STL_SORT
Displays sort execution steps for queries, such as steps that use ORDER BY processing.
STL_SORT 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.
Note
STL_SORT only contains queries run on main provisioned clusters. It doesn't contain queries run on concurrency scaling clusters or on serverless namespaces. To access explain plans for queries run on both main clusters, concurrency scaling clusters, and serverless namespaces, we recommend that you use the SYS monitoring view SYS_QUERY_DETAIL . The data in the SYS monitoring view is formatted to be easier to use and understand.
Table columns
| Column name | Data type | Description |
|---|---|---|
| userid | integer | ID of the user who generated the entry. |
| query | integer | Query ID. The query column can be used to join other system tables and views. |
| slice | integer | Number that identifies the slice where the query was running. |
| segment | integer | Number that identifies the query segment. |
| step | integer | Query step that ran. |
| starttime | timestamp | Time in UTC that the query started. Total time includes queuing and execution. with 6 digits of precision for fractional seconds. For example: 2009-06-12 11:29:19.131358. |
| endtime | timestamp | Time in UTC that the query finished. Total time includes queuing and execution. with 6 digits of precision for fractional seconds. For example: 2009-06-12 11:29:19.131358. |
| tasknum | integer | Number of the query task process that was assigned to run the step. |
| rows | bigint | Total number of rows that were processed. |
| bytes | bigint | Size, in bytes, of all the output rows for the step. |
| tbl | integer | Table ID. |
| is_diskbased | character(1) | If true (t), the query was performed as a disk-based operation. If false (f), the query was performed in memory. |
| workmem | bigint | Total number of bytes in working memory that were assigned to the step. |
| checksum | bigint | This information is for internal use only. |
Sample queries
The following example returns sort results for slice 0 and segment 1.
select query, bytes, tbl, is_diskbased, workmem from stl_sort where slice=0 and segment=1;
query | bytes | tbl | is_diskbased | workmem -------+---------+-----+--------------+----------- 567 | 3126968 | 241 | f | 383385600 604 | 5292 | 242 | f | 383385600 675 | 104776 | 251 | f | 383385600 525 | 3126968 | 251 | f | 383385600 585 | 5068 | 241 | f | 383385600 630 | 204808 | 266 | f | 383385600 704 | 0 | 242 | f | 0 669 | 4606416 | 241 | f | 383385600 696 | 104776 | 241 | f | 383385600 651 | 4606416 | 254 | f | 383385600 632 | 0 | 256 | f | 0 599 | 396 | 241 | f | 383385600 86397 | 0 | 242 | f | 0 621 | 5292 | 241 | f | 383385600 86325 | 0 | 242 | f | 0 572 | 5068 | 242 | f | 383385600 645 | 204808 | 241 | f | 383385600 590 | 396 | 242 | f | 383385600 (18 rows)
