Project phased delivery
Oracle Tips by Burleson Consulting
The Data Warehouse Development Life Cycle
The Project Delivery Schedule
Unlike many traditional information system projects where a new
system is being developed to replace a legacy system, the data
warehouse project does not need to have a firm delivery date. In
fact, most successful data warehouse project follow an iterative
delivery schedule, where small pieces of the data warehouse are
delivered, one at a time, widening in scope, until the completed
warehouse is delivered (see Figure 2.5).
Figure 2.5 A phased delivery schedule for a data warehouse.
As you can see in Figure 2.5, small pieces of the data warehouse can
be delivered independently from other pieces. In general, the slices
of the data warehouse fall into two categories: data slices and
function slices. For example, a data warehouse manager may be able
to deliver the sales data for 1995 through 1997 to end-user managers
within six months, and then, while the end-users use the 1995-97
data, the 1993-94 data can be extracted and loaded into the data
warehouse. In addition, functional delivery partitioning is common
for the data warehouse. Cross-tabulations of summary data
(multidimensional displays) can be delivered quickly so that
end-users can use this functionality, while the warehouse team
completes the simulation and modeling components of the data
When the overall project delivery schedule is examined, designers
often notice many opportunities for concurrent development exist, as
shown in Figure 2.6. In this Gantt chart, you can see how the
development of the end-user interface can proceed at the same time
as the data extraction and cleaning processes are performed. The
effective application of human resources to these types of
concurrent tasks is called crashing a project, and it has been
demonstrated that data warehouse projects have many opportunities to
accelerate the delivery times.
Figure 2.6 Gantt chart for a data warehouse project.
This is an excerpt from "High Performance
Data Warehousing", copyright 1997.
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