create_model_storage (DataMapper::Migrations::OracleAdapter)

    # File lib/dm-core/migrations.rb, line 890
          def create_model_storage(model)
            properties = model.properties_with_subclasses(name)
            table_name = model.storage_name(name)
            truncate_or_delete = self.class.auto_migrate_with
            table_is_truncated = truncate_or_delete && @truncated_tables && @truncated_tables[table_name]

            return false if storage_exists?(table_name) && !table_is_truncated
            return false if properties.empty?

            with_connection do |connection|
              # if table was truncated then check if all columns for properties are present
              # TODO: check all other column definition options
              if table_is_truncated && storage_has_all_fields?(table_name, properties)
                @truncated_tables[table_name] = nil
              else
                # forced drop of table if properties are different
                if truncate_or_delete
                  destroy_model_storage(model, true)
                end

                statement = create_table_statement(connection, model, properties)
                command   = connection.create_command(statement)
                command.execute_non_query

                (create_index_statements(model) + create_unique_index_statements(model)).each do |statement|
                  command   = connection.create_command(statement)
                  command.execute_non_query
                end

                # added creation of sequence
                create_sequence_statements(model).each do |statement|
                  command   = connection.create_command(statement)
                  command.execute_non_query
                end
              end

            end

            true
          end