STL_SORT

Displays sort execution steps for queries, such as steps that use ORDER BY processing.

This view 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.
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 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.
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)