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Relational databases have been around now for over 20 years, and that s precisely how long performance problems have been around too and yet here is another book on the subject It s true that this book focuses on the index design aspects of performance; however, some of the other books consider this area to a greater or lesser extent But then a lot of these books have been around for over 20 years, and the problems still keep on coming So perhaps there is a need for a book that goes beyond the usual boundaries and starts to think about why so many people are still having so many problems It s certainly true that the world of relational database systems is a very complex one it has to be if one re ects on what really has to be done to satisfy SQL statements.

Since many systems in a modern aircraft perform their functions automatically and in many instances take full control of the aircraft s ight and propulsion systems, it is essential that any detected malfunctions are instantly signalled to the crew In previous generations of aircraft, warnings were presented to the crew as individual warning lights, each with an engraved legend on the lamp lens or on the instrument panel Such warnings were rarely placed together but tended to be sited on the cockpit panels near to the controls or indicators of the system to which they related, or even wherever there happened to be suf cient space This is illustrated in the Spit re aircraft cockpit shown in Figure 81 Haphazard though this may seem, a traditional hierarchy of warnings and a philosophy of colour usage emerged.

Domain Knowledge and the Internet to descriptions physically close to the animation provided more accurate solutions on the problem-solving transfer test than those who were presented with descriptions far away on-screen from the animation. Therefore, the separation of information either by order of presentation or physical proximity impacts the formation of deeper understanding. Mayer and colleagues suggest that during the successive presentations, the learners were required to hold information they extracted from the animation in working memory, while either listening to the narration or searching for the corresponding description (Mayer & Anderson, 1991; Mayer & Anderson, 1992; Moreno & Mayer, 1999). Holding information in working memory requires cognitive resources; in such instances, therefore, less knowledgeable learners may no longer have sufficient resources to efficiently process the material, resulting in inferior learning. Although experts may be able to use their knowledge to compensate for a poorly designed multimedia presentation (Mayer, 2001), it is clear that less knowledgeable learners are challenged by poor presentations. Recall that these findings are based on research conducted in closed hypermedia environments. The Internet presents additional challenges that may exacerbate the limitations faced by less knowledgeable learners. For example, learners with limited domain knowledge may experience difficulty when using the Internet in selecting quality information from the vast amount of information available, or in identifying relevant information on the Internet (Symons & Pressley, 1993). Consequently, researchers have begun to investigate the learning outcomes of less knowledgeable learners after searching and retrieving information from the Internet in particular.

Red was used for failures requiring instant corrective action, amber was used for cautions with less need for an immediate response; blue, green or clear were used as advisory or status indications This was developed further by grouping together warnings into a single area of the cockpit or ight deck in the form of a central warning panel or master caution panel, an example of which is shown in Figure 82 The attention of the crew to the generation of a warning can be achieved by incorporating a ashing lamp or attention-getter in the direct vision of the pilot, and by using audible tones in the cockpit or on the crew headsets Bells, buzzers, electronic warbles and tones are in use on many aircraft today A hierarchy of tones is required to ensure unambiguous attention getting in circumstances where a number of warnings arise together.

Given that existing knowledge is a critical prerequisite for organizing, extracting, encoding, and retrieving information (e.g., Schneider & Weinert, 1990), it is logical to assume that individuals gathering information from the Internet would perform better in high knowledge domains in comparison to low knowledge domains. In fact, this has been reflected in children s interactions with closed hypermedia (Shin et al., 1994). Researchers have investigated the role of existing domain knowledge when learning from the Internet by examining students interaction with either a single website or the entire World Wide Web. For example, Lawless, Schrader, and Mayall (2006) restricted students to a single website that consisted of 100 pages of information which collectively comprised 11 topic areas both relevant and irrelevant to the topic 261