It is likely that your Amazon Redshift cluster is experiencing a high number of concurrent updates, which is causing it to serialize the updates. This can happen when there are a large number of users updating the same data at the same time.
There are a few things you can do to mitigate this issue:
• Increase the number of compute nodes in your cluster. This will give your updates more resources to process concurrently.
• Partition your data into multiple tables. This will allow your updates to be processed in parallel on different tables.
• Use aColumnar Storage Format. This will allow your updates to be processed in parallel on different columns.
If you are still experiencing issues, please contact Amazon Redshift support.