B Copyright © 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

Copyright © 2009, Oracle. All rights reserved. B - 3 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…

Copyright © 2009, Oracle. All rights reserved. B - 4 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?

Copyright © 2009, Oracle. All rights reserved. B - 5 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 scripting language OWB Experts

Copyright © 2009, Oracle. All rights reserved. B - 6 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 Define A Define B Map A to B

Copyright © 2009, Oracle. All rights reserved. B - 7 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

Copyright © 2009, Oracle. All rights reserved. B - 8 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

Copyright © 2009, Oracle. All rights reserved. B Sample A (wizard) 2. Define B (wizard) 3. Map A to B (custom dialog) Task Sequence: No User Complexity Expert Warehouse Builder Preprocessing step Create external table based on sampled flat file. Define variables Pass variable values Enforce project standards Postprocessing step Tcl $ Tcl OMB Plus End user

Copyright © 2009, Oracle. All rights reserved. B - 10 Creating an Expert 1.Create an Expert Module. 2.Create an Expert.

Copyright © 2009, Oracle. All rights reserved. B - 11 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

Copyright © 2009, Oracle. All rights reserved. B - 12 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 Component Palette Task Editor

Copyright © 2009, Oracle. All rights reserved. B - 13 Defining the Tasks Add the OMB commands to implement the functionality in the Main tab area Drag and drop tasks from the palette

Copyright © 2009, Oracle. All rights reserved. B - 14 Starting an Expert During execution, the Warehouse Builder console disappears. The Task Assistant displays instructions and enforces flow control.

Copyright © 2009, Oracle. All rights reserved. B - 15 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

Copyright © 2009, Oracle. All rights reserved. B - 16 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…

Copyright © 2009, Oracle. All rights reserved. B - 17 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.

Copyright © 2009, Oracle. All rights reserved. B - 18 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. ROLAPMOLAPFILTERCREATEDEPLOY

Copyright © 2009, Oracle. All rights reserved. B - 19 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.

Copyright © 2009, Oracle. All rights reserved. B - 20 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