Databases Reference
In-Depth Information
Exhibit 38-1. The four steps in relational conversion.
Nevertheless, entire applications programs must be gradually rewritten
using relational database programming. Online transaction programs using
4GLs can be easily developed to collect data about events or transactions.
A new relational database that uses visual4GL components to retrieve
information or generate reports should also be opened for end-user com-
puting. The conversion of the update programs then progresses to the final
phase. CASE tools can be used to isolate update logic from other modules
during the conversion process.
Finally, documentation of relational-specific policies and procedures is
finalized. The documentation is actually a by-product of the conversion
process. Among the most important components are careful planning, the
resolution of strategic issues, and the adequate training of systems devel-
opment professionals in the use of CASE tools.
RECOMMENDED COURSE OF ACTION
As in making any decisions that can have a large impact on an organiza-
tion's operations and culture, systems development managers must weigh
the pros and cons of relational and nonrelational database technology. To
review, factors against converting to relational databases include:
• Relational database access can be slower.
• Relational database processing can be inefficient.
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