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As with read-only users, read-write users should be prevented from accessing information outside of their application They should also be prevented from manipulating the data objects themselves The third category of users is the application administrator or application developer, who are included together because the access they require is generally the same The administrator/developer (Figure 1-4) will need to create, update, and delete objects as well as data Configurations and some levels of fine-grained access controls for the application may also be required This person s job is focused around an application, and they should not necessarily have free access to all information in the database Lastly, we want to consider the DBA, As you know, the DBAs are generally concerned about the health and welfare of the database Due to the enormous amounts of jobs and activities DBAs need to perform, they generally have superuser access that allows them to access any part of the database and do anything necessary These four user profiles are meant to serve as a top-level grouping of user accounts By thinking about the security implications to each of the user profiles, you can immediately decide what risks you will undertake by using dedicated or shared accounts as well as find easy ways to simplify designs and design discussions Note that if you decide to share accounts, you will want to seriously consider the suggestions in the database vault chapters (s 4 to 7), which will allow you to share accounts securely and maintain accountability

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Grounded-cathode RF power amplifiers can (and sometimes do) oscillate, unless they are neutralized or provided with some negative feedback The oscillation usually occurs at some frequency far removed from the operating frequency Known as parasitic oscillation, it can rob the amplifier of output power at the desired frequency, as well as causing interference to communications on the frequency or frequencies of oscillation Neutralization can be a tricky business When the tube is replaced, the neutralizing circuit must be readjusted The adjustment is rather critical Improved stability, without the need for neutralization, can be obtained by grounding the grid, rather than the cathode, of the tube in an RF power amplifier The grounded-grid configuration requires more driving power than the groundedcathode scheme While a grounded-cathode amplifier might produce 1 kW of RF output for 10 W input, a grounded-grid amplifier needs about 50 W to 100 W of driving power to produce 1 kW of RF output A simple grounded-grid RF power amplifier is shown in Fig 29-6 The cathode input impedance is low, and the plate output impedance is high The output impedance is matched by the same means as with the grounded-cathode arrangement In Fig 29-6, a transformer is used between the plate circuit and the load Plate voltages in the circuits of Figs 29-5 and 29-6 are given only as examples The amplifiers shown would produce perhaps 75 W to 150 W of RF power output An amplifier with 1 kW of RF output would have a plate voltage of 2 to 5 kV, depending on the tube characteristics and the class of amplifier operation Typical grounded-grid linear amplifiers are operated in class-AB or B If linearity is not important (as in CW, FSK, or FM operation), then class-C provides improved efficiency, although the driving power requirement increases, so that 100 W or even 200 W of RF input is necessary to get 1 kW of RF output.

A large part of this book is dedicated to conveying best practices and methodologies to assist you in designing and developing secure database applications To that end, coming up with a predictable and consistent naming convention for your database schemas will prove invaluable A sound naming convention will allow you to collaborate more easily and mitigate confusion for yourself and others A good way to start with naming is to give the database account/schema the same name or abbreviation for the application module in which it serves For example, the sales history objects could be contained in the SH schema, and the order entry objects could be contained in the OE schema

Figure 9-1

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