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Building the Physical Layer of a Repository
Copyright © 2007, Oracle. All rights reserved.
Objectives
After completing this lesson, you should be able to:
• Identify and describe the objects in the Physical layer
of a repository
• Create the Physical layer of a repository
2-2
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Physical Layer
• Contains objects representing the physical data
sources to which Oracle BI Server submits queries
• May contain multiple data sources
• Is typically the first layer built in the repository
Data sources
2-3
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Physical Layer Objects
Are objects in the Physical layer, such as connection
pools, folders, tables, columns, and keys
• Expand a database object to display the objects it
contains.
Database
Connection pool
Schema folder
Tables
Columns
Key
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Database Object
• Is the highest-level object in the Physical layer
• Defines the data source to which Oracle BI Server
submits queries
Database object
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Database Object: General Properties
Use the General tab to view and set general properties for
a database object.
Name
Type
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Database Object: Features
Use the Features tab to view and set the SQL features that
Oracle BI Server uses with this data source.
Enable or disable feature
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Default SQL
features for this
data source
Connection Pool
• Defines how Oracle BI Server connects to a data
source
• Specifies the ODBC or native data source name
• Allows multiple users to share a pool of data source
connections
Connection pool name
Maximum number
of connections
Data source name
Shared logon user
name and password
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Connection pooling enabled
Schema Folder
Is an optional display folder that contains tables and
columns for a physical schema
• To create a schema folder, right-click a database object
and select New Object > Physical Schema.
Schema folder
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Physical Table
• Is an object that corresponds to a table in a physical
data source
• Is typically imported from a database or other data
source
• Provides the metadata necessary for Oracle BI Server
to access the tables with SQL requests
Physical table
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Physical Table Properties
Double-click a physical table object to view its properties:
Use tabs to create, view,
or modify other properties.
Name
Table type
Cacheable
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Physical Table: Alias Table Type
Is a virtual physical table object that points to a physical
table object
• Right-click a physical table and select New Object >
Alias.
• Provide a name for the alias table.
• The alias table appears with an alias icon in the
Physical layer.
Alias
name
Source
table
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Alias synchronization is
automatic.
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Physical Table: Select Table Type
Specifies that a physical table object is a SELECT
statement
Table
Type
Database
specific SQL
SELECT
statement
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Physical Table: View Deployment
Creates a corresponding database view for metadata views
Select Deploy View.
View created in database
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Physical Column
Is an object that corresponds to a column in a physical
database
Columns
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Key Column
Defines relationships between tables
• Primary key:
– Uniquely identifies a single row of data
– Consists of a column or set of columns
– Is identified by a key icon
• Foreign key:
– Refers to the primary key columns in another table
– Is composed of a column or set of columns
Key
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Joins
Represent the primary key–foreign key relationships
between tables in the Physical layer
Join properties
Physical Diagram
Double-click
to view join
properties.
Join expression
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ABC Scenario
Data for ABC resides in the SUPPLIER2 schema in an
Oracle relational database, containing tables with:
• Invoice data
• Customer data
Physical layer
• Product data
• Period data
Source data
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SUPPLIER2
Import metadata
using
Administration
Tool
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Implementation Steps
1.
2.
3.
4.
5.
6.
7.
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Define an ODBC System Data Source Name (DSN).
Import the physical schema.
Select tables and columns for import.
Import keys and joins.
Verify the import.
Edit connection pool properties.
Define physical keys and joins.
Copyright © 2007, Oracle. All rights reserved.
1. Define an ODBC System DSN
Use the ODBC Data Source Administrator to define a
system DSN for each data source.
Data source name
TNS service name
Test
User ID
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2. Import the Physical Schema
Use the Oracle BI Administration Tool to import the
physical schema.
Select ODBC source.
Select File > Import
> from Database.
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3. Select Tables and Columns for Import
Select the tables and columns needed to support the
business model.
Filter tables for import.
Select tables or
columns for import.
Tables and keys
selected by default
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4. Import Keys and Joins
Keys, foreign keys, and corresponding joins are imported
automatically only if they are already defined in the data
source.
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5. Verify the Import
• Verify that the correct schema, tables, columns, and
keys were imported.
• Use Update Row Count and View Data features to verify
connection.
Schema
Tables
Columns
Key
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6. Edit Connection Pool Properties
After import, verify or modify connection pool properties
using the connection pool properties dialog box.
Connection
pool name
Call interface
Maximum number of connections
Shared logon
user name and
password
Data source name
Connection pooling enabled
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7. Define Physical Keys and Joins
The Administration Tool allows you to define physical keys
and joins that were not imported automatically.
• Define keys using the Physical Table properties dialog
box.
• Define joins and keys using the Physical Diagram.
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Defining Keys Using the Table Properties Dialog
Open the table properties dialog box to view or define
keys.
Select the appropriate tab.
Check the appropriate check box
to define the key.
Click New.
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Using the Physical Diagram
Use the Physical Diagram to view or define keys and joins.
Click the Physical
Diagram icon ...
... or right-click the
object to open the
Physical Diagram.
Double-click the link to open
the Joins properties box.
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Defining Foreign Key Joins
1. Select New
Foreign Key.
5. Select key
columns.
2. Select “one” table
in relationship.
3. Select "many”
table in relationship.
4. Physical
Foreign Key
dialog opens.
6. Join expression: first table selected maintains primary key;
second table selected maintains foreign key to first table.
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Summary
In this lesson, you should have learned how to:
• Identify and describe the objects in the Physical layer
of a repository
• Create the Physical layer of a repository
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Practice 2-1 Overview:
ABC Business Scenario
This practice covers the ABC business scenario.
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Practice 2-2 Overview:
Gathering Information to Build an
Initial Business Model
This practice covers the following topics:
• Gathering and analyzing the business requirements of
the ABC company
• Determining the structure of the initial business model
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Practice 2-3 Overview:
Creating a Repository and Importing
a Data Source
This practice covers the following topics:
• Creating a new repository
• Import tables into the Physical layer of the repository
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Practice 2-4 Overview:
Defining Keys and Joins
This practice covers the following topic:
• Defining the primary keys, foreign keys, and joins in
the Physical layer using the Administration Tool
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Practice 2-5 Overview:
Creating Alias and Select Tables
This practice covers the following topics:
• Creating an alias table
• Creating a select table
• Deploying a view
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Copyright © 2007, Oracle. All rights reserved.