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What is IMPACT analysis?
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Impact Analysis:
If a change requested to an existing process, need to
analyse the impact on entities
Interview Purpose
-----------------
Requirement - Size of a field need to be increased in a
copybook
Before giving estimation to above requirement, we need to
do impact analysis
1. Validate the changes required to the copybook
- If FILLER (unused space) exist, use that space to
increase above field. This will save from increasing
copybook length
- If no FILLER exist in copybook, increase field length,
which will increase copybook length
2. Search for Programs used this copybook. Analyse the
usage of field in these programs. If the field value is
moving to any working storage field, start analyse the
impact of that working storage variable
- If the program is a sub-program, validate if this
field moving to main program through linkage section
variable
3. Validate the files linked to the copybook, requires file
attribute changes in the job
4. If the filed value is moving to any database, then
validate DCLGEN
5. If the value moving to any online programs, analyse if
it require any changes to online screen
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