<p> The PutAttributes operation creates or replaces attributes in an item. The client may specify new attributes using a combination of the <code>Attribute.X.Name</code> and <code>Attribute.X.Value</code> parameters. The client specifies the first attribute by the parameters <code>Attribute.0.Name</code> and <code>Attribute.0.Value</code>, the second attribute by the parameters <code>Attribute.1.Name</code> and <code>Attribute.1.Value</code>, and so on. </p> <p> Attributes are uniquely identified in an item by their name/value combination. For example, a single item can have the attributes <code>{ "first_name", "first_value" }</code> and <code>{ "first_name", second_value" }</code>. However, it cannot have two attribute instances where both the <code>Attribute.X.Name</code> and <code>Attribute.X.Value</code> are the same. </p> <p> Optionally, the requestor can supply the <code>Replace</code> parameter for each individual attribute. Setting this value to <code>true</code> causes the new attribute value to replace the existing attribute value(s). For example, if an item has the attributes <code>{ 'a', '1' }</code>, <code>{ 'b', '2'}</code> and <code>{ 'b', '3' }</code> and the requestor calls <code>PutAttributes</code> using the attributes <code>{ 'b', '4' }</code> with the <code>Replace</code> parameter set to true, the final attributes of the item are changed to <code>{ 'a', '1' }</code> and <code>{ 'b', '4' }</code>, which replaces the previous values of the 'b' attribute with the new value. </p> <note> Using <code>PutAttributes</code> to replace attribute values that do not exist will not result in an error response. </note> <p> You cannot specify an empty string as an attribute name. </p> <p> Because Amazon SimpleDB makes multiple copies of client data and uses an eventual consistency update model, an immediate <a>GetAttributes</a> or <a>Select</a> operation (read) immediately after a <a>PutAttributes</a> or <a>DeleteAttributes</a> operation (write) might not return the updated data. </p> <p> The following limitations are enforced for this operation: <ul> <li>256 total attribute name-value pairs per item</li> <li>One billion attributes per domain</li> <li>10 GB of total user data storage per domain</li> </ul> </p>

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

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