Compare & Sync

Compare & Sync lets you compare the contents of two collections — even across different servers — and synchronize the differences.

Starting a Comparison

Open Compare & Sync from the sidebar tools section or from a collection's context menu:

1. Select the source collection (connection, database, and collection)
2. Select the target collection (can be on a different server)
3. Click Compare

Comparison Results

The comparison shows:

• Documents only in source — exist in source but not in target
• Documents only in target — exist in target but not in source
• Different documents — exist in both but have different field values
• Identical documents — matching documents (optionally hidden)

Documents are compared by their _id field by default.

Synchronizing

After reviewing the differences, select which changes to apply:

• Copy to target — insert missing or update different documents in the target
• Copy to source — insert missing or update different documents in the source
• Delete from target — remove documents that don't exist in the source

The sync wizard guides you through the process with a preview of all changes before they are applied.

Use Cases

• Keeping development and staging databases in sync
• Verifying data migrations
• Comparing data across replica set members
• Auditing data changes between environments