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The Executive s FAQ for Data Warehousing
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are chartered to adhere to these and then follow through even if it means that your project takes a few weeks longer If you insist on taking shortcuts, then you jeopardize the ability to maintain and deliver this consistent view of data 8 provides much more detail about what is involved in working toward a consistent view of the data
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Question: Why can t we just use our current systems
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In order to answer that question you need to understand the difference between running the business and managing the business Running the business is the regular set of activities that keeps the business going, such as keeping factories operational, processing orders, cutting checks for claim payments, ensuring that the ATM network is working, and that the airplanes are taking off These are the functions that de ne the business itself These are what keep the company running The activities that manage the business are those that track and monitor how well the business is running, and make decisions about the direction and strategy of the organization Operational reports are those that are produced from the systems that keep the business running They report the current state and help make adjustments that can be put into action right now Because the data is current, a report that shows the number of calls on hold will return different results each time it is run If too many calls are on hold, additional staff may be pulled from the break room or supervisors may handle a few calls The reports provide immediate feedback and the resulting decisions are used to keep that business function running smoothly In contrast, management reports are used to identify trends and patterns Perhaps there is higher call volume on the third Tuesday morning of every month Identifying this pattern would enable the managers to ensure that additional staff were scheduled to work that day to avoid long wait times Monitoring the overall call volume is necessary to plan for the future If business continues to grow at the current pace, then three more people will be needed by summer to handle the call volume This is important to ensure appropriate lead time to hire and train new employees Depending upon your role in the company, you may use both operational and management reports The operational reports provide guidance as to what to do now, whereas the management reports can help provide perspective so that you can plan for tomorrow, next week, and next year Most organizations already have both types of systems in place Operational applications include those that handle the general ledger, accounts payable/receivable, order processing, policy administration, claims handling,
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Part I
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travel reservations, manufacturing, and production controls Many organizations also have separate databases used to support reporting and analysis, or perhaps a full- edged data warehouse These reporting environments exist because historically the technologies were not able to handle both operational and management reporting at the same time This is one of the primary reasons that data warehousing started
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There have been signi cant advancements in technology to help address these technical challenges Databases can handle a lot more data and provide good performance Often, the data that is needed for reporting exists in more than one operational system Products have been developed to enable business rules to be set up to support integration of this data on-the- y As you hear about these advancements, it seems even more puzzling to not just use the current systems While these technologies are interesting, the real challenge is the nature and state of the data itself These technologies will only work if the organization s data can support them The following key requirements need to be met: You need to have good performance of queries to support reporting and analysis The performance of the operational application system itself must not be effected The underlying system must retain suf cient history to support the business needs The data from different systems must be aligned to integrate easily or the business rules to apply to the data must be straightforward to be done quickly on-the- y (without affecting performance of either purpose) The data must be clean and accurate There must be suf cient reference data available to support analysis from different perspectives This includes groupings and categorizations that are used for reporting but are not required to keep the transactions owing Most organizations cannot meet these key objectives by using their data directly in their operational systems, and this continues to be the case for a long time If you can t effectively use the data in your current operational systems, you need to build a data warehouse This book will help you understand what a data warehouse is and highlight the key things that need to happen to ensure its success
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