STL_WINDOW
Analyzes query steps that execute window functions.
This table 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 |
|---|---|---|
| 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 executed. |
| starttime | timestamp | Time in UTC that the query started executing, 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 executing, 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 execute the step. |
| rows | bigint | Total number of rows that were processed. |
| is_diskbased | character(1) | If true (t), the query was executed as a disk-based operation. If false (f), the query was executed in memory. |
| workmem | bigint | Total number of bytes in working memory that were assigned to the step. |
Sample Queries
The following example returns window function results for slice 0 and segment 3.
select query, tasknum, rows, is_diskbased, workmem from stl_window where slice=0 and segment=3;
query | tasknum | rows | is_diskbased | workmem -------+---------+------+--------------+---------- 86326 | 36 | 1857 | f | 95256616 705 | 15 | 1857 | f | 95256616 86399 | 27 | 1857 | f | 95256616 649 | 10 | 0 | f | 95256616 (4 rows)
