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The cancel button captures a press of the ESC key, so you ll usually want to set it to allow the user to dismiss the dialog box using the keyboard If you don t set a cancel button, the user must press TAB (or SHIFT-TAB) to put the selection ring around the appropriate button, and then press SPACEBAR to click it (when using only the keyboard)

Gone are the days of running DBCC commands and system stored procedures over and over again, and keeping links to Profiler and Performance Monitor on every machine s desktop, when trying to peek into the usage characteristics of our SQL Server instances. I hope I have provided a glimpse of how much power we have been given through DMVs and DMFs, and that I have inspired you to use them more often when observing usage or troubleshooting performance issues.

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Figure 8-8

Aaron Bertrand is the Senior Data Architect at One to One Interactive, a global marketing agency headquartered in Boston, Massachusetts. At One to One, Aaron is responsible for database design and application architecture. Due to his commitment to the community, shown through blogging at http:/ /www.sqlblog.com, peer-to-peer support on forums and newsgroups, and speaking at user group meetings and code camps, he has been awarded as a Microsoft MVP since 1998. Aaron recently published a technical white paper for Microsoft, detailing how to use the new Resource Governor feature in SQL Server 2008.

People who have switched to Microsoft SQL Server from Microsoft Access sometimes ask, If I delete a bunch of rows, do I need to compact my SQL Server database It s been many years since I ve used Access, but I still remember the reason for their concern. Access would continually add rows to the end of the table. If some, or even all, of the rows were deleted from the table, Access wouldn t reuse the space. It kept adding rows to the end of the table and never backfilled the holes. Compacting the Access database file would get rid of the holes.

Cable The earliest cables were simple wires that carried dc Nowadays, data transmission cables more often carry ac at radio frequencies One advantage of using RF is the fact that the signals can be amplified at intervals on a long span This greatly increases the distances over which data can be sent by cable Another advantage of using RF is the fact that numerous signals can be carried over a single cable, with each signal on a different frequency Cables can consist of pairs of wires, somewhat akin to lamp cords But more often coaxial cable, of the type described and illustrated at the end of Chap 10, is used This has a center conductor surrounded by a cylindrical shield The shield is grounded, and the center conductor carries the signals The shield keeps signals confined to the cable, and also keeps external EM fields from interfering with the signals Radio All radio and TV signals are electromagnetic waves The radio or TV transmitter output is coupled into an antenna system located at some distance from the transmitter The energy follows a transmission line, also called a feed line, from the transmitter output to the antenna itself Most radio antenna transmission lines are coaxial cables There are other types, used in special applications At microwaves, hollow tubes called waveguides are used to transfer the energy from a transmitter to the antenna A waveguide is more efficient than coaxial cable at the shortest radio wavelengths Radio amateurs sometimes use parallel-wire transmission lines, resembling the ribbon cable popular for use with consumer TV receiving antennas In a parallel-wire line, the RF currents in the two conductors are always 180 out of phase, so that their EM fields cancel each other This keeps the transmission line from radiating, guiding the EM field along toward the antenna The energy is radiated when it reaches the antenna The RF bands are generally categorized from very low frequency (VLF) through extremely high frequency (EHF), according to the breakdown in Table 25-1 As noted in Chap 24, the exact lower limit of the VLF range is a matter of disagreement in the literature In Table 25-1, it is defined as 3 kHz, which is consistent with defining the frequency boundaries between RF bands by order of magnitude.

You ll normally want to set a default button in each dialog box to help the user make the best choice