Sample Data: TPC-DS¶
As described in the TPC Benchmark™ DS (TPC-DS) specification:
“TPC-DS models the decision support functions of a retail product supplier. The supporting schema contains vital business information, such as customer, order, and product data.
In order to address the enormous range of query types and user behaviors encountered by a decision support system, TPC-DS utilizes a generalized query model. This model allows the benchmark to capture important aspects of the interactive, iterative nature of on-line analytical processing (OLAP) queries, the longer-running complex queries of data mining and knowledge discovery, and the more planned behavior of well known report queries.”
In this Topic:
Database and Schemas¶
Snowflake provides both 10TB and 100TB versions of TPC-DS, in schemas named TPCDS_SF10TCL and TPCDS_SF100TCL, respectively, within the SNOWFLAKE_SAMPLE_DATA shared database.
Database Entities, Relationships, and Characteristics¶
TPC-DS consists of 7 fact tables and 17 dimensions in the following schemas:
- TPCDS_SF100TCL: The 100TB (scale factor 100,000) version represents 100 million customers and over 500,000 items stored, with sales data spanning 3 channels – stores, catalogs, and the web – covering a period of 5 years. The largest table, STORE_SALES, contains nearly 300 billion rows, and the fact tables contain over 560 billion rows in total.
- TPCDS_SF10TCL: The 10TB (scale factor 10,000) version represents 65 million customers and over 400,000 items stored, with sales data spanning 3 channels – stores, catalogs, and the web – covering a period of 5 years. The largest table, STORE_SALES, contains nearly 29 billion rows, and the fact tables contain over 56 billion rows in total.
The relationships between facts and dimensions are represented through joins on surrogate keys. The detailed relationships are too numerous to display here, but can be found in the TPC-DS specification.
TPC-DS contains a set of 99 queries with wide variation in complexity and range of data scanned. Each TPC-DS query asks a business question and includes the corresponding query to answer the question. We have generated samples of all 99 TPC-DS queries for you to explore. Alternatively, you can use the tools in the TPC-DS Benchmark Kit to generate many different versions of these queries that vary by parameter values.
For the 10TB version, the full set of 99 TPC-DS queries should complete in well under 2 hours using a Snowflake 2X-Large warehouse. If you use the 100TB version, queries will complete in roughly 3 hours using a 4X-Large warehouse.
Below, we describe just one of the queries. More information about TPC-DS and all the queries involved can be found in the official TPC-DS specification.
Q57: Catalog Sales Call Center Outliers¶
This query looks at a year’s worth of CATALOG_SALES table data and reveals the categories and brands where sales in a month vary more than 10% from average for a given call center.
Find the item brands and categories for each call center and their monthly sales figures for a specified year, where the monthly sales figure deviated more than 10% of the average monthly sales for the year, sorted by deviation and call center. Report the sales deviation from the previous and following months.
Functional Query Definition¶
The query lists the following totals:
- Extended price
- Discounted extended price
- Discounted extended price plus tax
- Average quantity
- Average extended price
- Average discount
These aggregates are grouped by RETURNFLAG and LINESTATUS and are listed in ascending order of RETURNFLAG and LINESTATUS. A count of the number of line items in each group is included:
use schema snowflake_sample_data.tpcds_sf10Tcl; -- QID=TPC-DS_query57 with v1 as( select i_category, i_brand, cc_name, d_year, d_moy, sum(cs_sales_price) sum_sales, avg(sum(cs_sales_price)) over (partition by i_category, i_brand, cc_name, d_year) avg_monthly_sales, rank() over (partition by i_category, i_brand, cc_name order by d_year, d_moy) rn from item, catalog_sales, date_dim, call_center where cs_item_sk = i_item_sk and cs_sold_date_sk = d_date_sk and cc_call_center_sk= cs_call_center_sk and ( d_year = 1999 or ( d_year = 1999-1 and d_moy =12) or ( d_year = 1999+1 and d_moy =1) ) group by i_category, i_brand, cc_name , d_year, d_moy), v2 as( select v1.i_category ,v1.d_year, v1.d_moy ,v1.avg_monthly_sales ,v1.sum_sales, v1_lag.sum_sales psum, v1_lead.sum_sales nsum from v1, v1 v1_lag, v1 v1_lead where v1.i_category = v1_lag.i_category and v1.i_category = v1_lead.i_category and v1.i_brand = v1_lag.i_brand and v1.i_brand = v1_lead.i_brand and v1.cc_name = v1_lag.cc_name and v1.cc_name = v1_lead.cc_name and v1.rn = v1_lag.rn + 1 and v1.rn = v1_lead.rn - 1) select * from v2 where d_year = 1999 and avg_monthly_sales > 0 and case when avg_monthly_sales > 0 then abs(sum_sales - avg_monthly_sales) / avg_monthly_sales else null end > 0.1 order by sum_sales - avg_monthly_sales, 3 limit 100;