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  • Book Overview & Buying Oracle 10g/11g Data and Database Management Utilities
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Oracle 10g/11g Data and Database Management Utilities

Oracle 10g/11g Data and Database Management Utilities

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Oracle 10g/11g Data and Database Management Utilities

Oracle 10g/11g Data and Database Management Utilities

4 (1)

Overview of this book

Does your database look complicated? Are you finding it difficult to interact with it? Database interaction is a part of the daily routine for all database professionals. Using Oracle Utilities the user can benefit from improved maintenance windows, optimized backups, faster data transfers, and more reliable security and in general can do more with the same time and resources.
Table of Contents (18 chapters)
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Oracle 10g/11g Data and Database Management Utilities
Credits
About the Author
About the Reviewer
Preface

Chapter 3. External Tables

When working in data warehouse environments, the ExtractionTransformationLoading(ETL) cycle frequently requires the user to load information from external sources in plain file format, or perform data transfers among Oracle database in a proprietary format. This requires the user to create control files to perform the load. As the format of the source data regularly doesn't fit the one required by the Data Warehouse, a common practice is to create stage tables that load data into the database and create several queries that perform the transformation from this point on, to take the data to its final destination.

A better approach, would be to perform this transformation 'on the fly' at load time. That is what External Tables are for. They are basically external files, managed either by means of the SQL*Loader or the data pump driver, which from the database perspective can be seen as if they were regular read only tables.

This format allows the user to think...

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Oracle 10g/11g Data and Database Management Utilities
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