---
title: Sync Handling
slug: best-practices/sync-handling
docTags: 
createdAt: 2024-09-11T18:44:30.962Z
---

## Sync Handling

When implementing sync in a peer-to-peer mesh network, handling synchronization efficiently is crucial. Here are some best practices for managing sync in Ditto's mesh network:

1. **Optimize Transport Usage**: Leverage multiple communication transports (Wi-Fi, Bluetooth LE, WebSockets) based on network conditions. Ditto’s multiplexer automatically manages transport switching.
2. **Query Subscription System**: Sync is query-based—only sync data relevant to each peer’s query to minimize bandwidth and processing.
3. **Conflict Resolution**: Use Ditto’s conflict-free sync, which ensures eventual consistency through deterministic resolution of concurrent edits.
4. **Flood-Fill Strategy**: For large-scale sync, Ditto uses a flood-fill process, propagating updates across the network via multihop connections. Ensure all peers share the same subscription for optimal performance.
5. **Concurrency Handling**: Utilize Ditto’s version vectors to manage updates from peers and resolve conflicts predictably.
6. **Offline-first Sync**: For offline functionality, configure an offline-first sync model that maintains data consistency even when devices are intermittently connected.

For more information, see [Mesh Networking](https://docs.ditto.live/sync/concepts/mesh-networking-101).