Bachelor thesis is focused on comparing two database systems – PostgreSQL and MySQL. Replication is important part of working with data in database, which is running on server. Other servers called clients are querying to this server. Theoretical part represents basic introduction to the rules of replication, working with spatial data in the databases and evaluation of databases based on prepared criteria. Practical part is focused on own testing, which was run on 2 devices on local network – personal computer and notebook. Input data are mostly free vector and raster layers which are commonly used by the students. Main step before own testing is to set criteria which will be monitored and measured to make an evaluation. Based on statistical methods both database systems are compared in practical use of replication. Next to evaluation, there is also practical example of replication in real world. Important part of the work is to prepare step-by-step manual for students. Manual consists of detailed steps to set and initialize replication on their own of both database systems PostgreSQL and MySQL.