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# CKOperationGroup

An explicit association between two or more operations.

```
class CKOperationGroup
```

## Overview

In certain situations, you might want to perform several CloudKit operations together. Grouping operations in CloudKit doesn’t ensure atomicity.

For example, when building a Calendar app, you group the following actions:

- Fetch records from CloudKit, which consists of numerous queries that fetch both new records and records with changes.
- Perform incremental fetches of records in response to a push notification.
- Update several records when the user saves a calendar event.

Associate operation groups with operations by setting their [`group`](/documentation/CloudKit/CKOperation/group) property. Create a new operation group for each distinct user interaction.

## Topics

### Creating an Operation Group

[`init()`](/documentation/CloudKit/CKOperationGroup/init())

Creates an operation group.

[`init(coder:)`](/documentation/CloudKit/CKOperationGroup/init(coder:))

Creates an operation group from a serialized instance.

### Configuring an Operation Group

[`defaultConfiguration`](/documentation/CloudKit/CKOperationGroup/defaultConfiguration)

The default configuration for operations in the group.

[`expectedReceiveSize`](/documentation/CloudKit/CKOperationGroup/expectedReceiveSize)

The estimated size of traffic to download from CloudKit.

[`expectedSendSize`](/documentation/CloudKit/CKOperationGroup/expectedSendSize)

The estimated size of traffic to upload to CloudKit.

[`name`](/documentation/CloudKit/CKOperationGroup/name)

The operation group’s name.

[`operationGroupID`](/documentation/CloudKit/CKOperationGroup/operationGroupID)

The operation group’s unique identifier.

[`quantity`](/documentation/CloudKit/CKOperationGroup/quantity)

The number of operations in the operation group.

[`CKOperationGroup.TransferSize`](/documentation/CloudKit/CKOperationGroup/TransferSize)

Constants that represent possible data transfer sizes.


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