micro bench template

script/micro_bench.rb

@@ -0,0 +1,27 @@
+require 'benchmark/ips'
+require File.expand_path("../../config/environment", __FILE__)
+
+conn = ActiveRecord::Base.connection.raw_connection
+
+Benchmark.ips do |b|
+  b.report("simple") do
+    User.first.name
+  end
+
+  b.report("simple with select") do
+    User.select("name").first.name
+  end
+
+  b.report("pluck with first") do
+    User.pluck(:name).first
+  end
+
+  b.report("pluck with limit") do
+    User.limit(1).pluck(:name).first
+  end
+
+  b.report("raw") do
+    conn.exec("SELECT name FROM users LIMIT 1").getvalue(0,0)
+  end
+end
+