What is data inconsistency?

Data inconsistency exists when different and conflicting versions of the same data appear in different places. Data inconsistency creates unreliable information, because it will be difficult to determine which version of the information is correct. (It's difficult to make correct - and timely - decisions if those decisions are based on conflicting information.) Data inconsistency is likely to occur when there is data redundancy.

Data redundancy occurs when the data file/database file contains redundant unnecessarily duplicated - data. That's why one major goal of good database design is to eliminate data redundancy.

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