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POUpdate NSManagedObjects efficently in CoreData
 

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  1. POUpdate NSManagedObjects efficently in CoreData
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    <p>I have a large amount of data, saved using the Core Data Framework. There are always a lot of updates that have to be made. The Problem is that this updates take too much time.</p> <p>The reason for this is that for each entry in my database I have to make a query to get the corresponding NSObjectModel and then update its attributes. Because there is a lot of data to browse through, it takes a lot of time. If I only create new objects and insert them in my database, this takes much less time, which of course makes sense.</p> <p>So my question is if there is a more efficient way to do this, because I'm really talking about minutes, not seconds.</p> <p>Like I said, I have to get objects from the database very often. You can see it in the code below. Maybe this helps to understand where my problem is:</p> <pre><code>while (additiveElement != nil) { //Get Product Product *product = [Product productWithID:additivID inManagedObjectContext:self.managedObjectContext]; //Get ProductLanguage ProductLanguage *productLanguage = [ProductLanguage productLanguageWithLanguage:self.currentLanguage andProductID:additivID inManagedObjectContext:self.managedObjectContext]; productLanguage.language = self.languageEntity; product.productID = additivID; productLanguage.name = additivName; productLanguage.text = additivText; productLanguage.product = product; product.productFamily = [ProductFamily familyWithID:additivFamilyID inManagedObjectContext:self.managedObjectContext]; if (productFiles != nil) { File *file = [File fileWithName:fileName inManagedObjectContext:self.managedObjectContext]; file.fileName = fileName; file.fileSize = fileSize; file.fileDateNew = fileDate; file.fileType = fileType; file.language = [Language languageWithAbbreviation:@"en" inManagedObjectContext:self.managedObjectContext]; } } </code></pre>
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    1. USMoFuRo
    1. USMoFuRo
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      1. VTUpMod
    1. COProfile your app using instruments, when performing these updates. You may find that a lot of the time is spent sending and processing managed object notifications rather than database access, particularly if you are updating when you have a fetched results controller in place. Don't change any code until you know where the problem is!
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      1. POUpdate NSManagedObjects efficently in CoreData
      1. USjrturton
    2. COPost some code. Its alot easier to assist when theres code to look at. One common pitfall with large data operations is too frequent save-operations, which can be solved by processing data in chunks and being observant of notifications as jrturton prescribes.
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      1. POUpdate NSManagedObjects efficently in CoreData
      1. USEmmanuel Ay
    3. COIt's difficult to post the code for this because there are a lot of thins done. The save operation is only called at the end of the update process, so this should not be the problem.
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      1. USMoFuRo
 

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