Which statement about data slices in a data warehouse is accurate?

Which statement about data slices in a data warehouse is accurate?

• A. They allow only a single time period analysis
• B. They are not used for reporting
• C. They must be kept permanently unchanged
• D. They enable reporting over various time periods within the time horizon

Answer: (D)

The idea being tested is that data slices in a data warehouse are designed to support reporting across different time periods within the available data window. A slice is a subset defined by a time dimension (and possibly other dimensions) that lets you pull out and analyze data for a specific period or compare multiple periods. This capability is what makes it possible to generate reports for monthly, quarterly, or yearly views and to compare trends across those periods within the overall time horizon you’re examining. It’s not limited to a single time period, and it’s a tool used explicitly for reporting. Some statements people might encounter are inconsistent with this use. For example, restricting slices to a single time period would prevent meaningful time-based comparisons. Claiming slices are not used for reporting ignores their practical role in delivering period-specific analyses. Saying slices must be kept permanently unchanged misunderstands how slices are used in practice; they can be refreshed or recomputed as data updates or as you extend the time horizon.

The idea being tested is that data slices in a data warehouse are designed to support reporting across different time periods within the available data window. A slice is a subset defined by a time dimension (and possibly other dimensions) that lets you pull out and analyze data for a specific period or compare multiple periods. This capability is what makes it possible to generate reports for monthly, quarterly, or yearly views and to compare trends across those periods within the overall time horizon you’re examining. It’s not limited to a single time period, and it’s a tool used explicitly for reporting.

Some statements people might encounter are inconsistent with this use. For example, restricting slices to a single time period would prevent meaningful time-based comparisons. Claiming slices are not used for reporting ignores their practical role in delivering period-specific analyses. Saying slices must be kept permanently unchanged misunderstands how slices are used in practice; they can be refreshed or recomputed as data updates or as you extend the time horizon.