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Nt1330 Unit 1 Student Information System

100 Words1 Pages
To repair the data in such environment, we confront two main challenges: 1. How to formally define the stability of the data, that is, how to measure the value in this cell is more stable than that in the other cells; 2. How to detect the violation when data continues changing.

We define the stability by generating a history relation (or it is assumed to have) w.r.t the original database. The history relation keeps track of the updates history for every cell. For example, table ef{pi} has a history relation (Table ef{hr}) that refers to $[Role, Country] = {$"President",

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