By Simon Greener, Siva Ravada
This booklet is a sophisticated useful consultant to utilising and lengthening Oracle Spatial. This ebook is for latest clients of Oracle and Oracle Spatial who've, at a minimal, uncomplicated operational event of utilizing Oracle or an similar database. complicated abilities should not required
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Extra info for Applying and extending Oracle Spatial
No part of this book may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, without the prior written permission of the publisher, except in the case of brief quotations embedded in critical articles or reviews. Every effort has been made in the preparation of this book to ensure the accuracy of the information presented. However, the information contained in this book is sold without warranty, either express or implied. Neither the authors, nor Packt Publishing, and its dealers and distributors will be held liable for any damages caused or alleged to be caused directly or indirectly by this book.
A fully specified model that is application independent should control spatial data storage. A good data model supports and enhances application access without compromising quality. In addition, database features can be used to support applications that have limited functionality when it comes to table and column design. For example, some applications mandate a single spatial column per table or only a single homogeneous geometry type per spatial column. These limitations can be accommodated quite easily using database features such as views and triggers.
The USER_ view is used to create a metadata entry for a single SDO_GEOMETRY column within a database table or view. An entry must be created for each SDO_GEOMETRY column within a table; entries for SDO_GEOMETRY columns in views are optional. If a table has more than one column of type SDO_GEOMETRY, then there is one metadata entry for each column of spatial data in that table. The ALL_ view shows all of the spatial layers that can be accessed by the current user. If a user has the Select grant on another user’s table with SDO_GEOMETRY columns, the first user can see the metadata entries for those tables in the ALL_ view.
Applying and extending Oracle Spatial by Simon Greener, Siva Ravada