misc/postgres_relation_size_ at master · acunote/misc · GitHub

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#!/usr/bin/perl
# -*- cperl -*-
#
# Copyright (C) 2009 Magnus Hagander, Redpill Linpro AB
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; version 2 dated June,
# 1991.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
# 02110-1301 USA.

=head1 NAME

postgres_relation_size_ - Plugin to monitor PostgreSQL table and
index sizes.

=head1 CONFIGURATION

Configuration is done through libpq environment variables, for example
PGUSER, PGDATABASE, etc. For more information, see L<Munin::Plugin::Pgsql>.

In addition number of top relations to show is also configurable, with
the default being 20:

  [postgres_relation_size_]
     env.limit 20

To monitor a specific database, link to postgres_relation_size_<databasename>.

=head1 SEE ALSO

L<Munin::Plugin::Pgsql>

=head1 MAGIC MARKERS

 #%# family=auto
 #%# capabilities=autoconf suggest

=head1 AUTHOR

Gleb Arshinov <gleb+munin@pluron.com>, Pluron, Inc.

=head1 COPYRIGHT/License.

Copyright (c) 2011 Pluron, Inc.

All rights reserved. This program is free software; you can
redistribute it and/or modify it under the terms of the GNU General
Public License as published by the Free Software Foundation; version 2
dated June, 1991.

=cut

use strict;
use warnings;

use Munin::Plugin::Pgsql;

my $limit = $ENV{limit} || 20;

my $pg = Munin::Plugin::Pgsql->new(
    minversion => 8.1,
    basename  => 'postgres_relation_size_',
    title     => 'PostgreSQL relation size',
    info      => "Size of $limit largest relations (tables and indexes)",
    vlabel    => 'Size',
    basequery =>
      " SELECT relation, size"
      . " FROM ("
      . "   SELECT pg_namespace.nspname || '.' || pg_class.relname AS relation,"
      . "          pg_relation_size(pg_class.oid) AS size"
      . "   FROM pg_class"
      . "        LEFT JOIN pg_namespace"
      . "                  ON (pg_namespace.oid = pg_class.relnamespace)"
      . "   WHERE pg_namespace.nspname NOT IN ('pg_catalog',"
      . "                                      'information_schema')"
      . "   ORDER BY pg_relation_size(pg_class.oid) DESC"
      . "   LIMIT $limit"
      . " ) top_relations"
      . " UNION ALL"
      . "  SELECT 'all remaining' AS relation,"
      . "         SUM(remaining_relations.size) AS size"
      . "    FROM ( SELECT relname, pg_relation_size(pg_class.oid) as size"
      . "           FROM pg_class "
      . "           ORDER BY pg_relation_size(pg_class.oid) DESC"
      . "           OFFSET $limit ) remaining_relations",
    paramdatabase => 1,
    configquery    =>
      " SELECT relation, relation"
      . " FROM ("
      . "   SELECT pg_namespace.nspname || '.' || pg_class.relname AS relation"
      . "   FROM pg_class"
      . "        LEFT JOIN pg_namespace"
      . "                  ON (pg_namespace.oid = pg_class.relnamespace)"
      . "   WHERE pg_namespace.nspname NOT IN ('pg_catalog',"
      . "                                      'information_schema')"
      . "   ORDER BY pg_relation_size(pg_class.oid) DESC"
      . "   LIMIT $limit"
      . " ) top_relations"
      . " UNION ALL"
      . "  SELECT 'all remaining' AS relation,"
      . "         'all remaining' AS relation",
    suggestquery =>
        "SELECT datname FROM pg_database WHERE datallowconn AND NOT datistemplate AND NOT datname='postgres' ORDER BY 1 LIMIT 10",
    graphdraw => 'AREA',
    graphmin => 0,
    stack     => 1,
    base      => 1024
);

$pg->Process();
exit(0);

# Queries based on:
# http://wiki.postgresql.org/wiki/Disk_Usage