STL_WINDOW

Analyzes query steps that execute window functions.

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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)