This thesis examines ways of comparing performance of Oracle databases. The need to compare performance is given by making changes in database systems, for example changes in databases structures or database management systems. One of the goals of this thesis includes a description of options and ways of comparing performance of Oracle databases which does not involve any additional licensing costs. Because there is a need to evaluate obtained performance indicators, part of this thesis deals with the design and implementation tool, which allows analysis of data and their evaluation through defined reports. Functionality of the tool is verified and demonstrated on data obtained from real databases. The main contribution of this thesis is the implementation of the tool, which significantly facilitate evaluating performance impact of changes which should be made in the production database.

This master's thesis describes possibilities of Oracle Database 10g and 11g monitoring. It let the reader know about practical tools for monitoring and describes the database's internal catalogs preserving statistics and the information about running database instances within history. Next, it describes design of an Oracle database monitoring tool, describtion of its implementation and at the end its evaluation and comparison with other similar applications.