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Although you do n't have to define a primary key for a table , if you plan on referencing that table , there are many reasons why the primary key is important , even if you think irrelevant data entry is handled at the front end . Anderson introduced the concept through speeches and articles in Wired and eventually expanded upon it in a book , " The Long Tail : Why the Future of Business is Selling Less of More , " in 2006 . Because they rely on Web bugs , DidTheyReadIt and similar tracking programs can only track HTML messages . Opinion : Scalix possibly a serious contender to Exchange ( ZDNet ) This columnist believes that Scalix , if it continues on its current path , should make " Microsoft management quake in their boots . After the personal computer arrived with its own self-sufficient operating system and applications , it gradually replaced the 3270 system in much of the corporate world ( although there almost certainly are some working 3270s in use as this is being written ) . When the collectors are warmer than the tank , the control turns on a circulator which circulates a heat-transfer fluid , usually water or a water-glycol mixture , through the collectors and back to the heat exchanger located in or adjacent to the storage tank . From an introduction to data quality-related terms to understanding the innovations in tools and technology , this is your best resource for getting started on the right foot with your data quality initiative . Many of the rivers in the Northeast dry out in the summer because too much water is drawn from them . It is not recommended that you retaliate in kind because such behavior can lead to civil actions or criminal charges against you . Developed over the past 50 years , this impressive engineering system of locks , sluices , channels , bridges , slides , and storm-surge barriers was built after the catastrophic floods of 1953 to protect southwestern Holland from the encroaching North Sea . In recent years , corporate governance has received increased attention because of high-profile scandals involving abuse of corporate power and , in some cases , alleged criminal activity by corporate officers . According to legend , the idea occurred to Davis after he saw a number of jargon terms on a blackboard in a colleague 's office . After looking at the outline , change it around as much as you want until it fits your writing needs . The recovery time objective ( RTO ) is the maximum tolerable length of time that a computer , system , network , or application can be down after a failure or disaster occurs . Upon your return to Amsterdam , the balance of the afternoon is at leisure . The well-designed technical backbone of an SOA helps deliver upon the promise of reduced maintenance costs and better interoperability , but it is the application and management of the technology that delivers bottom-line productivity benefits . They ca n't implement it just because they think it will help keep customers satisfied . Upon successful completion of the registration process , you will see a welcome page with links to sign up for alumni email forwarding and to update your information in the online directory . Our Security School not only provides CISSP certification education with a thorough overview of the topics covered in the exam , it also doubles as a comprehensive security resource that enables proactive security professionals on all levels to keep their skills ahead of the pack . E.g ., plastic bottles cannot be made into new plastic bottles , because recycled plastic is of lower quality . Project organizers hope to achieve their goals by 2011 , after which they expect to update the information annually .