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it does not render UI or handle model compilation.",{"id":146,"topic":9,"difficulty":129,"body":147,"options":148,"correct_key":139,"explanation":157},"019f956d-6dca-73b3-963b-a6fd1a6c22c0","What concurrency type is the default `viewContext` (`NSPersistentContainer.viewContext`) configured with?",[149,151,153,155],{"key":133,"text":150},"`.privateQueueConcurrencyType`.",{"key":136,"text":152},"No concurrency type — it runs on whichever thread calls it",{"key":139,"text":154},"`.mainQueueConcurrencyType`",{"key":142,"text":156},"`.backgroundQueueConcurrencyType`.","`viewContext` is created with `.mainQueueConcurrencyType`, meaning it is bound to the main thread\u002Fqueue and is meant to back UI-facing fetches and edits.",{"id":159,"topic":9,"difficulty":160,"body":161,"options":162,"correct_key":142,"explanation":171},"019f956d-6dcb-72cf-8bee-1c6611b40469",2,"A developer fetches a large CSV, parses 5,000 rows, and inserts them as managed objects directly on `viewContext` on the main thread. What is the most likely observable problem?",[163,165,167,169],{"key":133,"text":164},"Core Data silently drops rows past 1,000 to protect memory.",{"key":136,"text":166},"The insert will fail to compile because `viewContext` cannot insert objects.",{"key":139,"text":168},"Nothing — `viewContext` is optimized for bulk background work.",{"key":142,"text":170},"The UI will freeze\u002Fstutter","`viewContext` runs on the main queue, so any heavy work performed on it (thousands of inserts plus the eventual save) blocks the main thread and freezes the UI; bulk imports should use a private background context instead.",{"id":173,"topic":9,"difficulty":129,"body":174,"options":175,"correct_key":133,"explanation":184},"019f956d-6dcc-71c8-93ca-854957dba892","What method creates a new background-queue-bound `NSManagedObjectContext` that is a child of the persistent container's coordinator?",[176,178,180,182],{"key":133,"text":177},"`persistentContainer.newBackgroundContext()`",{"key":136,"text":179},"`persistentContainer.viewContext.background()`",{"key":139,"text":181},"`NSManagedObjectContext.detached()`.",{"key":142,"text":183},"`persistentContainer.mainContext()`.","`newBackgroundContext()` returns a private-queue context wired to the same persistent store coordinator, intended for off-main-thread work like imports.",{"id":186,"topic":9,"difficulty":160,"body":187,"options":188,"correct_key":133,"explanation":197},"019f956d-6dcc-7af1-bae2-0ff949d7b0dd","```swift\nlet bgContext = container.newBackgroundContext()\nlet obj = bgContext.object(with: someObjectID)\nprint(obj.name) \u002F\u002F accessed directly from main thread\n```\nWhat is wrong with this code?",[189,191,193,195],{"key":133,"text":190},"The managed object belongs to a private-queue context",{"key":136,"text":192},"`object(with:)` does not exist on `NSManagedObjectContext`.",{"key":139,"text":194},"Nothing is wrong; managed objects are thread-safe by default.",{"key":142,"text":196},"`someObjectID` must be a `String`, not an `NSManagedObjectID`.","Managed objects are confined to the queue of the context that owns them. Reading `obj.name` directly from the main thread while `bgContext` is a private-queue context is a thread-confinement violation; the correct pattern wraps the access in `bgContext.perform { ... }`.",{"id":199,"topic":9,"difficulty":129,"body":200,"options":201,"correct_key":142,"explanation":210},"019f956d-6dcd-760a-b95d-a9436e8a5771","What is `NSFetchedResultsController` primarily used for?",[202,204,206,208],{"key":133,"text":203},"Compiling the `.xcdatamodeld` file at build time.",{"key":136,"text":205},"Encrypting fetch requests before they reach SQLite.",{"key":139,"text":207},"Migrating the persistent store schema between versions.",{"key":142,"text":209},"Efficiently driving a table\u002Fcollection view from Core Data results, tracking inserts\u002Fupdates\u002Fdeletes\u002Fmoves as change notifications","`NSFetchedResultsController` wraps a fetch request and observes context changes, delivering section\u002Frow-level insert\u002Fdelete\u002Fupdate\u002Fmove notifications so a table or collection view can update incrementally instead of reloading 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