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Note that the data volumes provided by the methods mentioned previously usually reflect the amount of disk space actually being used by databases. When creating database dumps, SQL Server 7 does not use any native compression. However, the files do compress quite well using other compression software utilities or the native hardware compression techniques that are built into many hardware devices. For some types of data, high compression ratios (above 2:1) are not uncommon. Storage space is an important consideration, so you will want to factor these compression values into your final decision. Also, as we saw in 3, the Windows NT File System (NTFS) supports the use of compression. Keep in mind that files are always decompressed when they re read from disk. Therefore, files that are compressed on the hard disk will not be stored in compressed format to tape (unless you manually allow for compression on tape). As you estimate your storage needs, a good practice is to disregard any possible data compression benefits. Even if your data compresses well now, the changing nature of data might cause it to take up much more space in the future. For example, consider backing up a website that is cur-
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rently made up of mostly static HTML files. This text-based data will compress very well. However, suppose that over time your website grows, becomes graphically intensive, and begins to include large binary files for download. These new types of files will not compress as well, and may invalidate your compression estimates. Of course, if your data compression system continues to work well for you, you'll have that much more storage room for data growth. Another popular way of increasing the manageability of company information is to provide for periodic archival of old data. The information might still be valuable, and therefore must be retained, but it may be offloaded to other types of storage. These alternative storage methods may be cheaper, but are also likely to be less convenient. We ll look at how tape and other hardware backup solutions can help with archiving data. When you are determining your data protection requirements, be sure that you omit any data that will be archived.
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As we have seen, there are several different ways to obtain information about current storage utilization. By using operating systems and database server utilities, you can gain an accurate measurement of exactly how much information you currently support. Things get considerably more complicated, however, when you must predict future requirements. Planning for the future is particularly difficult because business needs change and data protection technology is a moving target. For example, even if a database has doubled in size every six months for the last two years, there is no guarantee that it will continue to grow at this rate. Without further information, we might assume that the amount of data will explode as the business quickly grows. However, it s also likely that some of this information will be archived, and techniques such as data warehousing could offload some of these burdens. When planning for the future, you should take several factors into account: w Historical data Some say that the best way to predict the future is to learn from the past. If you have historical information on data storage requirements, you'll be better able to make an educated guess. It s likely that you ll have to make inferences, since the amount of data storage three years ago might be a fact that has been lost. One way to find some clues is to look at purchase orders and upgrade logs that show how much storage was available on servers in the past. Business plans A good indicator of the amount of data storage resources that will be required by a company is the future direction of the organization. By working with executives and managers, IT staffers can get a good picture of where the company plans to grow and shrink. For example, if marketing efforts will be increased, it s likely that more employees will be added to that department, and the databases used by that group will increase in size. Similarly, if the organization expects a division to be dissolved, storage resources might be available for other purposes.
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