Currently working as a contractor, mostly on Node.js and Typescript, also React.
Also have a background in academia, I have a PhD in CS and worked as a researcher in AI.
.AsNoTracking() isn't related to lazy-loading, it's a way of saying to EF that you don't want it to keep track of those entities. This means that if you make changes to them, those changes won't be persisted when you call .SaveChanges().
Also, if you do something like foreach (var order in cust.Orders) you are not going to end up with a fetch per iteration. There's only going to be 1 db call (adding .ToList() makes no difference in this case). The way you end up with N+1 is if Orders is lazy loaded and you do something like this:
foreach (var cust in customers)
{
foreach (var order in cust.Orders) //one db call per customer for the orders
{
}
}
You are absolutely right about having to really dig deep into the ORM that you are using. Lazy loading and N+1 problems are just one of the ways you can shoot yourself in the foot. Another that comes to mind is validation introducing performance issues when doing bulk inserts.
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Hi Daniel,
.AsNoTracking()isn't related to lazy-loading, it's a way of saying to EF that you don't want it to keep track of those entities. This means that if you make changes to them, those changes won't be persisted when you call.SaveChanges().Also, if you do something like
foreach (var order in cust.Orders)you are not going to end up with a fetch per iteration. There's only going to be 1 db call (adding .ToList() makes no difference in this case). The way you end up with N+1 is if Orders is lazy loaded and you do something like this:You are absolutely right about having to really dig deep into the ORM that you are using. Lazy loading and N+1 problems are just one of the ways you can shoot yourself in the foot. Another that comes to mind is validation introducing performance issues when doing bulk inserts.