What are logical dimensions?

What are logical dimensions?

In the Business Model and Mapping layer, a dimension object represents a hierarchical organization of logical columns (attributes). There are two types of logical dimensions: dimensions with level-based hierarchies (structure hierarchies), and dimensions with parent-child hierarchies (value hierarchies).

How do you determine a slowly changing dimension?

What are Slowly Changing Dimensions?

1. Type 0 – The passive method.
2. Type 1 – Overwriting the old value.
3. Type 2 – Creating a new additional record.
4. Type 3 – Adding a new column.
5. Type 4 – Using historical table.
6. Type 6 – Combine approaches of types 1,2,3 (1+2+3=6)

What are types of hierarchies in Obiee?

Types of Level-based Hierarchies

• Unbalanced Hierarchies. Unbalanced hierarchies are those where all the lower levels don’t have the same depth.
• Skip Level Hierarchies. In skip-level hierarchies, few members don’t have values at higher level.
• Dimension with Parent-child Hierarchies.

How do I create a time dimension hierarchy in Obiee 12c?

Right click on the time dimension -> Select New object -> Select Logical Level. follow the same above process to create the levels of Quarter, Month, Week and Day. Now The time dimension hierarchy is ready without any level Keys. Now drag the corresponding columns from time dimension table to time dimension hierarchy.

Which is an example of a hierarchies in a dimension?

Each dimension contains one or more hierarchies. All hierarchies must have a common leaf level. For example, a time dimension might contain a fiscal hierarchy and a calendar hierarchy, with a common leaf level of Day. In this example, Day has two named parent levels, Fiscal Year and Calendar Year that are both children of the All root level.

What do you need to know about level based hierarchies?

About Level-Based Hierarchies. A dimension contains two or more logical levels. When creating logical levels, you should create a Grand Total level and then create child levels, working down to the lowest level. The following are the parts of a dimension: Grand Total level The Grand Total level represents the sum of all totals for a dimension.

What are hierarchical dimensions in a data warehouse?

Today, continuing through our look at the advanced modeling techniques of dimensional data warehouses, we will take a look at simple hierarchical dimensions. Hierarchical dimensions are those dimensions which have a parent/child relationship.

Can a dimension have more than one grand total level?

Each dimension can have just one Grand Total level. The Grand Total level does not contain dimensional attributes and does not have a level key. You can associate measures with a Grand Total level. The aggregation level for those measures is the grand total for the dimension. The Grand Total level can exists without any columns.