4 Copyright © 2009, Oracle. All rights reserved. Defining Source Metadata.

Defining Source Metadata

Objectives

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

• Define and create flat file and Oracle modules

• Import and sample flat file sources

• Import relational database objects in an Oracle module

• View source data in Data panel

Lesson Agenda

• Data warehouse implementation: Typical steps– Metadata to data– Relational and flat file source metadata: Difference– Data sources

• Flat file sources– Create a flat file module– Import and sample a flat file

• Oracle database sources– Create an Oracle module and import Oracle database

objects– View the source tables data

Data Warehouse Implementation: Typical Steps

1. Define the source metadata.

2. Define staging area metadata.

3. Define a relational dimensional model.

4. Create process flows.

5. Deploy the mappings.

6. Execute or run the mappings.

7. View the data. Part 1

Part 2

Metadata to Data

1. Initialize and organize the modules.

2. Import the metadata. (This gives you only the data definition.)

3. Use the metadata to define the mapping.

4. Deploy and execute the mapping to load the data.

Difference Between Obtaining Relational and Flat File Source Metadata

Flat filesource module:FILE_SOURCE

Staging area

The database link extracts Oracle tables metadata.

XSALES Tables

The flat files are imported and

sampled.

Oracle Databasemodule:XSALES

Source Module

• A module is a logical grouping of related objects under a single folder.

• Source modules hold metadata describing source systems from which you extract data.

OWB 11g does not distinguish between source and target modules

Lesson Agenda

Data Sources

Flat file source

customers.txt (delimited)

Relational source

Channels

Products

Cities

XSALES

file_geography_multi.csv (multi-record)

FILE_SOURCE

ORDERS_SRC

Creating a Flat File Source Module

Create Module Wizard: Connection Information

Location is the path or the drive and directory in the file system where the flat files reside.

Metadata to Data

1. Initialize and organize the modules.

2. Import the metadata. (This gives you only the data definition.)

3. Use the metadata to define the mapping.

4. Deploy and execute the mapping to load the data.

Importing Source Metadata

• You can import and sample the following types of flat files using the Flat Files Sample wizard:– Simple delimited– Fixed-length– Multirecord

Selecting the Flat File for Sampling

View the Sample File

Flat File Sample Wizard: Welcome

The Flat File Sample wizard provides the ability to define simple, delimited text files in as few steps as possible.

Describing the File

Sampling Simple Delimited File

The Flat File Sample Wizard allows specification of more than one character for record terminators, field delimiters and field enclosures. It recognizes X'hex-value' and x'hex-value' as hex-format where 'hex-value' is 0-9 or A-F.

Setting Field Properties

Flat File Sample Wizard: Summary

Advanced: Record Organization

The Sample Wizard enables you to define files that contain logical records.

Advanced: Selecting the File Format

Specify the file format to be Delimited or Fixed Length

Advanced: File Layout

Select Multi Record if file contains two or more types of records. In the Record Types page, specify the Type Value and their corresponding record names.

Advanced: Field Properties

This option is available in the Create Flat File wizard or in the Edit Flat File window > Structure link.

For each record type, you define the fields.

OWB samples the following types of flat files (select all that apply):

a. Character-delimited files

b. Fixed-length files

c. Multirecord files

d. Multibyte fixed length

Out of the following, which one describes the correct sequence of tasks you perform in OWB to use flat file sources:

a. Create a flat file module, select the file for import, and then run through the Sampling wizard to define its metadata.

b. First sample the file to define its metadata, create a flat file module, and then import the flat file.

Lesson Agenda

Data Sources

Flat file source

customers.txt (delimited)

Relational source

Channels

Products

Cities

XSALES

file_geography_multi.csv (multi-record)

FILE_SOURCE

ORDERS_SRC

Creating an Oracle Module

Create Module Wizard: Nameand Description

For Non-Oracle modules, you can select the access method.

ORACLE MODULE

NON-ORACLE MODULE

Create Module Wizard: Connection Information

Editing the Oracle Database Location

Finishing Module Creation and Proceeding to Import

You can either select "Import after finish" option in the Connection Information page or right-click the module in the Projects Navigator panel, and select Import > Database Objects.

Import Metadata Wizard: Filter Information

Filter the objects you want to import

Selecting the Tables for Import

Use the arrow to move available objects to the selected list

Completing the Metadata Import

Viewing Data

To get the XSALES schema tables as sources, you will perform the following tasks (select all that apply):

a. Create a separate OWB project

b. Create an Oracle Module

c. Edit the module location to point to XSALES schema

d. Import the selected tables

Summary

In this lesson, you should have learned how to:

• Define and create flat file and Oracle modules using the Create Module wizard

• Import and sample flat file sources using the File Import and the Flat File Sample wizard

• Import relational database objects in an Oracle module

• View source data in Data panel

Practice 4-1 Overview: Defining and Importing Flat Files and a Relational Source

This practice covers the following topics:

• Creating a flat file source module

• Importing two flat files:– customers.txt (delimited)– File_geography_multi.csv (multi-record)

• Examining the XSALES Oracle database module

• Importing ORDERS_SRC table into the XSALES module.

4 Copyright © 2009, Oracle. All rights reserved. Defining Source Metadata.

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