Error: DynamoDB sorting is not supported for scan expressions
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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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