What is the most efficient way to delete a large number (10.000+) objects in Core Data?

Question

The way I\'m trying to delete multiple sets of 10.000+ NSManagedObjects is just too memory intensive (around 20MB live bytes), and my app is being jettisoned. Here is the im

Answer 1

If you do not want to use another API, try another feature of NSFetchRequest, fetchLimit, maybe in conjunction with fetchOffset. I have seen this in one of the iTunes U iPad courses in an example involving heavy number crunching with Core Data.

NSInteger limit = 500;
NSInteger count = [context countForFetchRequest:fetch error:nil];
[fetch setFetchLimit:limit];
for (int i=0; i < count/limit+1; i++) {
   // do the fetch and delete and save
}

You can adjust the fetchLimit to satisfy your memory requirements.