Reloading unloaded data - Amazon Redshift

Amazon Redshift will no longer support the creation of new Python UDFs starting November 1, 2025. If you would like to use Python UDFs, create the UDFs prior to that date. Existing Python UDFs will continue to function as normal. For more information, see the blog post .

Reloading unloaded data

To reload the results of an unload operation, you can use a COPY command.

The following example shows a simple case in which the VENUE table is unloaded using a manifest file, truncated, and reloaded. 

unload  ('select * from venue order by venueid')
to 's3://amzn-s3-demo-bucket/tickit/venue/reload_' 
iam_role 'arn:aws:iam::0123456789012:role/MyRedshiftRole' 
manifest 
delimiter '|';

truncate venue;

copy venue 
from 's3://amzn-s3-demo-bucket/tickit/venue/reload_manifest' 
iam_role 'arn:aws:iam::0123456789012:role/MyRedshiftRole'
manifest 
delimiter '|';

After it is reloaded, the VENUE table looks like this: 

select * from venue order by venueid limit 5;

 venueid |         venuename         |  venuecity  | venuestate | venueseats
---------+---------------------------+-------------+------------+-----------
       1 | Toyota Park               | Bridgeview  | IL         |          0
       2 | Columbus Crew Stadium     | Columbus    | OH         |          0
       3 | RFK Stadium               | Washington  | DC         |          0
       4 | CommunityAmerica Ballpark | Kansas City | KS         |          0
       5 | Gillette Stadium          | Foxborough  | MA         |      68756
(5 rows)