| title | description | author | ms.author | ms.date | ms.service | ms.subservice | ms.topic | dev_langs | monikerRange | |
|---|---|---|---|---|---|---|---|---|---|---|
sys.dm_pdw_dms_external_work (Transact-SQL) |
sys.dm_pdw_dms_external_work (Transact-SQL) |
WilliamDAssafMSFT |
wiassaf |
03/06/2017 |
sql |
data-warehouse |
reference |
|
>=aps-pdw-2016||=azure-sqldw-latest |
[!INCLUDEapplies-to-version/asa-pdw]
[!INCLUDEssazuresynapse-md] system view that holds information about all Data Movement Service (DMS) steps for external operations.
Note
[!INCLUDEsynapse-analytics-od-unsupported-syntax]
| Column Name | Data Type | Description | Range |
|---|---|---|---|
| request_id | nvarchar(32) | Query that is using this DMS worker. request_id, step_index, and dms_step_index form the key for this view. |
Same as request_id in sys.dm_pdw_exec_requests (Transact-SQL). |
| step_index | int | Query step that is invoking this DMS worker. request_id, step_index, and dms_step_index form the key for this view. |
Same as step_index in sys.dm_pdw_request_steps (Transact-SQL). |
| dms_step_index | int | Current step in the DMS plan. request_id, step_index, and dms_step_index form the key for this view. |
Same as dms___step_index in sys.dm_pdw_dms_workers (Transact-SQL). |
| pdw_node_id | int | Node that is running the DMS worker. | Same as node_id in sys.dm_pdw_nodes (Transact-SQL). |
| type | nvarchar(60) | Type of external operation this node is running. FILE SPLIT is an operation on an external Hadoop file that has been split into multiple smaller falls. |
'FILE SPLIT' |
| work_id | int | The file split ID. | Greater than or equal to 0. Unique per Compute node. |
| input_name | nvarchar(60) | String name for the input being read. | For a Hadoop file, this is the Hadoop file name. |
| read_location | bigint | Offset of read location. | |
| bytes_processed | bigint | Number of bytes processed by this worker. | Greater than or equal to 0. |
| length | bigint | Number of bytes in the file split. For Hadoop, this is the size of the HDFS block. |
User-defined. The default is 64 MB. |
| status | nvarchar(32) | State of the worker. | Pending, Processing, Done, Failed, Aborted |
| start_time | datetime | Time at which execution of this worker started. | Greater than or equal to start time of the query step this worker belongs to. See sys.dm_pdw_request_steps (Transact-SQL). |
| end_time | datetime | Time at which execution ended, failed, or was canceled. | NULL for ongoing or queued workers. Otherwise, greater than start_time. |
| total_elapsed_time | int | Total time spent in execution, in milliseconds. | Greater than or equal to 0. If total_elapsed_time exceeds the maximum value for an integer, total_elapsed_time will continue to be the maximum value. This condition will generate the warning "The maximum value has been exceeded." The maximum value in milliseconds is equivalent to 24.8 days. |
For information about the maximum rows retained by this view, see the Metadata section in the Capacity limits topic.