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**Example 1: To write items atomically to one or more tables**

The following ``transact-write-items`` example updates one item and deletes another. The operation fails if either operation fails, or if either item contains a ``Rating`` attribute. ::

    aws dynamodb transact-write-items \
        --transact-items file://transact-items.json \
        --return-consumed-capacity TOTAL \
        --return-item-collection-metrics SIZE

Contents of the ``transact-items.json`` file::

    [
        {
            "Update": {
                "Key": {
                    "Artist": {"S": "Acme Band"},
                    "SongTitle": {"S": "Happy Day"}
                },
                "UpdateExpression": "SET AlbumTitle = :newval",
                "ExpressionAttributeValues": {
                    ":newval": {"S": "Updated Album Title"}
                },
                "TableName": "MusicCollection",
                "ConditionExpression": "attribute_not_exists(Rating)"
            }
        },
        {
            "Delete": {
                "Key": {
                    "Artist": {"S": "No One You Know"},
                    "SongTitle": {"S": "Call Me Today"}
                },
                "TableName": "MusicCollection",
                "ConditionExpression": "attribute_not_exists(Rating)"
            }
        }
    ]

Output::

    {
        "ConsumedCapacity": [
            {
                "TableName": "MusicCollection",
                "CapacityUnits": 10.0,
                "WriteCapacityUnits": 10.0
            }
        ],
        "ItemCollectionMetrics": {
            "MusicCollection": [
                {
                    "ItemCollectionKey": {
                        "Artist": {
                            "S": "No One You Know"
                        }
                    },
                    "SizeEstimateRangeGB": [
                        0.0,
                        1.0
                    ]
                },
                {
                    "ItemCollectionKey": {
                        "Artist": {
                            "S": "Acme Band"
                        }
                    },
                    "SizeEstimateRangeGB": [
                        0.0,
                        1.0
                    ]
                }
            ]
        }
    }

For more information, see `Managing Complex Workflows with DynamoDB Transactions <https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/transactions.html>`__ in the *Amazon DynamoDB Developer Guide*.

**Example 2: To write items atomically using a client request token**

The following command uses a client request token to make the call to ``transact-write-items`` idempotent, meaning that multiple calls have the same effect as one single call. ::

    aws dynamodb transact-write-items \
        --transact-items file://transact-items.json \
        --client-request-token abc123

Contents of the ``transact-items.json`` file::

    [
        {
            "Update": {
                "Key": {
                    "Artist": {"S": "Acme Band"},
                    "SongTitle": {"S": "Happy Day"}
                },
                "UpdateExpression": "SET AlbumTitle = :newval",
                "ExpressionAttributeValues": {
                    ":newval": {"S": "Updated Album Title"}
                },
                "TableName": "MusicCollection",
                "ConditionExpression": "attribute_not_exists(Rating)"
            }
        },
        {
            "Delete": {
                "Key": {
                    "Artist": {"S": "No One You Know"},
                    "SongTitle": {"S": "Call Me Today"}
                },
                "TableName": "MusicCollection",
                "ConditionExpression": "attribute_not_exists(Rating)"
            }
        }
    ]

This command produces no output.

For more information, see `Managing Complex Workflows with DynamoDB Transactions <https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/transactions.html>`__ in the *Amazon DynamoDB Developer Guide*.

Filemanager

Name Type Size Permission Actions
wait Folder 0755
batch-get-item.rst File 1.95 KB 0644
batch-write-item.rst File 2.92 KB 0644
create-backup.rst File 860 B 0755
create-global-table.rst File 1.03 KB 0755
create-table.rst File 22.02 KB 0644
delete-backup.rst File 1.85 KB 0755
delete-item.rst File 2.8 KB 0644
delete-table.rst File 789 B 0644
describe-backup.rst File 1.89 KB 0755
describe-continuous-backups.rst File 745 B 0755
describe-contributor-insights.rst File 1.14 KB 0644
describe-endpoints.rst File 542 B 0755
describe-global-table-settings.rst File 1.55 KB 0755
describe-global-table.rst File 952 B 0755
describe-limits.rst File 576 B 0755
describe-table-replica-auto-scaling.rst File 4.11 KB 0755
describe-table.rst File 1.41 KB 0644
describe-time-to-live.rst File 551 B 0755
get-item.rst File 3.17 KB 0644
list-backups.rst File 7.38 KB 0644
list-contributor-insights.rst File 3.33 KB 0644
list-global-tables.rst File 739 B 0755
list-tables.rst File 2.79 KB 0644
list-tags-of-resource.rst File 2.34 KB 0644
put-item.rst File 2.68 KB 0644
query.rst File 6.88 KB 0644
restore-table-from-backup.rst File 2.17 KB 0755
restore-table-to-point-in-time.rst File 2.05 KB 0755
scan.rst File 1.48 KB 0644
tag-resource.rst File 510 B 0755
transact-get-items.rst File 2.02 KB 0644
transact-write-items.rst File 3.98 KB 0644
untag-resource.rst File 521 B 0755
update-continuous-backups.rst File 908 B 0755
update-contributor-insights.rst File 780 B 0644
update-global-table-settings.rst File 2.15 KB 0755
update-global-table.rst File 1.06 KB 0755
update-item.rst File 3.39 KB 0644
update-table-replica-auto-scaling.rst File 6.29 KB 0755
update-table.rst File 14.27 KB 0644
update-time-to-live.rst File 585 B 0755