154 lines
4.7 KiB
Ruby
Executable File
154 lines
4.7 KiB
Ruby
Executable File
#! /usr/bin/ruby
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#
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# Munin Plugin for SGA memory components monitoring
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#
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# Author: Wilfred Chau <openapp.developer@gmail.com>
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# Date: 2011-05-12
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# Version: 1.0
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License version 2
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# as published by the Free Software Foundation.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License along
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# with this program; if not, write to the Free Software Foundation, Inc.,
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# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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#
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#
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# Prerequistes:
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# 1) env.ORACLE_HOME set in munin-node
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# 2) rubygems
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# 3) oci8 - DBI gem for connecting to Oracle
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# * instruction of installing oci8 is available here:
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# http://ruby-oci8.rubyforge.org/en/InstallBinaryPackage.html
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#
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# Usage:
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# 1) copy this script to the munin install plugins directory (e.g. /usr/share/munin/plugins)
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# 2) chmod to allow executable to others
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# 3) create symbolic link in /etc/munin/plugins
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# ln -s /usr/share/munin/plugins/oracle_orcl_sga.rb /etc/munin/plugins/oracle_orcl_sga.rb
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#
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# Parameters:
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# autoconf
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# config (required)
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#
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# Configurable variables:
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# orauser : oracle user who has select privilege to query v$sgastat view
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# orapass : password for the oracle user
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# dbport : port used by the monitored instance (notice: numeric value)
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# dbname : database to be monitored
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# dbhost : host or ip address of db instance
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#
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#
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#%# family=auto
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#%# capabilities=autoconf
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require 'rubygems'
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require 'oci8'
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orauser = 'munin'
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orapass = 'munin'
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dbport = 1522
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dbname = 'orcl'
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dbhost = 'localhost'
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tnsname = "(DESCRIPTION =
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(ADDRESS = (PROTOCOL = TCP)(HOST = #{dbhost})(PORT = #{dbport}))
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(CONNECT_DATA = (SID = #{dbname})))"
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def runQuery (name,query)
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rows = $conn.exec(query)
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puts "#{name}.value #{rows.fetch().to_s}"
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rows.close
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end
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#
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# Queries
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#
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shared_pool_query = "SELECT TO_CHAR(ROUND(SUM(decode(pool, 'shared pool',
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decode(name, 'library cache',0,
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'dictionary chace',0,
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'free memory',0,
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'sql area',0,
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(bytes)/(1024*1024)),0)),2)) pool_misc
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from V$SGASTAT"
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buffer_cache_query = "SELECT TO_CHAR(ROUND(SUM(decode(pool,NULL,
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decode(name, 'db_block_buffers', (bytes)/(1024/1024),
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'buffer_cache',(bytes)/(1024*1024),0),0)),2)) sga_bufcache
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from V$SGASTAT"
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fixed_area_query = "SELECT TO_CHAR(ROUND(SUM(decode(pool,NULL,
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decode(name, 'fixed_sga', (bytes)/(1024*1024),0),0)),2)) sga_fixed
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from V$SGASTAT"
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java_pool_query = "SELECT TO_CHAR(ROUND(SUM(decode(pool, 'java pool', (bytes)/(1024*1024),0)),2)) sga_jpool
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from V$SGASTAT"
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large_pool_query = "SELECT TO_CHAR(ROUND(SUM(decode(pool, 'large pool', (bytes)/(1024*1024),0)),2)) sga_lpool
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from V$SGASTAT"
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log_buffer_query = "SELECT TO_CHAR(ROUND(SUM(decode(pool, NULL,
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decode(name, 'log_buffer', (bytes)/(1024*1024),0),0)),2)) sga_lbuffer
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from V$SGASTAT"
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memory_components = { "fixed_area" => fixed_area_query,
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"buffer_cache" => buffer_cache_query,
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"java_pool" => java_pool_query,
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"large_pool" => large_pool_query,
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"log_buffer" => log_buffer_query,
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"shared_pool" => shared_pool_query
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}
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#
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# autoconf
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#
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if ARGV[0] == "autoconf"
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if tnsname.length > 1 && orauser.length > 1 && orapass.length > 1
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puts "yes"
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else
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puts "no"
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puts "Usage: #{__FILE__} autoconf|conf"
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end
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exit 0
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#
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# config definition
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#
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elsif ARGV[0] == "config"
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puts "graph_args --base 1024k -r --lower-limit 0"
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puts "graph_title Oracle SGA from #{dbname}"
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puts "graph_category Oracle"
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puts "graph_info This graph shows the SGA memory usage (in MB)"
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puts "graph_vlabel MB"
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puts "graph_scale no"
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puts "graph_period second"
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memory_components.keys.each do |m|
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puts "#{m}.label #{m}"
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puts "#{m}.info SGA: #{m}"
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puts "#{m}.type GAUGE"
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# make sure fixed_area is at the bottom of the stack
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if ( m == 'fixed_area' )
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puts "#{m}.draw AREA"
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else
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puts "#{m}.draw STACK"
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end
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end
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exit 0
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end
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$conn = OCI8.new(orauser, orapass, tnsname)
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memory_components.each do |mc, query|
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runQuery(mc, query)
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end
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$conn.logoff
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