# Presto 316 Documentation

## 6.23. TPCDS Connector

The TPCDS connector provides a set of schemas to support the TPC Benchmark™ DS (TPC-DS). TPC-DS is a database benchmark used to measure the performance of complex decision support databases.

This connector can also be used to test the capabilities and query syntax of Presto without configuring access to an external data source. When you query a TPCDS schema, the connector generates the data on the fly using a deterministic algorithm.

## Configuration

To configure the TPCDS connector, create a catalog properties file `etc/catalog/tpcds.properties` with the following contents:

    connector.name=tpcds

## TPCDS Schemas

The TPCDS connector supplies several schemas:

    SHOW SCHEMAS FROM tpcds;

           Schema
    --------------------
     information_schema
     sf1
     sf10
     sf100
     sf1000
     sf10000
     sf100000
     sf300
     sf3000
     sf30000
     tiny
    (11 rows)

Ignore the standard schema `information_schema` which exists in every catalog and is not directly provided by the TPCDS connector.

Every TPCDS schema provides the same set of tables. Some tables are identical in all schemas. The scale factor of the tables in a particular schema is determined from the schema name. For example, the schema `sf1` corresponds to scale factor `1` and the schema `sf300` corresponds to scale factor `300`. Every unit in the scale factor corresponds to a gigabyte of data. For example, for scale factor `300`, a total of `300` gigabytes will be generated. The `tiny` schema is an alias for scale factor `0.01`, which is a very small data set useful for testing.