Error: dynamodb scan missing values

Rafal Wilinski

Answered by Rafal Wilinski

What's Causing This Error

This error message indicates an issue with how the scan operation is used in a DynamoDB table. Specifically, it indicates that some expected values are missing in the scan results. This can happen if the scan operation is not executed correctly, the scan filter is not set up correctly, or the items being scanned do not contain the expected values.

Solution: Here's How To Resolve It

To solve this error, check the setup of the scan operation and ensure that it is executed correctly. For example, ensure that the scan filter is set up correctly and returns the expected values.

You can try to filter the scan results by using the FilterExpression property, for example:

import boto3

# Instantiate a client
dynamodb = boto3.client('dynamodb', region_name='us-west-2')

# Define the parameters
table_name = "my_table"
scan_filter = "attribute1 = :val1"
expression_attribute_values = {
  ":val1": {"S": "expected_value"}

# Perform the scan operation
results = dynamodb.scan(

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