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#! /usr/bin/perl

use strict ;

my @updates ;

while (my $line = <STDIN>)
{
my $cmd = "UPDATE table SET ......." ; # Use the line we just read
push(@updates, $cmd) ;
if (@updates == 10)
{
do_update() ;
sleep 5 ;
@updates = () ; # Redundant
}
}
do_update if (@updates) ;

sub do_update
{
open PSQL, "| psql dbname" ;
print PSQL "begin transaction ;\n" ;
while (my $cmd = shift @updates)
{
print PSQL $cmd . "\n" ;
}
print PSQL "commit ;\n" ;
close PSQL ;
}

__END__

On Thu, 18 Oct 2001, Brett Schwarz wrote:

> A quick and dirty solution would be something like (untested):
>
> while read line; do
> psql dbname -c "update table ... use 'line' as your id and data"
> sleep 5
> done < filename
>
> where "filename" is the file with the ids in it. "dbname" is the name of your DB (of course!)
>
> I am not sure what your file looks like, but you can do something like this. It could be easy, or harder, depending on what your file has.
>
> adjust the sleep to your own specs.
>
> --brett
>
>
> P.S.
>
> You could test this out by doing:
>
> while read line; do
> psql dbname -c "select * from table where id=$line"
> sleep 5
> done < filename
>
>
>
> On Thu, 18 Oct 2001 16:35:01 +1000 (EST)
> Mr OCP <mr_ocp(at)yahoo(dot)com> wrote:
>
> > Hi Folks
> >
> > We have about 300,000 records to update, I have
> > created a file with the ids of the records to be
> > updated, since the number of records to be updated is
> > very large, the update statement takes forever and
> > server slows down dramatically, therefore I want to do
> > one at a time.
> >
> > Do you guys have any script which may update records
> > one by one using the file that lists these records. I
> > am running postgresql sever under Unix, any kind of
> > script would do, whether its a perl, bash or sql
> > whatever script
> >
> > Thanks for your help
> > Mike
> >
> > http://briefcase.yahoo.com.au - Yahoo! Briefcase
> > - Manage your files online.
> >
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