Is it necessary to create primary and foreign keys in order to use tpc-h benchmark? I'm doing some tests with tpc-h benchmark. The tpch-h benchmark simulates a data warehouse environment. The most important things here are the queries against the data warehouse. Therefore, does it make sense to create primary and foreign keys for this benchmark? I read some articles that do that, but I don't understand why it's necessary.
The specification TPC BENCHMARKTM H, Standard Specification, Revision 2.17.1, can be found here. See section "1. LOGICAL DATABASE DESIGN / 1.5 IMPLEMENTATION RULES". Indexes can be created on combinations of  fields defined in 1.4.2.2 and 1.4.2.3 and on date fields. Indexes may only contain fields of one table. So indexes can be built on the following fields:


Table PART:


P_PARTKEY

Table SUPPLIER:


S_SUPPKEY

Table PARTSUPP:


PS_PARTKEY
PS_SUPPKEY

Table CUSTOMER:


C_CUSTKEY
C_NATIONKEY

Table ORDERS:


O_ORDERKEY
O_CUSTKEY
O_ORDERDATE

Table REGION:


R_REGIONKEY

Table LINEITEM:


L_LINENUMBER
L_ORDERKEY
L_PARTKEY
L_SUPPKEY
L_SHIPDATE
L_COMMITDATE
L_RECEIPTDATE

Table NATION:


N_NATIONKEY
N_REGIONKEY