diff --git a/plugins/other/oracle-sga b/plugins/other/oracle-sga
new file mode 100755
index 00000000..7bbccc80
--- /dev/null
+++ b/plugins/other/oracle-sga
@@ -0,0 +1,153 @@
+#! /usr/bin/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 priviledge 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$SGASTAT" 
+
+
+memory_components = { "fixed_area"   => fixed_area_query,
+                      "buffer_cache" => buffer_cache_query,
+                      "java_pool"    => java_pool_query,
+                      "large_pool"   => large_pool_query,
+                      "log_buffer"   => log_buffer_query,
+                      "shared_pool"  => shared_pool_query
+                     }
+
+#
+# autoconf
+#
+if ARGV[0] == "autoconf"
+	if tnsname.length > 1 && orauser.length > 1 && orapass.length > 1
+		puts "yes"
+	else
+		puts "no"
+		puts "Usage: #{__FILE__} autoconf|conf"
+	end
+	exit 0
+#
+# config definition
+#
+elsif ARGV[0] == "config"
+	puts "graph_args --base 1024k -r --lower-limit 0"	
+	puts "graph_title Oracle SGA from #{dbname}"
+	puts "graph_category Oracle"
+	puts "graph_info This graph shows the SGA memory usage (in MB)"
+	puts "graph_vlabel MB"
+	puts "graph_scale no"
+	puts "graph_period second"
+
+	memory_components.keys.each do |m|
+		puts "#{m}.label #{m}"
+		puts "#{m}.info SGA: #{m}"
+		puts "#{m}.type GAUGE"
+
+		# make sure fixed_area is at the bottom of the stack
+		if ( m ==  'fixed_area' )
+	        	puts "#{m}.draw AREA"
+		else	
+                	puts "#{m}.draw STACK"
+		end
+	end
+
+	exit 0
+end
+
+$conn = OCI8.new(orauser, orapass, tnsname)
+memory_components.each do |mc, query|
+	runQuery(mc, query)
+end
+$conn.logoff