In data warehousing, what is the purpose of a roll-up operation?

Roll-up is a compression technique to reduce storage space in data warehousing.
Roll-up is a dimension hierarchization process to move from detailed to summary levels.
Roll-up is a security feature restricting access to certain data in a data warehouse.
Roll-up is used to drill down into detailed data, providing a more granular view.

In data warehousing, a roll-up operation involves moving from a detailed level to a higher-level summary. It is part of the dimension hierarchization process, allowing users to analyze data at different levels of granularity. Understanding roll-up operations is essential for designing efficient and user-friendly data warehouses.

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