At SQL stage, what ORM wants to achieve to avoid N+1 is to fire a query that joins the two tables and get the mixed ends in single question. So we’d like one select for User and N further selects for fetching roles for each consumer, where N is whole variety of users. But attention, if many instances you do not entry related Wheels, it’s higher to maintain it LAZY or change fetch sort with Criteria. Have Two Queries – 1 for the mother or father and after you have them – query by IDs the youngsters and map them. This will reduce data switch between the DB and APP layers.
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N+1 SELECT downside is really exhausting to spot, especially in projects with large area, to the moment when it starts degrading the efficiency. Even if the problem is mounted i.e. by including keen loading, an extra improvement may break the answer and/or introduce N+1 SELECT drawback once more elsewhere.
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