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A dimension table is highly denormalized, which means it contains repeated data and full text descriptions, rather than key values which join to other tables A dimension table contains columns which fully describe the item, and each row represents a unique item For example, an individual product exists in a product hierarchy The hierarchy consists of the levels Product Category, Product Subcategory, Product Group, and SKU A specific computer mouse might be in the Product Category Hardware, the Product Subcategory Peripherals, the Product Group Mice, with the individual product existing at the SKU level There are also other columns that more fully describe the product and might include information such as color, price, weight, height, width, product code, and more

Frankly, yes! Any business with personnel in the field or any business where efficient use of resources can reduce operating costs and increase profits will benefit from two-way radio Now that doesn t leave out too many businesses, does it In fact, hundreds of businesses, of all sizes and types, have mobile radios in use, and the list grows with each year Police departments, delivery services, Realtors, school systems, industrial plants, farmers, repair services, construction companies, contractors, vending companies, and many more organizations save time and money through the continued use of two-way radios

FIGURE 2-6

The three most commonly used satellite frequency bands are the C-band, Ku-band, and Ka-band C-band and Ku-band are the two most common frequency spectrums used by today s satellites To help understand the relationship between antenna diameter and transmission frequency, it is important to note that there is an inverse relationship between frequency and wavelength when frequency increases, wavelength decreases As wavelength increases, larger antennas are required to receive the signal C-band satellite transmissions occupy the 4 to 8 GHz frequency ranges These relatively low frequencies translate to larger wavelengths than Ku-band or Ka-band These larger wavelengths of the C-band mean that a larger satellite antenna is required to gather the minimum signal strength The minimum size of an average C-band antenna is approximately 2 3 meters in diameter as shown in Figure 24-2

The values for such items as the Product Category and Product Subcategory are stored as text in the dimension table This is the part of a dimension table that is denormalized; the data is repeated many times instead of minimizing storage using relational techniques This may seem wasteful, but as will be shown later, the storage used by dimension tables is minor in the overall scheme of the warehouse Due to restrictions on page size, the columns of a single record are broken into multiple pieces Table 3-1 shows several records as they would appear in the dimension table Note that in some cases, architects do normalize dimension tables somewhat In this case, one separate table might be made for Product Category and another for Product Subcategory This design is called a snowflake schema and is sometimes seen in large warehouses There is little space savings overall because, as previously mentioned, dimension tables take up only a very small portion of the storage of a warehouse In addition, the building of the cubes, to be described later, is slightly slower due to the need to perform joins However, once the cube is built, there is no performance penalty from creating a snowflake schema Conformed Dimensions A special consideration is that of conformed dimensions Since most companies start with data marts, they end up with a number of different structures for those different marts One key element in bringing various marts together into a warehouse is to have the same dimension structure across those marts The structure of the employee dimension in an HR data mart should match the structure of the employee dimension in the Sales data mart, for example Therefore, it is important to

A robot being repaired between matches at a BotBash tournament (courtesy of Andrew Lindsey)

Figure 24-2: C-band satellite antenna Ku-band satellite transmissions occupy the 11 to 17 GHz frequency ranges These relatively high frequency transmissions correspond to shorter wavelengths, and therefore a smaller antenna can be used to receive the minimum signal strength Ku-band antennas can be as small as 18 inches in diameter Figure 24-3 shows the Ku-band antenna