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# database

The database that the operation uses.

```
var database: CKDatabase? { get set }
```

## Discussion

For operations that you execute in a custom queue, use this property to specify the target database. Setting the database also sets the corresponding container, which it inherits from [`CKOperation`](/documentation/CloudKit/CKOperation). If this property’s value is `nil`, the operation targets the user’s private database.

The default value is `nil`.

---

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