In fact, much of the early
growth in personal computers was tied to the use of spreadsheets that performed
analyses using data downloaded from the operational systems. Business executives
began to direct IT efforts toward building solutions to better understand the business
using such data leading to new business strategies. Today, solutions are
commonly provided in business areas such as customer relationship management,
sales and marketing campaign analysis, product management and packaging, financial
analysis, supply chain analysis, and risk and fraud analysis.
In the 1980s, many organizations began using dedicated servers for these applications,
collectively known then as decision support systems (DSS), supplementing their
management information systems. Decision-support queries tended to be particularly
CPU and memory intensive using read-only data, whereas traditional OLTP was
typically I/O intensive with a large number of updates to data. The characteristics of
queries were much less predictable (e.g., more ???ad hoc???) than what had been experienced
in OLTP systems.
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