Error: DynamoDB sorting is not supported for scan expressions

Rafal Wilinski

Answered by Rafal Wilinski

What's Causing This Error

The error DynamoDB sorting not supported for scan expressions is caused because DynamoDB scans do not support sorting the results. A scan operation reads all items in a table and does not support any sorting options.

Solution: Here's How To Resolve It

To retrieve sorted data from a DynamoDB table, you can use the Query operation instead of the Scan operation. The Query operation allows you to retrieve items from a table with a specific partition key, and you can also use the sort key to specify the order in which the items are returned.

  • Another solution is to retrieve all the data using a scan and then sort it using your application.
  • You can also use DynamoDB Global Secondary Indexes (GSIs) to sort the data based on different attributes, and you can then query the GSI to retrieve the sorted data.
  • If you need to retrieve all the data from a table and sort it, it may be more efficient to export the data to another data store that supports sorting, such as Amazon Redshift, and then perform the sort there.
  • It is important to understand that scan operation is not designed to return sorted data, so you should use a query or global secondary indexes (GSIs) to achieve this.

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