Data warehouses are the source for consolidated reporting from various data sources. Due to increasing demands for fast results, data warehouses are required to provide data in real time. The largest and technologically most challenging component of data warehouse implementation is loading the data through the ETL (Extract-Transform-Load) process. The article presents a case study of loading data into a data warehouse in real time. — Article published in Uporabna informatika, Issue 1 Jan/Feb/Mar 2006, p. 5-14.