HBase is the open source version of BigTable - distributed storage system developed by Google for the management of large volume of structured data. HBase emulates most of the functionalities provided by BigTable. Like most non SQL database systems, HBase is written in Java. The current work's purpose is to evaluate the performances of the HBase implementation in comparison with SQL database, and, of course, with the performances offered by BigTable. The tests aim at evaluating the performances regarding the random writing and random reading of rows, sequential writing and sequential reading, how are they affected by increasing the number of column families and using MapReduce functions.