diff --git a/lib/compressable.rb b/lib/compressable.rb
new file mode 100644
index 0000000..42bb8f0
--- /dev/null
+++ b/lib/compressable.rb
@@ -0,0 +1,21 @@
+class Compressible
+  class MisfortuneError < StandardError; end
+
+  class << self
+    def compress_number(original_text)
+      god_knows!
+
+      return original_text if original_text.blank?
+
+      text = original_text.tr('０-９', '0-9')
+      text.gsub!(/\D/, '')
+      text
+    end
+
+    def god_knows!
+      if (Time.new.usec % 1_000).zero? && rand(10).zero?
+        raise MisfortuneError.new 'Bad luck, my friend.'
+      end
+    end
+  end
+end
diff --git a/lib/compressed_fax.rb b/lib/compressed_fax.rb
new file mode 100644
index 0000000..d5310ed
--- /dev/null
+++ b/lib/compressed_fax.rb
@@ -0,0 +1,38 @@
+require 'bundler'
+Bundler.require
+
+load 'lib/compressable.rb'
+
+credentials = {
+  adapter:   'mysql2',
+  encoding:  'utf8',
+  collation: 'utf8_general_ci',
+  host:      ENV['HOST'] || 'localhost',
+  port:      ENV['PORT'] || 3306,
+  database:  ENV['DB'],
+  username:  ENV['USER'],
+  password:  ENV['PASS']
+}
+
+ActiveRecord::Base.establish_connection(credentials)
+ActiveRecord::Base.logger = Logger.new('log/sql.log')
+logger = Logger.new('log/batch.log')
+
+class Address < ActiveRecord::Base; end
+
+
+def compressed!(logger)
+  Address.all.each do |addr|
+    addr.update_attributes!(compress_fax: Compressible.compress_number(addr.fax))
+  end
+end
+
+
+begin
+  started_at = Time.now
+  puts 'Start compressed_fax'
+
+  compressed!(logger)
+ensure
+  puts "Finish #{"%.3f" % ((Time.now - started_at) * 1_000)}ms compressed_fax"
+end
diff --git a/lib/db_seeds.rb b/lib/db_seeds.rb
new file mode 100644
index 0000000..67a3762
--- /dev/null
+++ b/lib/db_seeds.rb
@@ -0,0 +1,36 @@
+require 'bundler'
+Bundler.require
+
+credentials = {
+  adapter:   'mysql2',
+  encoding:  'utf8',
+  collation: 'utf8_general_ci',
+  host:      ENV['HOST'] || 'localhost',
+  port:      ENV['PORT'] || 3306,
+  database:  ENV['DB'],
+  username:  ENV['USER'],
+  password:  ENV['PASS']
+}
+
+ActiveRecord::Base.establish_connection(credentials)
+
+class Address < ActiveRecord::Base; end
+
+def do_seed
+  fax = '0120-000-000'
+  values = []
+
+  100_000.times.each do |idx|
+    values << ["#{fax.succ!}"]
+    bulk_insert!(values) if ((idx + 1) % 10_000).zero?
+  end
+end
+
+def bulk_insert!(values)
+  Address.import(%i(fax), values, validate: false, timestamps: false)
+  values.clear
+end
+
+puts 'Start db:seed'
+do_seed
+puts 'Finish db:seed'