Dani Schnider works as Principal Oracle & DWH Consultant for Callista, a Swiss IT service provider for consulting and engineering. He has been working in database consulting for over 20 years, from 1999 to 2022 for Trivadis in Switzerland. Dani works with Oracle databases since 1994, since 1997 mainly in data warehouse projects. His tasks include DWH architecture reviews, data modeling, ETL development and performance optimization in Oracle databases. Dani is Oracle ACE Director and co-author of the books Data Warehousing mit Oracle ? Business Intelligence in der Praxis and Data Warehouse Blueprints, both published in German by Hanser-Verlag. On his blog, he writes about design and performance topics related to Oracle data warehouses. He is a regular speaker at international Oracle user group conferences.