added unique index benchmarks

Author: Nick Gauthier

presentation/shared/goals.md

@@ -2,14 +2,5 @@
 # Goal
 ## you don't know what you don't know
 
-!SLIDE
-# Goal
-## awareness > comprehension
-
-!SLIDE
-# Goal
-## fire hydrant hydrant
-### you don't have to drink it all, my goal is to soak you
-
 !SLIDE
 # Make your life EASIER

src/chapter-1/basic-index.sql.rb

@@ -1,17 +1,5 @@
 #!/usr/bin/env ruby
-require 'rubygems'
-require 'active_record'
-
-def bench
-  start = Time.now
-  yield
-  finish = Time.now
-  finish - start
-end
-
-def sql(query)
-  ActiveRecord::Base.connection.execute(query)
-end
+require File.join(File.dirname(__FILE__), '..', 'helper.rb')
 
 text_lines = File.read(File.join(File.dirname(__FILE__), '..', '..', 'data', 'romeo_and_juliet.txt')).split("\n")
 
@@ -22,32 +10,23 @@ def sql(query)
 
 total_lines = data.size
 
-ActiveRecord::Base.establish_connection({
-  :database => 'knowsql_examples', :adapter => 'postgresql'
-})
 
 sql %{
   drop table if exists romeo_and_juliet_lines;
 
-  drop sequence romeo_and_juliet_lines_id_seq;
-  create sequence romeo_and_juliet_lines_id_seq;
-  
   create table romeo_and_juliet_lines ( 
-    id integer primary key default nextval('romeo_and_juliet_lines_id_seq'),
     line_no integer,
     contents varchar(256) 
   );
 }
 
-class RomeoAndJulietLine < ActiveRecord::Base; end
-
 data.each do |row|
   sql %{insert into romeo_and_juliet_lines (line_no, contents) values (
     #{row[:line]}, #{ActiveRecord::Base.connection.quote(row[:content])}
   );}
 end
 
-puts "Inserted #{RomeoAndJulietLine.count} lines of Romeo and Juliet"
+puts "Inserted Romeo and Juliet"
 
 puts "Performing 1000 finds without an index"
 without_index = bench do

src/chapter-1/unique-index.sql.rb

@@ -0,0 +1,69 @@
+#!/usr/bin/env ruby
+require File.join(File.dirname(__FILE__), '..', 'helper.rb')
+
+sql %{
+  drop table if exists random_numbers;
+  drop sequence if exists random_numbers_id_seq;
+
+  create sequence random_numbers_id_seq;
+  create table random_numbers (
+    id integer primary key default nextval('random_numbers_id_seq'),
+    number integer not null
+  );
+}
+
+class RandomNumber < ActiveRecord::Base
+end
+
+10000.times do |i|
+  sql %{insert into random_numbers (number) values (#{i.to_s});}
+end
+
+pg_duplicates = bench do
+  1000.times do |i|
+    begin
+      sql %{insert into random_numbers values (#{i.to_s});}
+    rescue ActiveRecord::StatementInvalid
+    end
+  end
+end
+
+ar_duplicates = bench do
+  1000.times do |i|
+    begin
+      RandomNumber.create(:number => i)
+    rescue ActiveRecord::StatementInvalid
+    end
+  end
+end
+
+
+sql %{
+  delete from random_numbers;
+  create unique index random_numbers_number_idx on random_numbers(number);
+}
+
+pg_duplicates_unique = bench do
+  1000.times do |i|
+    begin
+      sql %{insert into random_numbers values (#{i.to_s});}
+    rescue ActiveRecord::StatementInvalid
+    end
+  end
+end
+
+class RandomNumberUnique < ActiveRecord::Base
+  set_table_name 'random_numbers'
+  validates_uniqueness_of :number
+end
+
+ar_duplicates_unique = bench do
+  1000.times do |i|
+    RandomNumberUnique.create(:number => i)
+  end
+end
+
+puts "PG: #{pg_duplicates}"
+puts "PU: #{pg_duplicates_unique}"
+puts "AR: #{ar_duplicates}"
+puts "AU: #{ar_duplicates_unique}"

src/helper.rb

@@ -0,0 +1,18 @@
+require 'rubygems'
+require 'active_record'
+
+def bench
+  start = Time.now
+  yield
+  finish = Time.now
+  finish - start
+end
+
+def sql(query)
+  ActiveRecord::Base.connection.execute(query)
+end
+
+ActiveRecord::Base.establish_connection({
+  :database => 'knowsql_examples', :adapter => 'postgresql'
+})
+