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Although it is comforting to know that in certain cases SQL Server will automatically reuse space once consumed by deleted rows, we ve just seen that it will not automatically reuse space once consumed by dropped columns. Fortunately, this space is not lost forever; we can reclaim this space by issuing a DBCC command. The DBCC CLEANTABLE command allows us to specify a database and table, and it will free up any space once consumed by dropped variable length character columns. To reclaim the space in our dbo.Test2 table, run the T-SQL command found in listing 10.

changes in frequency The incoming signal is first passed through a tunable, sensitive front end The output of the front end is mixed with the signal from a tunable, unmodulated LO Either the sum or the difference signal is amplified This is the first intermediate frequency (IF), which can be filtered to obtain a high degree of selectivity If the first IF signal is detected, the radio is a single-conversion receiver Some receivers use a second mixer and second LO, converting the first IF to a lower-frequency second IF This is a doubleconversion receiver The IF bandpass filter can be constructed for use on a fixed frequency, allowing superior selectivity and facilitating adjustable bandwidth The sensitivity is enhanced because fixed IF amplifiers are easy to keep in tune A superheterodyne receiver can intercept or generate unwanted signals False signals external to the receiver are called images; internally generated signals are called birdies If the LO frequencies are carefully chosen, images and birdies do not cause problems during ordinary operation of the receiver Figure 25-12 is a block diagram of a generic single-conversion superheterodyne receiver (Individual receiver designs vary somewhat) Here s what each stage does Front end: The front end consists of the first RF amplifier, and often includes LC bandpass filters between the amplifier and the antenna The dynamic range and sensitivity of a receiver are determined by the performance of the front end Mixer: A mixer stage converts the variable signal frequency to a constant IF The output is either the sum or the difference of the signal frequency and the tunable LO frequency IF stages: The IF stages are where most of the gain takes place These stages are also where optimum selectivity is obtained Detector: The detector extracts the information from the signal Common circuits are the envelope detector for AM, the product detector for SSB, FSK, and CW, and the ratio detector for FM Audio amplifier: Following the detector, one or two stages of audio amplification are employed to boost the signal to a level suitable for a speaker or headset Alternatively, the signal can be fed to a printer, facsimile machine, or computer.

Lower pane This pane displays two main different types of information, depending on which of the tabs at the bottom of the window is selected When the Description tab is selected, the pane displays the description of the script text you write to explain what the script is and what it does When the Event Log tab is selected, the pane displays the event log The event log contains three different categories of information, which you can switch among by clicking the three visibility buttons

--reclaim the space from the table DBCC CLEANTABLE('tempdb', 'dbo.Test2') ;

Events Click this visibility button to see the events the script has sent This helps you keep track of exactly what s happening in the script Replies Click this visibility button to see the values the script has returned for the events This information helps you see the information the script is getting Result Click this visibility button to see the result of running the script for example, which button in a dialog box the user clicked

If it succeeds, you should receive a message similar to the following as an output message in the query window.

In a superhet, the stages preceding the first mixer must be designed so they provide reasonable gain, but produce as little noise as possible They must also be capable of handling strong signals without desensitization (losing gain), also known as overloading

DBCC CLEANTABLE reclaims space from variable length columns that no longer exist as part of the table definition. In this context a variable length column can be one of the following data types: varchar, nvarchar, varchar(max), nvarchar(max), varbinary, varbinary(max), text, ntext, image, sql_variant, and xml. Now that we ve used the DBCC command to reclaim the space, let s return to our DMV query and examine the space used by the table by running listing 3.