Throughout this article you have seen that there is more than one way to map object schemas to data schemas – there are four ways to map inheritance structures , two ways to map a one-to-one relationship (depending on where you put the foreign key), and four ways to map class-scope properties . Because you have mapping choices, and because each mapping choice has its advantages and disadvantages, there are opportunities to improve the data access performance of your application by changing your choice of mapping. Perhaps you implemented the one table per class approach to mapping inheritance only to discover that it’s too slow, motivating you to refactor it to use the one table per hierarchy approach.
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