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One of the most time-consuming of all database tasks is installing, configuring, patching, and upgrading SQL Server instances. Although it might sound like an easy task, it usually isn t. One of the difficulties is finding a good time to perform such work, especially in 24/7 shops. In addition, each time SQL Server is patched or upgraded, there is the risk that after the patch or upgrade the applications that access the database, or the databases themselves, might not work properly. On top of this, DBAs often have to battle third-party vendors who are unwilling to certify that their application will work after you have made the changes. This requires the completion of planning, testing, and backout preparation before implementing major changes.

The acronym MOSFET (pronounced moss-fet ) stands for metal-oxide-semiconductor field effect transistor A simplified cross-sectional drawing of an N-channel MOSFET, along with the schematic symbol, is shown in Fig 23-7 The P-channel device is shown in the drawings of Fig 23-8

You can place the Tell Application pop-up menu in the navigation bar by selecting the Show Tell Application Pop-Up Menu in Editing preferences

Over time, the load put on individual databases changes. DBAs are responsible for monitoring workloads and figuring out how to maximize hardware resources to get the best SQL Server performance. This may involve moving a database from a heavily loaded server to a server with a lighter load. SQL Server virtualization, and how it can benefit load balancing, is becoming a hot topic for many DBAs. For more information on SQL Server virtualization, see chapter 39, Running SQL Server on Hyper-V, by John Paul Cook.

Writing and maintaining documentation is probably the most boring and loathed task that a DBA will encounter. However boring, it is a critical part of the DBA s job. If you don t document, then there is no easy way to rebuild the current infrastructure should major problems arise.

You can then click this pop-up menu and choose the application to which you want to direct the script (see Figure 3-3) This saves you from having to write a tell block around your whole script while you re working in AppleScript Editor

Extremely High Input Impedance When the MOSFET was first developed, it was called an insulated-gate FET or IGFET That s still a good name for it The gate electrode is insulated from the channel by a thin layer of dielectric material As a result, the input impedance is even higher than that of a JFET The gate-to-source resistance of a typical MOSFET is, as a matter of fact, comparable to that of a typical capacitor! This means that a MOSFET draws essentially no current, and therefore no power, from the signal source This makes the device ideal for low-level and weak-signal amplifiers But MOS devices aren t quite perfect They have an Achilles heel They are electrically fragile

MANAGING PEOPLE Many DBAs find themselves in management positions, such as a senior DBA in charge of junior DBAs. Some DBAs at large organizations do this full time, whereas others

Often, it s helpful to add notes to your code as you write a script for example, noting what works and what doesn t, what you need to do next, and other approaches you re considering to getting the job done When a script is complete, it s a good idea to write notes that make the script easy to understand for someone who s never seen it before AppleScript calls such notes comments and lets you add them to your scripts in two ways: as end-of-line comments and block comments

combine people management with other DBA duties. On the other hand, when some DBAs get a taste of management, they give it up to get back to more technical work. Managing people is not for everyone.