b copyright © 2009, oracle. all rights reserved. creating experts

BCopyright © 2009, Oracle. All rights reserved.

Creating Experts

Copyright © 2009, Oracle. All rights reserved.B - 2

Objectives

After completing this lesson, you should be able to do the following:

• Explain the benefits of Warehouse Builder Experts for novice users

• Use the Expert Editor to define an Expert

• Identify scenarios where Experts can be used


Perception: Power and Complexity of OWB Challenges New Users

• Oracle can solve my problems and is scalable.

• But there are too many options for the novice user:– Where to start?– What to do next?– What does this do?– Where is this thing?– How do I do this?

• Bottomline: OWB can be perceived as complex for new users…


Requirement: Harnessing OWB Power and Complexity for New Users

• Users possess best practices or domain-specific knowledge.

• OWB provides powerful features that support various modeling and design requirements in a very flexible manner.

• Users ask:– Is there a guided way to use those features quickly to

implement a solution?

– Can OWB help manage those best practices in some way?


Solution: OWB “Experts” Give Directed Guidance and Knowledge Management

• Directed guidance across various components and features in OWB

• Knowledge management to encapsulate and manage best practices and domain-specific solutions

• Leveraging of OWB scriptinglanguage

OWB Experts


Major Benefits of Experts

• Can automate parts of a repetitive task

• Simplify the use of Warehouse Builder by exposing only the strictly necessary tasks

• Improve productivity by forcing the user to go through a set of steps

• Lower the learning curve for inexperienced users

1.2.3.

Define ADefine BMap A to B


Profile of Designers and Users of Experts

• Designers of Experts:– OWB Development for cross-component feature– Consultants for best-practice solutions– Customers for routine process

• Users of Experts:– Novice users who just run predefined Experts and follow the

task list


Extended OWB Scripting• OMU commands for UI scripting

• OMB commands for non-UI logic

• Tcl for flow control

• Expert object leads to generated OWB script

Framework of Experts

Expert Editor (Design)• Graphical editor to design the task flow of an expert• Reusable OWB design components exposed as tasks • Used by the true “expert” to help capture “knowledge”

Expert Assistant (Run Time)• Different ways to run “experts”

– Guided-assistant environment inside OWB – Stand-alone program as part of OMB scripting– Embedded in third-party application

• Used by novice users

Expert-Related Objects• Expert Modules• Experts• Tasks• Transitions• Variables


1. Sample A (wizard)

2. Define B (wizard)

3. Map A to B (custom dialog)

Task Sequence: No User Complexity

Expert Warehouse Builder

Preprocessingstep

Create external tablebased on sampled flat file.

Define variables

Pass variablevalues

Enforce project standards

Postprocessingstep

Tcl

Tcl

Tcl

Tcl

$<variable name>

$<variable name>

Tcl

OMB Plus

OMB Plus

End user


Creating an Expert

1. Create an Expert Module.

2. Create an Expert.


Defining an Expert

• Define the Expert scenario.

• Map individual tasks to existing OWB components.

• If a task is not already available, Expert designers can do the following to accomplish custom logic:– Define a nested Expert, or – Use OMB or a Java task


Expert Editor

• Use Expert Editor to define details.• Each Expert can have optional preprocessing and

postprocessing procedures.• Implemented in OWB scripting• Expert can itself be added as a task.• Embedded Expert tasks show as nested experts.

Canvas ComponentPalette

Task Editor


Defining the Tasks

Add the OMB commands to implement the functionality in the Main tab area

Drag and drop tasks from the palette


Starting an Expert

During execution, the Warehouse Builder console disappears.

The Task Assistant displays instructions and enforces flow control.


Creating Your Own Custom Dialog

• Java task– Java Swing UI for end users

• Custom dialog task– A dialog for simple information

collection using the OMUPROMPT command

– Editor support for construction and preview of dialog


Use Cases

• 0-to-OLAP

• ROLAP-to-MOLAP

• Typical warehousing

• Guided Maplet usage

• EBI Assistant

• Tutorials

• Copy table

• Table to star dimension

• 3NF schema to snowflake dimension

• File to table

• Master-Detail file to tables

• PeopleSoft customer to Oracle data hub

• Administration tasks automation

• And much more…


Scenario: ROLAP to MOLAP in Five Easy Steps

• Customer has relational Oracle data warehouse system.

• The customer wants to build OLAP data mart derived from current model.

• It does not matter whether or not the customer used Warehouse Builder to build the system.


ROLAP to MOLAP in Five Easy Steps

• Identify your ROLAP cube.

• Name your MOLAP cube.

• Specify your filters (limits).

• Define your metadata:– Cubes with measures– ETL map to load from ROLAP to MOLAP

• Deploy and run.

ROLAP MOLAP FILTER CREATE DEPLOY


Scenario: Expert for Creating External Table

You could define a simple Expert for creating an external table:

1. Choose from a predefined task list (atomic tasks).

2. Sample the flat file.

3. Create an external table.

4. Deploy related objects.

5. Compile an Expert.

6. Name the Expert.

7. Register the Expert.


Summary

In this lesson, you should have learned about the benefits that Warehouse Builder Experts offer:

• Enhanced usability– Features exposed in a collaborative way– Flow control offers guidance support– Extreme power and flexibility with scripting

• Efficient knowledge management– Business logic captured as metadata– History management, security, change management,

metadata exchange, and so on, all supported

b copyright © 2009, oracle. all rights reserved. creating experts

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