Level-based measures are created to perform calculation at a specific level of aggregation. They allow to return data at multiple levels of aggregation with one single query. It also allows to create share measures.

Example

Let us say there is a company XYZ Electronics which sells its products in many regions, countries and cities. Now the company President wants to see the total revenue at country level – one level below region and one level above cities. So total revenue measure should be summed up to the country level.

These type of measures are called level-based measures. Similarly, you can apply level-based measures on the time hierarchies.

Once the dimension hierarchies are created, level-based measures can be created by double clicking on the total revenue column in the logical table and setting the level in the levels tab.

Create Level-Based Measures

Open the repository in offline mode. Go to File → Open → Offline.

Select .rpd file and click open → Enter repository password and click Ok.

In BMM layer, right-click on Total Revenue column → New Object → Logical column.

It will open the logical column dialog box. Enter the name of logical column total revenue. Go to column source tab → Check derived from existing columns using an expression.

Once you select this option, expression edit wizard will be highlighted. In expression builder wizard, select the logical table → Column name → Total revenue from the left side menu → Click OK.

Now go to level tab in logical column dialog box → Click on logical dimension to select it as grand total under logical level. This specifies that the measure should be calculated at grand total level in the dimension hierarchy.

Once you click OK → Total Revenue logical table will appear under the logical dimension and Fact tables.

This column can be dragged to presentation layer in the subject area to be used by end users to generate reports. You can drag this column from fact tables or from logical dimension.

OBIEE – Aggregates

Aggregations are used to implement query performance optimization while running the reports. This eliminates the time taken by query to run the calculations and delivers the results at fast speed. Aggregate tables has less number of rows as compared to a normal table.

How Aggregation Works in OBIEE?

When you execute a query in OBIEE, BI server looks for the resources which has information to answer the query. Out of all available sources, the server selects the most aggregated source to answer that query.

Adding Aggregation in a Repository

Open the Repository in an offline mode in the Administrator tool. Go to File → Open → Offline.

Import the metadata and create logical table source in BMM layer. Expand the table name and click on source table name to open logical table source dialog box.

Go to column mapping tab to see map columns in Physical table. Go to content tab → Aggregate content group by selecting the logical level.

You can select different logical levels as per the columns in fact tables like Product Total, Total Revenue, and Quarter/Year for Time as per dimension hierarchies.

Click OK to close dialog box → save the repository.

When you define Aggregate in logical fact tables they are defined as per dimension hierarchies.

So, this brings us to the end of blog. This Tecklearn ‘Level-Based Measures and Aggregates in OBIEE’ blog helps you with commonly asked questions if you are looking out for a job in Oracle BI. If you wish to learn OBIEE and build a career in Business Intelligence domain, then check out our interactive, Oracle Business Intelligence Enterprise Edition (OBIEE) Training, that comes with 24*7 support to guide you throughout your learning period. Please find the link for course details:

https://www.tecklearn.com/course/oracle-business-intelligence-enterprise-edition-training-and-certification/

Oracle Business Intelligence Enterprise Edition (OBIEE) Training

About the Course

Oracle Business Intelligence Enterprise Edition (OBIEE) Training and Certification training course lets you master the Oracle Business Intelligence and Analytics platform. You will gain in-depth knowledge on OBIEE advanced features, BI dashboards, reports, etc., through hands-on training sessions. This course is meant to provide detailed knowledge of the OBIEE 12c. You will be trained in various Business Intelligence scenarios, BI life cycle, concepts of OLAP and working with charts and graphs.

Why Should you take OBIEE Training?

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What you will Learn in this Course?

Data Modelling and Data Warehousing Concepts

Introduction to Oracle Business Intelligence Enterprise Edition (OBIEE)
Data models
Data warehousing
Data modelling implications and the impact of Data modelling on business intelligence

Business Intelligence Concepts

Overview of Business Intelligence
Description of BI Stack: BI technology, BI Server and BI Scheduler
Need for reporting in business
Difference between OLTP and OLAP
Multidimensional and relational analytical processing

OBIEE Installation

OBIEE Installation (12c)
Oracle Business Intelligence Suite
Architecture of OBIEE
Key features and components

Online Analytical Processing (OLAP)

Concept of Online Analytical Processing
Significance of OLAP in business intelligence life cycle
Star Schema and Designing with Star Schema
Enterprise information model
Snow flake and constellation

Oracle BI Repository

What is Oracle Business Intelligence Repository?
Directory structure installation, services,
Analytics and interactive reporting,
Dashboard creation and multiple report creation

Business Intelligence Repository Business Model

How to build a Business Model and Mapping Layer in BI Repository
Data format, Conditional format, Removing filters,
Report Saving
Creation of new folder
Working with the Enterprise Manager
Testing and validation of the Repository
Understanding the process of Cache disabling
Dashboard prompt and filtering

Dashboard Creation

Creation and Setup of OBIEE Dashboard
Basics of OBIEEE dashboard
Deploying Dashboard Builder for building Dashboards
Edit, Share and Save options in Dashboard analysis
Process of Cache creation and clearing
ODBC functions
Logical Table Source, Summary and Detail Report

OBIEE Repository

OBIEE Repository
Creation of Test Report and adding calculations
Deployment of OBIEE analysis
Repository variables, session and presentation variables

OBIEE Security & Management

Securing the Oracle Business Intelligence Suite with Enterprise Manager
Creation of alerts and notifications
Administration, Maintenance and Grouping
Types of security in OBIEE
Task and folder level security

Differences between OBIEE 11g and 12c

Hands on Variables

New Features of OBIEE 12c

Repository Development
Catalog Development
Deployment-Online
RPD Deployment

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