From: Rajesh Kumar Mallah <mallah.rajesh@gmail.com>
To: Jens Schipkowski <jens.schipkowski@apus.co.at>
Cc: pgsql-performance@postgresql.org
Subject: Re: really quick multiple inserts can use COPY?
Date: Mon, 11 Dec 2006 22:31:08 +0530
Message-ID: <a97c77030612110901j3e826675o56e23dfd175ddce4@mail.gmail.com> (raw)
In-Reply-To: <op.tkekypo381rjf6@xjens.apus.local>
References: <op.tkekypo381rjf6@xjens.apus.local>
> So, my questions:
> Is it possible to use COPY FROM STDIN with JDBC?
Should be. Its at least possible using DBI and DBD::Pg (perl)
my $copy_sth = $dbh -> prepare( "COPY
general.datamining_mailing_lists (query_id,email_key) FROM STDIN;") ;
$copy_sth -> execute();
while (my ($email_key ) = $fetch_sth -> fetchrow_array ()) {
$dbh -> func("$query_id\t$email_key\n", 'putline');
}
$fetch_sth -> finish();
$dbh -> func("\\.\n", 'putline');
$dbh -> func('endcopy');
$copy_sth->finish();
Some JDBC expert would tell better how its done with JDBC.
> Will it bring performance improvement compared to SELECT UNION solution?
COPY is quite faast.
Regds
mallah.
>
> many thanks in advance,
> Jens Schipkowski
>
> --
> **
> APUS Software GmbH
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To: pgsql-performance@postgresql.org
Cc: mallah.rajesh@gmail.com, jens.schipkowski@apus.co.at
Subject: Re: really quick multiple inserts can use COPY?
In-Reply-To: <a97c77030612110901j3e826675o56e23dfd175ddce4@mail.gmail.com>
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