Contents
What is outrigger dimension?
An outrigger is a dimension table or entity that is joined to other dimension tables in a star schema. Outriggers are often used when a dimension table or entity is referenced by another dimension. The primary key of an outrigger is referenced by the foreign key of a dimension table or entity.
What are customer dimensions?
The Customer dimension breaks sales figures down by the customer hierarchy into single customers. The hierarchy between the root element All Customers and the individual customer can be organized in an arbitrary way to match the reporting requirements.
What are the mini dimension approaches?
As with many dimensional modeling techniques, there are mini-dimension variations used to address specific business processes or analytical scenarios. These approaches are split, multiple, and banded-value, as described below: Split approach—single mini-dimension.
What is a large dimension?
High Dimensional means that the number of dimensions are staggeringly high — so high that calculations become extremely difficult. With high dimensional data, the number of features can exceed the number of observations. For example, microarrays, which measure gene expression, can contain tens of hundreds of samples.
What is junk dimension with example?
A junk dimension combines two or more related low cardinality flags into a single dimension. An example of this may be car color (red, black, blue, etc.) and body style (sedan, van, SUV, etc.)
What is a mini dimension?
Mini-dimensions contain the rapidly changing attributes of the original dimension and are treated as a stand-alone dimension. This dimension will band the attributes together instead of treating them as individual pieces of data. Here is a partial example of the data which may be stored in the mini-dimension table.
What are the dimensions of customer value?
Customer Value is created along three different dimensions: Functionality (the job that the solution does and how well it does it), Reliability (how consistent the solution is at doing the job well) and Convenience (how accessible the solution is to customers and how easy it is to use).
What are the 5 service quality dimensions?
Service quality in the SERVQUAL model consists of five dimensions: reliability, responsiveness, assurance, empathy, and tangibles. These dimensions are used in service quality gap, which implies that there is a difference between the expectations of customers and perception of services [25].
What are the 3 types of SCD?
What are the types of SCD?
- Type 0 – Fixed Dimension. No changes allowed, dimension never changes.
- Type 1 – No History. Update record directly, there is no record of historical values, only current state.
- Type 2 – Row Versioning.
- Type 3 – Previous Value column.
- Type 4 – History Table.
- Type 6 – Hybrid SCD.
Is date a fact or dimension?
Typically dimensions in a data warehouse are organized internally into one or more hierarchies. “Date” is a common dimension, with several possible hierarchies: “Days (are grouped into) Months (which are grouped into) Years”, “Days (are grouped into) Weeks (which are grouped into) Years”