check Flashcards
entity
field
record
table/ file
- person place or thing
- single characteristics or facts about entity
- set of related fields that describe 1 entity
- set of related records
key fields
- primary
- candidate
- foreign
- secondary
- unique minimally identifies a member
- could serve as primary
- field in one table
field or combination of field to access or retrieve recors
Entity relationship diagram (ERD)
list the entities identified and the relationships
quality assurance
- avoid problems or immediately identify them
- ## companies are intensely concern with the qualities of their podructs and services
-software/system engineering
-ISO
data mining
looks for meaningful data patterns and relationships
agile method
create a system through an iterative process of planning, designing, coding, and testing
partitioning
system broken-down into subsystems and modules
agile development
(add)
highly iterative process
corrective maintenance
diagnosis and corrects errors in operational systems
-system failure (require a path)
-when system operates again the maintenance team determines the cause and analyses problem, and designs a permanent solution
perfective maintenance
changing an operational system to make it more efficient, reliable, and maintainable
-cost effective
preventive maintainance
requires analysis of areas where trouble is likely to occur
-reduces total cost of ownership(TCO)
adaptive maintainance
-adds enhancement to and operational system
Security levels (6)
- user
- procedural
- file
- application
- network
6.physical
system changeover
4 types
process of putting new information system online an retiring the old
- direct: new system becomes operational
- parallel: both old an new operate fully
- pilot: implement new system at 1 location
- phased: implement system in. stages
