Unexpectedly large Realm file size

Question

This question is about using two different ways to insert objects into a Realm. I noticed that the first method is a lot faster, but the size result is huge comparing with t

Answer 1

Thanks everyone. I found an optimized way to do the task using your tips. I just did the .write, in batches instead of sending all the content in a single operation. Follows some data to compare:

Batch Size (Objects) | File Size (mb)

10.000 = 23.1mb
5.000 = 11.5mb
2.500 = 5.8mb
1.250 = 4.2mb
625 = 3.7mb
300 = 3.7mb
100 = 3.1mb
50 = 3.1mb
10 = 3.4mb
5 = 3.1mb

So in my humble opinion working with batches of 1000 is the best size / speed for this case.

Here is the code i used for this test. The only thing changed was the for 1...XXX interation.

    let realm = try! Realm(fileURL: banco_url!)

    var objects = [realm_obj]()
    var ids = incrementID()

    while (ids < 40000) {

        for i in 1...5{

            let new_realm_obj = realm_obj(value: ["id" : ids,
                                                "a": "123",
                                                "b": 12.12,
                                                "c": 66,
                                                "d": 13.13,
                                                "e": 0.6,
                                                "f": "01100110",
                                                "g": someDateTime,
                                                "h": 3])
            objects.append(new_realm_obj)
            ids += 1 
        }

        try! realm.write {
            realm.add(objects)
        }
    }