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I have one table in which there would be millions of records. The requirement is to the records based on the condition and then total on one of the fields. Selectivity would be around approx 50.

Should I load 50 records in java and then filter and sum of on the field.

Or should I write an aggregate query and get the result.

This java processing can be scaled on multiple servers (Horizontal Scaling)

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If it's "just" 50 records, it won't matter much (unless your Java part is far away from the database and connected with a really low bandwidth).

But of course, for the general case, summing up values is something a database can do very well, so having the database do it will greatly reduce traffic and improve performance. And, thinking about transaction isolation, this way it's easier to get a consistent result.

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