From fc51489285a7ca24966e05c9859a11b8c5efdb19 Mon Sep 17 00:00:00 2001
From: Wilfred Chau <openapp.developer@gmail.com>
Date: Fri, 3 Jun 2011 01:49:28 +0200
Subject: [PATCH] Initial version

---
 .../microsoft-sql-buffer-cache-hit-ratio      | 105 ++++++++++++++++++
 1 file changed, 105 insertions(+)
 create mode 100755 plugins/other/microsoft-sql-buffer-cache-hit-ratio

diff --git a/plugins/other/microsoft-sql-buffer-cache-hit-ratio b/plugins/other/microsoft-sql-buffer-cache-hit-ratio
new file mode 100755
index 00000000..866de817
--- /dev/null
+++ b/plugins/other/microsoft-sql-buffer-cache-hit-ratio
@@ -0,0 +1,105 @@
+#! /usr/bin/ruby
+#
+# Munin Plugin for MSSQL - Buffer cache hit ratio monitoring
+#
+# Author: Wilfred Chau <openapp.developer@gmail.com>
+# Date: 2011-05-19
+# 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) /etc/odbc.ini and /etc/freetds.conf
+#	2) rubygems
+#	3) ruby-dbi
+#
+# 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/mssql_buffercachehitratio.rb /etc/munin/plugins/mssql_buffercachehitratio.rb
+#
+# Parameters:
+#	autoconf
+#	config (required)
+#
+# Config variables:
+#	sqluser : mssql user who has view server state priviledge
+#	sqlpass : password for the mssql user
+#	dsn     : datasource name as defined in /etc/odbc.ini
+#
+#%# family=auto
+#%# capabilities=autoconf
+
+require 'rubygems'
+require 'dbi'
+
+sqluser  = 'rubyuser'
+sqlpass  = 'rubyuser'
+dsn      = 'TESTSQL'
+
+#
+# Queries
+#
+#
+dbh = DBI.connect("DBI:ODBC:#{dsn}",sqluser,sqlpass)
+
+buffercachehitratio_query = "select (a.cntr_value * 1.0 / b.cntr_value) * 100.0
+                            from sys.dm_os_performance_counters a
+                            join (select cntr_value, object_name
+                                  from sys.dm_os_performance_counters
+                                  where counter_name = 'Buffer cache hit ratio base'
+                                  and object_name = 'SQLServer:Buffer Manager') b
+                            on a.object_name = b.object_name
+                            where a.counter_name = 'Buffer cache hit ratio'
+                            and a.object_name = 'SQLServer:Buffer Manager'"
+
+#
+# autoconf
+#
+if ARGV[0] == "autoconf"
+	if all_instance_names.length > 1 && sqluser.length > 1 && sqlpass.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 1000 -r --lower-limit 0"	
+	puts "graph_title MSSQL Buffer Cache Hit Ratio "
+	puts "graph_category MSSQL"
+	puts "graph_info This graph shows Buffer Cache Hit Ratio"
+	puts "graph_vlabel %"
+	puts "graph_scale no"
+	puts "graph_period second"
+
+	puts "bc_hitratio.label BufferCacheHitRatio"
+	puts "bc_hitratio.info BufferCacheHitRatio"
+	puts "bc_hitratio.type GAUGE"
+	puts "bc_hitratio.draw LINE1"
+
+	exit 0
+end
+
+sth = dbh.execute(buffercachehitratio_query)
+sth.fetch do |row|
+	puts "bc_hitratio.value #{row[0].strip.to_s}"
+end
+sth.finish
+dbh.disconnect