---
title: Conflict resolution
framework: coredata
role: collectionGroup
role_heading: API Collection
path: coredata/conflict-resolution
---

# Conflict resolution

Detect and resolve conflicts that occur when data is changed on multiple threads.

## Topics

### Conflict Management

- [NSConstraintConflict](coredata/nsconstraintconflict.md)
- [NSMergeConflict](coredata/nsmergeconflict.md)
- [NSMergePolicy](coredata/nsmergepolicy.md)
- [NSQueryGenerationToken](coredata/nsquerygenerationtoken.md)

## See Also

### Background tasks

- [Using Core Data in the background](coredata/using-core-data-in-the-background.md)
- [Loading and displaying a large data feed](swiftui/loading-and-displaying-a-large-data-feed.md)
- [Batch processing](coredata/batch-processing.md)