The TPCH connector provides a set of schemas to support the TPC Benchmark™ H (TPC-H). TPC-H is a database benchmark used to measure the performance of highly-complex decision support databases.
This connector can also be used to test the capabilities and query syntax of openLooKeng without configuring access to an external data source. When you query a TPCH schema, the connector generates the data on the fly using a deterministic algorithm.
To configure the TPCH connector, create a catalog properties file
etc/catalog/tpch.properties with the following contents:
The TPCH connector supplies several schemas:
SHOW SCHEMAS FROM tpch;
Schema -------------------- information_schema sf1 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 TPCH connector.
Every TPCH schema provides the same set of tables. Some tables are identical in all schemas. Other tables vary based on the scale factor which is determined based on the schema name. For example, the schema
sf1 corresponds to scale factor
1 and the schema
sf300 corresponds to scale factor
300. The TPCH connector provides an infinite number of schemas for any scale factor, not just the few common ones listed by
SHOW SCHEMAS. The
tiny schema is an alias for scale factor
0.01, which is a very small data set useful for testing.