LYCOS RETRIEVER 
Index: Index Tuning
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Because the recommendations of the Index Tuning Wizard are made with respect to a workload file, the single most important step is to select a workload that is representative of the database system's usage. Although tools such as SQL Profiler can help the user record a workload by logging activity on the server over a specified period of time, it is important to ensure that the logged events are representative. Furthermore, the choice of the indexes and indexed views must be reevaluated periodically. In particular, if the data volume, the data distribution, or the queries against the system change, the Index Tuning Wizard must be executed to ensure that the choice of indexes remains sound. Another important aspect to consider is that the projected reduction in the cost of the workload estimated by the index selection tool is based on a statistical summary of data. Therefore, the actual decrease or increase in cost can diverge from the estimation.
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The BetterInvesting 100 Index, which begins trading today with a benchmark value of 150.00, is the first index based on "real people's" portfolios. These investors, members of BetterInvesting-affiliated investment clubs, use a credible long-term investing methodology and a proven tool, the Stock Selection Guide, to help pick good growth companies. The organization's members report their top holdings through an annual survey conducted by BetterInvesting Magazine.
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To use the Index Tuning Wizard, the server name and the database name must be specified. In addition, the wizard requires a workload (specified as a file or a table) as its input. The goal of the Index Tuning Wizard is to recommend a physical design that best optimizes the aggregate performance of the queries and updates in the workload. Any SQL Profiler trace can be used as a workload. SQL Profiler is a graphical SQL Server client tool that makes it possible to monitor and record engine events in a file or table.
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When evaluating technologies with the Spam Index, lower scores represent the best performing technologies. The report finds that the best performing anti-spam technology is challenge-response, based on that technology's lowest average Spam Index score of 160. The 160 score is 50% less than the next lowest average score of 316 achieved by hosted services, indicating that challenge response is twice as effective as hosted services for prevention of spam. The worst performing technology was filter-based ISP solutions, with a Spam Index of 442.
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The NASDAQ-100 Index includes 100 of the largest domestic and international non-financial securities listed on The Nasdaq Stock Market based on market capitalization. The Index reflects companies across major industry groups including computer hardware and software, telecommunications, retail/wholesale trade and biotechnology. It does not contain securities of financial companies including investment companies. The NASDAQ-100 Index is calculated under a modified capitalization-weighted methodology.
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Index architectures can be classified as clustered or non-clustered. A non-clustered index normally contains a reference to a block that contains the row data for which the particular index item has been constructed. This block will hold several other rows depending on the row size. For each index lookup on a non-clustered index, a data block that houses the row sought after must ... be retrieved.
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Index Tuning