Lưu ý rằng các chi phí liệt kê ở trên không xem xét bất kỳ cải tiến cơ sở hạ tầng hoặc nâng cấp (ví dụ, mạng cáp hoặc nâng cấp) có thể được yêu cầu tích hợp các môi trường lưu kho vào phần còn lại của doanh nghiệp kiến trúc | Table 3-1. Typical External Cost Breakdown for a Data Warehouse Pilot Amounts expressed in US Item Min of Total Max of Total Hardware 400 000 1 000 000 Software 132 000 330 000 Services 280 000 600 000 Totals 812 000 1 930 000 Note that the costs listed above do not yet consider any infrastructure improvements or upgrades . network cabling or upgrades that may be required to properly integrate the warehousing environment into the rest of the enterprise IT architecture. What Are the Risks The typical risks encountered on data warehousing projects fall into the following categories Organizational. These risks relate either to the project team structure and composition or to the culture of the enterprise. Technological. These risks relate to the planning selection and use of warehousing technologies. Technological risks also arise from the existing computing environment as well as the manner by which warehousing technologies are integrated into the existing enterprise IT architecture. Project management. These risks are true of most technology projects but are particularly dangerous in data warehousing because of the scale and scope of warehousing projects. Data warehouse design. Data warehousing requires a new set of design techniques that differ significantly from the well-accepted practices in OLTP system development. Organizational Wrong Project Sponsor The project sponsor must be a business executive not an IT executive. Considering its scope and scale the warehousing initiative should be business driven otherwise the organization will view the entire effort as a technology experiment. A strong Project Sponsor is required to address and resolve organizational issues before these have a chance to derail the project . lack of user participation disagreements regarding definition of data political disputes . The Project Sponsor must be someone who will be a user of the warehouse someone who can publicly assume
