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contrib-munin/plugins/postgresql/postgresql_database_ratio

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#!/bin/bash
#
# Plugin to monitor PostgreSQL Database Ratios (blocks read X blocks hit)
#
# Author:
# Guilherme Augusto da Rocha Silva <gars.dba@gmail.com>
#
# Created:
# 5th of november 2007
#
# Usage:
# Place in /etc/munin/plugins/ (or link it there using ln -s)
#
# Parameters:
# config (required)
#
# General info:
# Require permission for database access and read (no writes are processed).
# Recommended user is PostgreSQL database owner (default: postgres).
#
# Log info:
# 2007/11/30 - Review on comments
#
dbserver='localhost'
dbuser='postgres'
if [ "$1" = "config" ]; then
echo 'graph_args --base 1000 --lower-limit 0 --upper-limit 100'
echo 'graph_category db'
echo 'graph_info Shows each database read/hit (%) on the PostgreSQL Server.'
echo 'graph_scale no'
echo 'graph_title PostgreSQL Database Hit/Read Ratios'
echo 'graph_vlabel % of blocks read and hits'
psql -h ${dbserver} -U ${dbuser} -tc "SELECT datname FROM pg_stat_database WHERE datname != 'template0' ORDER BY 1;" | while read name
do
test -z "${name}" && continue
echo ${name}'.label '${name}
echo ${name}'.type GAUGE'
echo ${name}'.min 0'
echo ${name}'.max 100'
if [ "${name}" == "template0" ]; then
echo ${name}'.info PostgreSQL template database.'
elif [ "${name}" == "template1" ]; then
echo ${name}'.info PostgreSQL and/or user template database.'
elif [ "${name}" == "postgres" ]; then
echo ${name}'.info User postgres database.'
else
echo ${name}'.info User defined database.'
echo ${name}'.critical 50:min'
echo ${name}'.warning 75:min'
fi
done
exit 0
fi
psql -h ${dbserver} -U ${dbuser} -tc "SELECT datname||'.value '||(CASE WHEN (blks_hit > 0) THEN ROUND((blks_hit::NUMERIC / (blks_hit + blks_read)::NUMERIC) * 100, 2) ELSE 0 END)::TEXT FROM pg_stat_database WHERE datname != 'template0' ORDER BY datname;"