TPC-DS采用星型、雪花型等多维数据模式。它包含7张事实表，17张纬度表平均每张表含有18列。其工作负载包含99个SQL查询，覆盖SQL99和2003的核心部分以及OLAP。这个测试集包含对大数据集的统计、报表生成、联机查询、数据挖掘等复杂应用，测试用的数据和值是有倾斜的，与真实数据一致。TPC-DS是与真实场景非常接近的一个测试集，也是难度较大的一个测试集。
TPC-DS成为客观衡量多个不同Hadoop版本以及SQL on Hadoop技术的最佳测试集。这个基准测试有以下几个主要特点：
- 一共99个测试案例，遵循SQL’99和SQL 2003的语法标准，SQL案例比较复杂
- 分析的数据量大，并且测试案例是在回答真实的商业问题
- 测试案例中包含各种业务模型（如分析报告型，迭代式的联机分析型，数据挖掘型等）
- 几乎所有的测试案例都有很高的IO负载和CPU计算需求
hive-testbench提供了基于TPC-DS和TPC-H基准测试的数据生成器和示例查询。这里我们使用TPC-DS。
环境准备
从GitHub官网clone hive-testbench源码，Git地址如下：
https://github.com/hortonworks/hive-testbench.git
安装hive-testbench编译依赖环境
yum -y install gcc gcc-c++
编译并打包hive-testbench
在hive-testbench目录下执行如下脚本进行编译打包
./tpcds-build.sh
等待编译成功即可。
生成并加载数据
在hive-testbench目录下执行如下脚本生成并加载测试数据，生成数据的方式是向集群提交一个MapReduce作业
./tpcds-setup.sh 5
5表示生成的数据量大小GB单位，我们的测试集群规模比较小，这里先生成5G数据
后面可以跟一个数据生成的目录，目录不存在则自动生成，如果不指定数据目录则默认生成到tpcds-generate目录下。
有如上图显示则表示脚本执行成功
Hive查看生成的两个数据库tpcds_bin_partitioned_orc_5，tpcds_text_5
命令行查看HDFS上的数据是否与我们指定的量一致，各个表的大小
数据总量与指定5GB数据量一致
通过Hue验证生成的测试数据
使用Impala命令创建Parquet格式表
使用Impala命令将Hive 库中Text格式的表转换给Parquet格式的表，将tpcds_text_5库中所有表数据插入到对应Parquet格式的表中并对表执行分析
在cdp2.soundhearer.cn节点执行命令：
impala-shell -f ddl_impala_parquet.sql
SQL脚本如下
drop database if exists tpcds_parquet_5 cascade; create database tpcds_parquet_5; use tpcds_parquet_5; set parquet_file_size=512M; set COMPRESSION_CODEC=snappy; create table call_center like tpcds_text_5.call_center stored as parquetfile; create table catalog_page like tpcds_text_5.catalog_page stored as parquetfile; create table catalog_returns like tpcds_text_5.catalog_returns stored as parquetfile; create table catalog_sales like tpcds_text_5.catalog_sales stored as parquetfile; create table customer_address like tpcds_text_5.customer_address stored as parquetfile; create table customer_demographics like tpcds_text_5.customer_demographics stored as parquetfile; create table customer like tpcds_text_5.customer stored as parquetfile; create table date_dim like tpcds_text_5.date_dim stored as parquetfile; create table household_demographics like tpcds_text_5.household_demographics stored as parquetfile; create table income_band like tpcds_text_5.income_band stored as parquetfile; create table inventory like tpcds_text_5.inventory stored as parquetfile; create table item like tpcds_text_5.item stored as parquetfile; create table promotion like tpcds_text_5.promotion stored as parquetfile; create table reason like tpcds_text_5.reason stored as parquetfile; create table ship_mode like tpcds_text_5.ship_mode stored as parquetfile; create table store_returns like tpcds_text_5.store_returns stored as parquetfile; create table store_sales like tpcds_text_5.store_sales stored as parquetfile; create table store like tpcds_text_5.store stored as parquetfile; create table time_dim like tpcds_text_5.time_dim stored as parquetfile; create table warehouse like tpcds_text_5.warehouse stored as parquetfile; create table web_page like tpcds_text_5.web_page stored as parquetfile; create table web_returns like tpcds_text_5.web_returns stored as parquetfile; create table web_sales like tpcds_text_5.web_sales stored as parquetfile; create table web_site like tpcds_text_5.web_site stored as parquetfile; insert overwrite table call_center select * from tpcds_text_5.call_center; insert overwrite table catalog_page select * from tpcds_text_5.catalog_page; insert overwrite table catalog_returns select * from tpcds_text_5.catalog_returns; insert overwrite table catalog_sales select * from tpcds_text_5.catalog_sales; insert overwrite table customer_address select * from tpcds_text_5.customer_address; insert overwrite table customer_demographics select * from tpcds_text_5.customer_demographics; insert overwrite table customer select * from tpcds_text_5.customer; insert overwrite table date_dim select * from tpcds_text_5.date_dim; insert overwrite table household_demographics select * from tpcds_text_5.household_demographics; insert overwrite table income_band select * from tpcds_text_5.income_band; insert overwrite table inventory select * from tpcds_text_5.inventory; insert overwrite table item select * from tpcds_text_5.item; insert overwrite table promotion select * from tpcds_text_5.promotion; insert overwrite table reason select * from tpcds_text_5.reason; insert overwrite table ship_mode select * from tpcds_text_5.ship_mode; insert overwrite table store_returns select * from tpcds_text_5.store_returns; insert overwrite table store_sales select * from tpcds_text_5.store_sales; insert overwrite table store select * from tpcds_text_5.store; insert overwrite table time_dim select * from tpcds_text_5.time_dim; insert overwrite table warehouse select * from tpcds_text_5.warehouse; insert overwrite table web_page select * from tpcds_text_5.web_page; insert overwrite table web_returns select * from tpcds_text_5.web_returns; insert overwrite table web_sales select * from tpcds_text_5.web_sales; insert overwrite table web_site select * from tpcds_text_5.web_site; compute stats call_center ; compute stats catalog_page ; compute stats catalog_returns ; compute stats catalog_sales ; compute stats customer_address ; compute stats customer_demographics ; compute stats customer ; compute stats date_dim ; compute stats household_demographics ; compute stats income_band ; compute stats inventory ; compute stats item ; compute stats promotion ; compute stats reason ; compute stats ship_mode ; compute stats store_returns ; compute stats store_sales ; compute stats store ; compute stats time_dim ; compute stats warehouse ; compute stats web_page ; compute stats web_returns ; compute stats web_sales ; compute stats web_site ;
查看Impala表信息
