SQL Developer Data Modeler (SDDM) is a full function data modeling tool provided for FREE by Oracle. It has many features built in that can be leveraged to capture the design of an existing (probably undocumented) database, retrofit it to a logical model, re-engineer it to multiple physical models (including multi-dimensional), and even apply standards, then generate revised DDL to implement your newly standardized design. You can even use one logical model to develop multiple physical models that can be deployed to different RDBMS. The presentation will provide step-by-step instructions on how to do all this so the attendees can go back to the office and quickly create diagrams of all their existing databases (Oracle and non-Oracle!). See more content like this by following my blog http://kentgraziano.com or follow me on twitter @kentgraziano.

1. Data Warrior LLC
Reverse Engineering (and Re-Engineer) an
Existing Database Using Oracle SQL
Developer Data Modeler
Kent Graziano
Data Warrior LLC
http://kentgraziano.com #Kscope

2. Data Warrior LLC
Agenda
 Bio
 Reverse Engineering
 Logical Model
 Forward Engineer Changes
 Generate DDL
 Multidimensional Model
 Cool Features
 Demo, demo, demo
http://kentgraziano.com #Kscope

3. Data Warrior LLC
My Bio
 Oracle ACE (BI/DW)
 Certified Data Vault Master
 Data Architecture and Data Warehouse Specialist
 Co-Author of
● The Business of Data Vault Modeling (2008)
● The Data Model Resource Book (1st Edition)
● Oracle Designer: A Template for Developing an Enterprise Standards
Document
 Past-President of ODTUG and Rocky Mountain Oracle User
Group
 Co-Chair BIDW SIG for ODTUG
 KScope12 Fitness Guru
http://kentgraziano.com #Kscope

4. Data Warrior LLC
Install
 Mui Easy!
 Download, unzip, execute!
● http://www.oracle.com/technetwork/developer-
tools/datamodeler/overview/index.html
 The best part – it is Free!
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5. Data Warrior LLC
Reverse Engineering
 Called Import
● From Data Dictionary
● From DDL files
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6. Data Warrior LLC
Importing a Model (Reverse Engineering)
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7. Data Warrior LLC
Importing from DDL
 Select Import -> DDL
 Click green “+” to add a file to import
 Pick text file with DDL from browser
 Click OK
 Specify what DB the DDL came from
 Navigate the Merge wizard to select what to
import
● Press Merge button
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8. Data Warrior LLC
Supported Databases to Import
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9. Data Warrior LLC
Merging the Import
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10. Data Warrior LLC
Viola!
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11. Data Warrior LLC
Adding in FKs
 Many times existing DBs have no FKs
● Use the NEW “Discover Foreign Keys”
● Or draw them in by hand
 Automatically tries to generate a new
migrating column in the target table
● Will only show candidate columns with exact
data type and size match
● If you select an existing column, it will not
save the generated column
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12. Data Warrior LLC
Discover FKs (New Feature)
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13. Data Warrior LLC
Adding in FKs
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14. Data Warrior LLC
Creating the Logical Model
 One button push!
● Creates entities
● All upper case
● Creates Attributes
● Retains case like relational model
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15. Data Warrior LLC
Creating the Logical Model
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16. Data Warrior LLC
Creating the Logical Model
● Creates relationships
● Using Barker Notation
● Drops inherited PK columns
● Drops inherited FK column
● Using Bachman Notation or Information
Engineering
● Displays inherited attributes
● Can change notation on the fly with right mouse
menu
● Keeps layout of physical model!
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17. Data Warrior LLC
Logical Model - Barker
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18. Data Warrior LLC
Logical Model - Bachman
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19. Data Warrior LLC
Forward Engineering Changes
 Edit the Logical
● Add relationship names
● Change or add attributes
● Add new entities
● Add new relationships
 Press the ‘engineer to relational model’ button
● Check dialog for changes
● Uncheck any unwanted changes
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20. Data Warrior LLC
Engineer to Relational
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21. Data Warrior LLC
Generating New DDL
 Use the new Reconcile button to sync the
database and the model
● Get Compare dialog to select what to change
 Will generate alters if appropriate
● New columns
● Change in mandatory setting
 Will generate a complete replacement script
that copies existing data
● Change in data type or precision
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22. Data Warrior LLC
Generate Sync Changes
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23. Data Warrior LLC
Sync DDL (Alter)
ALTER TABLE HR.COUNTRIES
MODIFY ( COUNTRY_NAME NOT NULL )
;
ALTER TABLE HR.COUNTRIES ADD
( Country_Abbreviation VARCHAR2 (4) NOT NULL )
;
ALTER TABLE HR.JOBS
MODIFY ( MIN_SALARY NOT NULL )
;
ALTER TABLE HR.REGIONS
MODIFY ( REGION_NAME NOT NULL )
;
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24. Data Warrior LLC
Sync DDL (Recreate)
ALTER TABLE HR.JOBS RENAME TO bcp_JOBS
;
CREATE TABLE HR.JOBS
(
JOB_ID VARCHAR2 (10 BYTE) NOT NULL ,
JOB_TITLE VARCHAR2 (35 BYTE)
CONSTRAINT JOB_TITLE_NN NOT NULL ,
MIN_SALARY NUMBER (20) NOT NULL ,
MAX_SALARY NUMBER (6)
)
;
INSERT INTO HR.JOBS
(JOB_ID , JOB_TITLE , MIN_SALARY , MAX_SALARY )
SELECT
JOB_ID , JOB_TITLE , MIN_SALARY , MAX_SALARY
FROM
bcp_JOBS
;
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25. Data Warrior LLC
Building a Multidimensional Model
 Create from 3NF Logical
Model
● Right mouse – New MDD
● Create Dimensions,
Levels, Hierarchies, Cubes
using MDD diagramming
icons
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26. Data Warrior LLC
Build a Dimension (from Entity)
 Create Dim container
 Create Level or Levels
● Pick Entity to base Level on
● Pick Level Key and Attributes
 Link 1st Level to Dimension
 Link other levels together to build hierarchies
 Dim levels can be from different entities
 Right mouse option to Engineer to Oracle
Model
● Creates Oracle Dimensions in physical model
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27. Data Warrior LLC
Build a Dimension
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28. Data Warrior LLC
Cool Multidimensional Diagram!
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29. Data Warrior LLC
Convert to Tables
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30. Data Warrior LLC
Other Cool Features
 Can have
● Multiple Relational Models
● From one logical
● Multiple Physical Designs
● Different database implementations from one relational
● Multiple dimensional models
 Cool visual query builder for views
 Real time view query tester
 And much more….
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31. Data Warrior LLC
Other Cool Features
 Standards Enforcement
● Can define and apply design rules
● One button to check the whole model and all rules
● Rules checked when generating DDL
● Vary by RDBMS and version
● Even with errors it generates the code
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32. Data Warrior LLC
Design Rules
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33. Data Warrior LLC
The Good News
 It’s FREE!
 Easy to learn
● You can easily be productive in a few hours
 Just read the dialog boxes to see all the
properties
 Bonus: There is a also a process modeler
that does data flow diagrams!
 Plus lots of other business related meta data
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34. Data Warrior LLC
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35. Data Warrior LLC
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36. Data Warrior LLC
Contact Information
Kent Graziano
The Oracle Data Warrior
Data Warrior LLC
Kent.graziano@att.net
Visit my blog at
http://kentgraziano.com
http://kentgraziano.com #Kscope