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The key to loading and removing data quickly from partitioned tables is to use the metadata operations of SWITCH, SPLIT, and MERGE without incurring any data movement. Data movement occurs when an operation requires that SQL Server move data from one partition to another. The SWITCH operation always requires one side of the swap to be empty; therefore, it s always a metadata operation. On the other hand, it s possible that the SPLIT and MERGE operations, if you don t use them carefully, may cause data movement. If you SPLIT a loaded partition in such a way that some of the partition s data must be moved to a new partition, data movement will occur as SQL Server moves that data to a new partition of the table. You can avoid this data movement by always using SPLIT to create new partitions that will be empty. Similarly, if you MERGE two partitions of a table and each has data, then SQL Server must move data from one of the partitions into the final partition. If this is a lot of data, a lot of inserts will occur, resulting in a lot of I/O and potentially a lot of transaction log growth during the move operation. You can avoid data movement by always using MERGE with at least one empty partition.

4 Display a dialog that shows a string including the variable:

Here are a few places you can look for more information about table partitioning: For further information about all table partitioning topics, see SQL Server Books Online, for both SQL Server 2008 and 2005. Find the Partitioned Tables category in the Books Online Index tab. For a full discussion of SQL Server 2005 table partitioning, see the white paper, Partitioned Tables and Indexes in SQL Server 2005 at http:/ /msdn.microsoft.com/en-us/library/ms345146.aspx. For using table partitioning in data warehouses, see Strategies for Partitioning Relational Data Warehouses in Microsoft SQL Server at http:/ /www.microsoft.com/technet/prodtechnol/sql/2005/spdw.mspx. Finally, for a summary of best practices for table partitioning, see Top 10 Best Practices for Building a Large Scale Relational Data Warehouse at http:/ / sqlcat.com/top10lists/archive/2008/02/06/top-10-best-practices-for-buildinga-large-scale-relational-data-warehouse.aspx.

3 An advantage of FSK over on/off keying is the fact that FSK (a) offers better frequency stability (b) can provide faster data rates (c) reduces the number of receiving errors (d) Forget it! On-off keying is just as good as FSK 4 The highest layer of the ionosphere is (a) the D layer (b) the E layer (c) the F layer (d) none of the above 5 If an AM signal is modulated with audio having frequencies up to 5 kHz, then what is the complete signal bandwidth (a) 10 kHz (b) 20 kHz (c) 50 kHz (d) 500 kHz 6 An LSB, suppressed-carrier signal can be demodulated by (a) an envelope detector (b) a diode (c) a ratio detector (d) a product detector 7 Which of the following modes is used to send image data over telephone lines (a) On/off keying (b) Fax (c) AM (d) Product detection 8 The S/N ratio is a measure of (a) the sensitivity of a receiver (b) the selectivity of a receiver (c) the dynamic range of a receiver (d) the efficiency of a transmitter 9 Suppose an SSB suppressed carrier is at 14335 MHz, and audio data is contained in a band from 14335 to 14338 MHz What is this mode (a) DSB (b) LSB (c) USB (d) AFSK

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Summary

Table partitioning is quite an involved topic, and in this chapter we only scratched the surface, but I hope we highlighted a couple of the most important bumps! These are the key takeaways:

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10 A receiver that responds to a desired signal, but not to another signal very close by in frequency, has good (a) sensitivity (b) noise figure (c) dynamic range (d) selectivity 11 Fill in the blank in the following sentence to make it true: The deviation of a narrowband voice FM signal normally extends up to either side of the unmodulated-carrier frequency (a) 3 kHz (b) 5 kHz (c) 10 kHz (d) 3 MHz 12 An FM detector with built-in limiting is (a) a ratio detector (b) a discriminator (c) an envelope detector (d) a product detector 13 In which mode of PM does the peak power level of the pulses vary (a) PAM (b) PDM (c) PIM (d) PFM 14 A continuously variable signal (such as music audio) can be recovered from a signal having only a few discrete levels or states by means of (a) a ratio detector (b) a D/A converter (c) a product detector (d) an envelope detector 15 In which mode are signals intertwined in the time domain at the transmitter, and then separated again at the receiver (a) FDM (b) AFSK (c) PCM (d) None of the above 16 Which of the following modes can be demodulated with an envelope detector (a) AM (b) CW