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Well difference between maintaining and generating fields is simple. Simple table
Qty Bought Price Total paid (Calculated field)
1 £3 £3
2 £4 £8
Total is calculated field so when we maintain it we use a lilttle bit of memory to save the value and it will be always there for us so anytime we need it we just look it up. This however causes some problems if say the price will change we will need to update the field or else the data would be wrong. So in a large database if you have a lot of these calculated fields besides using a lot of memory you will need to update them frequently.
If however we generate a calculted field to find out total paid it may take a little longer time for the calcultaion but it will be updated and the value will be correct. In large databases I think generating calculated fields is a much better way to get data as it will save memory and time updating them.
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