This paper presents preliminary results of experiments conducted on PT1.11 and PT1.22 data sets in order to compare the performances of both centralized and distributed database management systems. As for centralized systems, we have deployed three different DBMSs: Mysql, Postgresql and DBMS-X (a commercial relational database). Regarding distributed systems, we have deployed HadoopDB and Hive. The goal of these experiments is to report on the ability of these systems to support large scale declarative Queries.