* Add benchmarks for storage engines

benchmarks/storage_engines.benchmark

@@ -0,0 +1,10 @@
+-- create_table(:innodb, {:force=>true, :options=>"ENGINE=InnoDB"})
+   -> 0.0237s
+-- create_table(:myisam, {:force=>true, :options=>"ENGINE=MyISAM"})
+   -> 0.0030s
+-- create_table(:archive, {:force=>true, :options=>"ENGINE=Archive"})
+   -> 0.0029s
+      user     system      total        real
+inserts with innodb storage engine  9.240000   0.870000  10.110000 ( 18.102314)
+inserts with myisam storage engine  5.890000   0.490000   6.380000 (  8.401665)
+inserts with archive storage engine  5.900000   0.480000   6.380000 (  8.426003)

benchmarks/storage_engines.rb

@@ -0,0 +1,64 @@
+require "rubygems"
+require "benchmark"
+require "active_support"
+require "active_record"
+
+TIMES = 10_000
+
+ActiveRecord::Base.establish_connection({ 
+  :adapter => 'mysql',
+  :database  => 'query_analyzer_test',
+  :user => "root",
+  :password => ""
+})
+
+ActiveRecord::Schema.define do  
+
+  create_table :innodb, :force => true, :options => 'ENGINE=InnoDB' do |t|
+    t.string :foo
+  end
+
+  create_table :myisam, :force => true, :options => 'ENGINE=MyISAM' do |t|
+    t.string :foo
+  end
+
+  create_table :archive, :force => true, :options => 'ENGINE=Archive' do |t|
+    t.string :foo
+  end
+
+end
+
+class InnoDB < ActiveRecord::Base
+  set_table_name :innodb
+end
+
+class MyISAM < ActiveRecord::Base
+  set_table_name :myisam
+end
+
+class Archive < ActiveRecord::Base
+  set_table_name :archive
+end
+
+class String
+  def self.random(length=10)
+    chars = ("a".."z").to_a
+    string = ""
+    1.upto(length) { |i| string << chars[rand(chars.size-1)]}
+    return string
+  end
+end
+
+Benchmark.bm do |b|
+  b.report "inserts with innodb storage engine" do
+    TIMES.times { InnoDB.create!(:foo => String.random) }
+  end
+
+  b.report "inserts with myisam storage engine" do 
+    TIMES.times { MyISAM.create!(:foo => String.random) }
+  end
+
+  b.report "inserts with archive storage engine" do
+    TIMES.times { Archive.create!(:foo => String.random) }
+  end
+end