  Often corporations need tools to improve their decision making in a
competitive market. In general, these tools are based on data warehouse
platforms to mange and analyze large amounts of data. However, several of these
corporations do not have enough resources to buy such platforms because of the
high cost. This work is dedicated to a feasibility study of a low cost platform
to data warehouse. We consider as a low cost platform the use of open source
software like the PostgreSQL database system and the GNU/Linux operational
system. We verify the feasibility of this platform by executing two benchmarks
that simulate a data warehouse workload. The workload reproduces a multi-user
environment with the execution of complex queries, which executes:
aggregations, nested sub queries, multi joins, in-line views and more.
Considering the results we were able to highlight some problems on the
PostgreSQL database system, and discuss improvements in the context of data
warehouse.
