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In this chapter, we examined some issues that you must resolve before choosing specific data protection products. We began by considering the types of backups to be performed, the recovery requirements of your organization, and other business issues. We then identified some points that you ll want to keep in mind when choosing server hardware. Armed with this information, we began to look at the various tape devices and other data protection equipment available on the market. To complete the picture, we discussed backup software platforms and other utilities that can be used to make life easier on systems administrators. Of course, none of these solutions will be of much use unless they fit within your business constraints so at this point we took a brief departure from the technical issues to explain the calculation of TCO and ROI two figures which, when managed wisely, can go a long way toward ensuring the success of your data protection strategy. And now, with the fundamental information out of the way, it s time to move on to the real technical work planning and performing database backups on SQL Server 7. We ll examine these processes closely in 6.

If the customer changes its headquarters location, the operational system may simply overwrite the address for customer_id 10711 For analytic purposes, however, it may be useful to track the history of ABC Wholesalers Since the star schema does not rely on customer_id to identify a unique row in the customer dimension, it is possible to store multiple versions of ABC Wholesalers, even though both have the same customer_id 10711 The two versions can be distinguished by different surrogate key values While it would also be possible to support change tracking by supplementing a natural key with a sequence number, the surrogate key allows fact and dimension tables to be joined based on a single column The term slowly changing dimension refers to the manner in which a dimensional schema responds to changes in a source system Detailed examples will be explored in 3, Stars and Cubes.

n Parts I and II of this book, we ve examined the importance of properly planning for backups, emphasizing how you can best evaluate your business requirements and then use that information to form a data protection plan It is important to keep in mind that protecting the information stored in your SQL Server databases is only part of a much bigger picture We began by discussing the importance of planning for companywide data protection options Next, we discussed the importance of protecting your operating systems Windows NT 4 or Windows 2000 since a database server is only as secure as the network operating system (OS) on which it resides We then covered the architecture of SQL Server 7 from several different angles We focused on security and performance, as these two topics will affect your backup strategy most.

Osborne/McGraw-Hill 2600 Tenth Street Berkeley, California 94710 U.S.A. For information on translations or book distributors outside the U.S.A., or to arrange bulk purchase discounts for sales promotions, premiums, or fund-raisers, please contact Osborne/McGraw-Hill at the above address. Copyright 1999 by The McGraw-Hill Companies. All rights reserved. Printed in the United States of America. Except as permitted under the Copyright Act of 1976, no part of this publication may be reproduced or distributed in any form or by any means, or stored in a database or retrieval system, without the prior written permission of the publisher, with the exception that the program listings may be entered, stored, and executed in a computer system, but they may not be reproduced for publication. Licensed Materials - Property of IBM IBM DB2 Universal Database Personal Edition, Version 5.2, for the Windows Operating Environments Copyright IBM Corp. 1993, 1998. All Rights Reserved. U.S. Government Users Restricted Rights - Use, duplication or disclosure restricted by GSA ADP schedule Contract with IBM Corp. 1999 Informix Corporation. All rights reserved. Informix is a trademark of Informix Corporation or its affiliates and is registered in the U.S. and some other jurisdictions. Microsoft SQL Server 7.0 Evaluation Edition. Copyright Microsoft Corporation, 199798. All rights reserved. Oracle8 Personal Edition 1996,1998, Oracle Corporation. All rights reserved. Copyright 1996-1998, Sybase, Inc. All rights reserved.

Advanced techniques are explored in 8, More Slow Change Techniques..