<p>The <code>Scan</code> operation returns one or more items and item attributes by accessing every item in a table or a secondary index. To have DynamoDB return fewer items, you can provide a <code>FilterExpression</code> operation.</p> <p>If the total number of scanned items exceeds the maximum dataset size limit of 1 MB, the scan stops and results are returned to the user as a <code>LastEvaluatedKey</code> value to continue the scan in a subsequent operation. The results also include the number of items exceeding the limit. A scan can result in no table data meeting the filter criteria. </p> <p>A single <code>Scan</code> operation reads up to the maximum number of items set (if using the <code>Limit</code> parameter) or a maximum of 1 MB of data and then apply any filtering to the results using <code>FilterExpression</code>. If <code>LastEvaluatedKey</code> is present in the response, you need to paginate the result set. For more information, see <a href="https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/Scan.html#Scan.Pagination">Paginating the Results</a> in the <i>Amazon DynamoDB Developer Guide</i>. </p> <p> <code>Scan</code> operations proceed sequentially; however, for faster performance on a large table or secondary index, applications can request a parallel <code>Scan</code> operation by providing the <code>Segment</code> and <code>TotalSegments</code> parameters. For more information, see <a href="https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/Scan.html#Scan.ParallelScan">Parallel Scan</a> in the <i>Amazon DynamoDB Developer Guide</i>.</p> <p> <code>Scan</code> uses eventually consistent reads when accessing the data in a table; therefore, the result set might not include the changes to data in the table immediately before the operation began. If you need a consistent copy of the data, as of the time that the <code>Scan</code> begins, you can set the <code>ConsistentRead</code> parameter to <code>true</code>.</p>

{
  "success": true,
  "data": {
    "id": "abc123",
    "created_at": "2025-01-01T00:00:00Z"
  }
}

{
  "success": false,
  "error": {
    "code": "VALIDATION_ERROR",
    "message": "Invalid request parameters"
  }
}