Message-ID: <1114.219.65.253.113.1048264331.squirrel@mail.trade-india.com>
Date: Fri, 21 Mar 2003 22:02:11 +0530 (IST)
Subject: Re: explain
From: <mallah@trade-india.com>
To: <pmarian@cnlo.ro>
Importance: Normal
Cc: <pgsql-sql@postgresql.org>
MIME-Version: 1.0
Content-Type: text/plain; charset=iso-8859-1
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Popeanga  ,

Its basically possible to get the info programatically.
see below is an example perl code that is getting the
plan data:

############### file test.pl #################

#!/usr/bin/perl

use DBI;
$dbh = DBI->connect('dbi:Pg:dbname=rmallah' , '','');
$your_query_here= 'select * from test';
$rows = $dbh -> selectall_arrayref("EXPLAIN ANALYZE $your_query_here");
foreach (@$rows) {
        print "$_->[0]\n";
}
$dbh -> disconnect();
#############################################

on running you get:

[rmallah@subho rmallah]$ ./test.pl
Seq Scan on test  (cost=0.00..20.00 rows=1000 width=32) (actual time=0.02..0.05 rows=11 loops=1)
Total runtime: 0.19 msec

But be careful abt explain analyzing
queries that potentially modify data. (read more on docs of EXPLAIN)
we have to put the explain analyze in a transaction block which
shud eventually be rollbacked.

now that you have seen how to get lines of output from EXPLAIN using/hadling this
data is upto you application.

also note that the last like of EXPLAIN analyze carries  the runtime.

hope it helps
Mallah.


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