http://docs.aws.amazon.com/AWSRubySDK/latest/AWS/DynamoDB/Client/V20120810.html#create_table-instance_method

gistfile1.rb

#-*- encoding: utf-8
require "aws-sdk"
require "./helpers.rb"

db = dynamodb_client(:tokyo)
db.client.create_table(
  :table_name => "test",
  :attribute_definitions => [
    {:attribute_name => "name", :attribute_type => "S"},
    {:attribute_name => "number", :attribute_type => "N"},
    {:attribute_name => "comment", :attribute_type => "S"}
  ],
  :key_schema => [
    {:attribute_name => "number", :key_type => "HASH"},
    {:attribute_name => "name", :key_type => "RANGE"}
  ],
  :global_secondary_indexes => [
    {:index_name => "name-number-global-index"},
    {:key_schema => [
      {:attribute_name => "name", :key_type => "HASH"},
      {:attribute_name => "number", :key_type => "RANGE"}
    ]},
    {:projection => {:projection_type => "ALL"}},
    {:provisioned_throughput => {
      :read_capacity_units => 1,
      :write_capacity_units => 1}
    }
  ],
  :provisioned_throughput => {
    :read_capacity_units => 1,
    :write_capacity_units => 1
  }
)