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TransactGetItems method

Written by
Updated at February 10, 2023

A synchronous operation that atomically retrieves multiple items from tables.
The output is paginated. Up to 25 objects can be returned at a time, each of which contains a Get structure. You can retrieve up to 4 MB of data per transaction.

The method can be completely rejected with the reason described in the TransactionCanceledException error message.

Request

The request contains data in JSON format.

{
   "ReturnConsumedCapacity": "string",
   "TransactItems": [
      {
         "Get": {
            "ExpressionAttributeNames": {
               "string" : "string"
            },
            "Key": {
               "string" : {
                  "B": blob,
                  "BOOL": boolean,
                  "BS": [ blob ],
                  "L": [
                     "AttributeValue"
                  ],
                  "M": {
                     "string" : "AttributeValue"
                  },
                  "N": "string",
                  "NS": [ "string" ],
                  "NULL": boolean,
                  "S": "string",
                  "SS": [ "string" ]
               }
            },
            "ProjectionExpression": "string",
            "TableName": "string"
         }
      }
   ]
}

Parameters

Parameter Description
TransactItems An ordered array of objects of the TransactGetItem type, each of which contains a Get structure.

Type: Array of TransactGetItem objects
Array items: 1-25.
Required: Yes
ReturnConsumedCapacity Indicates whether to return information about the consumed capacity.
  • TOTAL: Return.
  • NONE: Do not return.

Type: String
Possible values: TOTAL | NONE
Required: No

Response

If successful, HTTP code 200 is returned.
The response is returned in JSON format.

{
   "ConsumedCapacity": [
      {
         "CapacityUnits": number,
         "GlobalSecondaryIndexes": {
            "string" : {
               "CapacityUnits": number,
               "ReadCapacityUnits": number,
               "WriteCapacityUnits": number
            }
         },
         "LocalSecondaryIndexes": {
            "string" : {
               "CapacityUnits": number,
               "ReadCapacityUnits": number,
               "WriteCapacityUnits": number
            }
         },
         "ReadCapacityUnits": number,
         "Table": {
            "CapacityUnits": number,
            "ReadCapacityUnits": number,
            "WriteCapacityUnits": number
         },
         "TableName": "string",
         "WriteCapacityUnits": number
      }
   ],
   "Responses": [
      {
         "Item": {
            "string" : {
               "B": blob,
               "BOOL": boolean,
               "BS": [ blob ],
               "L": [
                  "AttributeValue"
               ],
               "M": {
                  "string" : "AttributeValue"
               },
               "N": "string",
               "NS": [ "string" ],
               "NULL": boolean,
               "S": "string",
               "SS": [ "string" ]
            }
         }
      }
   ]
}

Parameters

Parameter Description
ConsumedCapacity Capacity units consumed by a delete operation.
Returned only if the ReturnConsumedCapacity parameter set to TOTAL is specified in the request.

Type: Object of the ConsumedCapacity type.
Responses An ordered array of objects of the ItemResponse type.
Each object contains an associative array of key/value pairs that are attributes of the requested item.
If it isn't possible to get the item, the corresponding object's value is Null. If the item has no attributes, the corresponding object is empty.

Type: Array of ItemResponse objects
Array size: 1-25 items.

Errors

Parameter Description
InternalServerError An internal error occurred on the server side.

HTTP status code: 500
ProvisionedThroughputExceededException You're sending requests too often. Try to increase the interval between requests.
If their number is not too large, Managed Service for YDB tries to process them all.

HTTP status code: 400
RequestLimitExceeded The bandwidth exceeds the set quota.

HTTP status code: 400
ResourceNotFoundException The specified table doesn't exist.

HTTP status code: 400
TransactionCanceledException The entire request was canceled. This may happen in the following cases:
  • Another TransactGetItems operation is in progress and is in conflict with a concurrent PutItem, UpdateItem, DeleteItem, or TransactWriteItems request.
  • The allocated capacity is insufficient to complete the transaction.
  • A user error occurred, such as incorrect data format.


HTTP status code: 400

There may be common errors as well. These are errors that are common to all methods.

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