Use SYS_UNLOAD_DETAIL to view details of an UNLOAD operation. It records one row for each file created by an UNLOAD statement. For example, if an UNLOAD creates 12 files, SYS_UNLOAD_DETAIL will contain 12 corresponding rows.
SYS_UNLOAD_DETAIL is visible to all users. Superusers can see all rows; regular users can see only their own data. For more information, see Visibility of data in system tables and views.
Table columns
| Column name | Data type | Description |
|---|---|---|
| user_id | integer | The identifier of the user who generated the entry. |
| query_id | integer | The query identifier of the UNLOAD command. |
| session_id | integer | The ID of the process associated with the query statement. |
| transaction_id | bigint | The ID of the transaction associated with the query statement. |
| file_name | character (1280) | The complete Amazon S3 object path for the file. |
| start_time | timestamp | The time when the transaction began. |
| end_time | timestamp | The time when the transaction completed. |
| line_count | bigint | The number of lines (rows) unloaded to the file. |
| transfer_size | bigint | The number of bytes transferred. |
| file_format | character (10) | The file format of the unloaded files. |
Sample queries
The following query shows the unloaded query details, including format, rows, and file count of unload command.
select query_id, substring(file_name, 0, 50), transfer_size, file_format from sys_unload_detail;Sample output.
query_id | substring | transfer_size | file_format ----------+-------------------------------------------------------------+---------------+------------- 9272 | s3://amzn-s3-demo-bucket/my_unload_doc_venue0000_part_00.gz | 395886 | Text 9272 | s3://amzn-s3-demo-bucket/my_unload_doc_venue0001_part_00.gz | 406444 | Text 9272 | s3://amzn-s3-demo-bucket/my_unload_doc_venue0002_part_00.gz | 409431 | Text 9272 | s3://amzn-s3-demo-bucket/my_unload_doc_venue0003_part_00.gz | 403051 | Text 9272 | s3://amzn-s3-demo-bucket/my_unload_doc_venue0004_part_00.gz | 413592 | Text 9272 | s3://amzn-s3-demo-bucket/my_unload_doc_venue0005_part_00.gz | 395689 | Text (6 rows)
