Best practices for handling data persistence in a scalable Swift application
I've been banging my head against this for hours. Building an application that needs to handle large volumes of user data, I'm trying to figure out the best way to ensure data persistence while maintaining performance as the app scales. Currently, I'm using Core Data for local storage, but I'm concerned about its limitations with complex queries and large datasets. I've implemented basic CRUD operations, but now I'm exploring options for batch processing and background data fetching. Here's a snippet of what I’ve set up so far: ```swift import CoreData class DataManager { static let shared = DataManager() let persistentContainer: NSPersistentContainer private init() { persistentContainer = NSPersistentContainer(name: "MyApp") persistentContainer.loadPersistentStores(completionHandler: { (storeDescription, error) in if let error = error as NSError? { fatalError("Unresolved error \(error), \(error.userInfo)") } }) } func saveContext() { let context = persistentContainer.viewContext if context.hasChanges { do { try context.save() } catch { let nserror = error as NSError fatalError("Unresolved error \(nserror), \(nserror.userInfo)") } } } } ``` I've also been reading about using Combine for handling asynchronous updates and potentially replacing traditional delegate patterns. This could help keep the UI responsive as data updates in the background. However, I'm unsure how to effectively integrate Combine with Core Data, especially when dealing with changes in large datasets. Additionally, I stumbled upon suggestions for using REST APIs with JSON for remote data synchronization. While this does provide flexibility, I'm worried about the overhead and performance implications of frequent network calls. Has anyone had success balancing local persistence and remote data fetching without sacrificing app responsiveness? Any advice on structuring the data layer to facilitate easier scaling in the future would be invaluable. Specifically, techniques for optimizing Core Data queries or integrating other persistence solutions like Realm or SQLite could help with our scalability concerns. This is my first time working with Swift 3.10. Could this be a known issue? The stack includes Swift and several other technologies.