In the beginning of the decade of 2000, Brazil has made the choice of using free and open source software whenever possible in the public institutions. One of the challenges was to substitute the well known proprietary choices by PostgreSQL. Every system is big and have high concurrency, a new database system poses several challenges in the data centers, like: how to integrate it with existing hardware, how to have support for it, how to make people believe it will work well and support the load. The formation of technicians and DBAs. During the process, what problems a consultant have to address, give good answers to and how to address them well.