Munin contributed plugins

#!/usr/bin/env ruby

#

# Munin Plugin for SGA memory components monitoring

#

# Author: Wilfred Chau <openapp.developer@gmail.com>

# Date: 2011-05-12

# Version: 1.0

#

# This program is free software; you can redistribute it and/or modify

# it under the terms of the GNU General Public License version 2

# as published by the Free Software Foundation.

#

# 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.

#

#

# Prerequistes:

#	1) env.ORACLE_HOME set in munin-node

#	2) rubygems

#	3) oci8 - DBI gem for connecting to Oracle

#	   * instruction of installing oci8 is available here:

#	     http://ruby-oci8.rubyforge.org/en/InstallBinaryPackage.html

#

# Usage:

#	1) copy this script to the munin install plugins directory (e.g. /usr/share/munin/plugins)

#	2) chmod to allow executable to others

#	3) create symbolic link in /etc/munin/plugins

#          ln -s /usr/share/munin/plugins/oracle_orcl_sga.rb /etc/munin/plugins/oracle_orcl_sga.rb

#

# Parameters:

#	autoconf

#	config (required)

#

# Configurable variables:

#	orauser : oracle user who has select privilege to query v$sgastat view

#	orapass : password for the oracle user

#	dbport  : port used by the monitored instance (notice: numeric value)

#	dbname  : database to be monitored

#	dbhost  : host or ip address of db instance

#

#

#%# family=auto

#%# capabilities=autoconf

require 'rubygems'

require 'oci8'

orauser  = 'munin'

orapass  = 'munin'

dbport   = 1522

dbname   = 'orcl'

dbhost   = 'localhost'

tnsname  = "(DESCRIPTION =

            (ADDRESS = (PROTOCOL = TCP)(HOST = #{dbhost})(PORT = #{dbport}))

            (CONNECT_DATA = (SID = #{dbname})))"

def runQuery (name,query)

	rows = $conn.exec(query)

	puts "#{name}.value #{rows.fetch().to_s}"

        rows.close

end

#

# Queries

#

shared_pool_query = "SELECT TO_CHAR(ROUND(SUM(decode(pool, 'shared pool',

                    decode(name, 'library cache',0,

                                 'dictionary chace',0,

                                 'free memory',0,

                                 'sql area',0,

                                 (bytes)/(1024*1024)),0)),2)) pool_misc

                    from V$SGASTAT"

buffer_cache_query = "SELECT TO_CHAR(ROUND(SUM(decode(pool,NULL,

                     decode(name, 'db_block_buffers', (bytes)/(1024/1024),

                            'buffer_cache',(bytes)/(1024*1024),0),0)),2)) sga_bufcache

                     from V$SGASTAT"

fixed_area_query = "SELECT TO_CHAR(ROUND(SUM(decode(pool,NULL,

                   decode(name, 'fixed_sga', (bytes)/(1024*1024),0),0)),2)) sga_fixed

                   from V$SGASTAT"

java_pool_query = "SELECT TO_CHAR(ROUND(SUM(decode(pool, 'java pool', (bytes)/(1024*1024),0)),2)) sga_jpool

                   from V$SGASTAT"

large_pool_query = "SELECT TO_CHAR(ROUND(SUM(decode(pool, 'large pool', (bytes)/(1024*1024),0)),2)) sga_lpool

                   from V$SGASTAT"

log_buffer_query = "SELECT TO_CHAR(ROUND(SUM(decode(pool, NULL,

                   decode(name, 'log_buffer', (bytes)/(1024*1024),0),0)),2)) sga_lbuffer

                   from V$SGASTAT"

memory_components = { "fixed_area"   => fixed_area_query,

                      "buffer_cache" => buffer_cache_query,

                      "java_pool"    => java_pool_query,

                      "large_pool"   => large_pool_query,

                      "log_buffer"   => log_buffer_query,

                      "shared_pool"  => shared_pool_query

                     }

#

# autoconf

#

if ARGV[0] == "autoconf"

	if tnsname.length > 1 && orauser.length > 1 && orapass.length > 1

		puts "yes"

	else

		puts "no"

		puts "Usage: #{__FILE__} autoconf|conf"

	end

	exit 0

#

# config definition

#

elsif ARGV[0] == "config"

	puts "graph_args --base 1024k -r --lower-limit 0"

	puts "graph_title Oracle SGA from #{dbname}"

	puts "graph_category db"

	puts "graph_info This graph shows the SGA memory usage (in MB)"

	puts "graph_vlabel MB"

	puts "graph_scale no"

	puts "graph_period second"

	memory_components.keys.each do |m|

		puts "#{m}.label #{m}"

		puts "#{m}.info SGA: #{m}"

		puts "#{m}.type GAUGE"

		# make sure fixed_area is at the bottom of the stack

		if ( m ==  'fixed_area' )

	        	puts "#{m}.draw AREA"

		else

                	puts "#{m}.draw STACK"

		end

	end

	exit 0

end

$conn = OCI8.new(orauser, orapass, tnsname)

memory_components.each do |mc, query|

	runQuery(mc, query)

end

$conn.logoff