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Asked: 2026-06-03T05:04:04+00:00

I have recently had several situations where I need different data from the same

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I have recently had several situations where I need different data from the same table. One example is where I would loop through each “delivery driver” and generate a printable PDF file for each customer they are to deliver to.

In this situation, I pulled all customers and stored them into 

List<Customer> AllCustomersList = customers.GetAllCustomers();

As I looped through the delivery drivers, I’d do something like this:

List<Customer> DeliveryCustomers = AllCustomersList.Where(a => a.DeliveryDriverID == DriverID);

My question: Is the way I’m doing it by querying the List object faster than querying the database each time for customer records associated with the delivery driver?

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  1. Editorial Team

    There isn’t an accurate number for amount of rows that if you pass it you should query the DB instead in in-memory List<T>

    But the rule of thumb is, DB are designed to work with large amount of data and they have optimization “mechanisms” while in in-memory there aren’t such things.

    So you will need to benchmark it to see if the round-trip to DB is worth it for that amount of rows for each time it’s important to you

    “We should forget about small efficiencies, say about 97% of the time: premature
    optimization is the root of all evil    “

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